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The American Society of Mechanical Engineers
A N A M E R I C A N N A T I O N A L S T A N D A R D
MAIHINE SCREWS AND MACHINE
SCREW NUTS
ASME B1 8.6.3-1 MM8 [Revision 01 ANSI B18.6.3-1972(R1997)]
COPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling ServicesCOPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling Services
STDmASME BLB.b.3-ENGL L998 m 0759b70 ObL4Lb4 T39 W
Date of Issuance: November 30, 1999
The 1998 edition of this Standard is being issued with an automatic addenda subscription service. The use of an addenda allows revisions made in response to public review comments or committee actions to be published as necessary. The next edition of this Standard is scheduled for publication in 2004.
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This code or standard was developed under procedures accredited as meeting the criteria for American National Standards. The Standards Committee that approved the code or standard was balanced to assure that individuals from competent and concerned interests have had an opportunity to participate. The proposed code or standard was made available for public review and comment, which provides an opportunity for additional public input from industry, academia, regulaton/ agencies, and the public-at-large.
ASME does not "approve," "rate," or "endorse" any item, construction, proprietary device, or activity.
ASME does not take any position with respect to the validity of any patent rights asserted in connection with any items mentioned in this document, and does not undertaketo insure anyone utilizing a standard against liability for infringement of any applicable Letters Patent, nor assume any such liability. Users of a code or standard are expressly advised that determination of the validity of any such patent rights, and the risk of infringement of such rights, is entirely their own responsibility.
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without the prior written permission of the publisher.
The American Society of Mechanical Engineers Three Park Avenue, New York, NY 10016-5990
Copyright O 1999 by THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS
All Rights Reserved Printed in U.S.A.
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STDOASME BLB.b.3-ENGL L998 m 0757670 ObL4Lb5 975 m
FOREWORD
American National Standards Committee B 18 for the standardization of bolts, screws, nuts, rivets, and similar fasteners was organized in March 1922, as Sectional Committee B18 under the aegis of the American Engineering Standards Committee (later the American Standards Association, then the United States of America Standards Institute and, as of October 6, 1969, the American National Standards Institute, Inc.), with the Society of Automotive Engineers and the American Society of Mechanical Engineers as joint sponsors. Subcommittee 3 ' was subsequently established and charged with the responsibility for technical content of standards covering slotted and recessed head screws.
An American Standard setting forth slotted head proportions was approved and published in April of 1930. Over the years following the Issuance of this document, the need for standards more comprehensive than head configurations became apparent. At a meeting held on April 14, 1942, Subcommittee 3' was reorganized and enlarged, and the following operating scope was established:
The scope of Subcommittee 3' shall consist of the development and promulgation of American Standards embracing screw products variously known as machine screws, wood screws, tapping screws, slotted head cap screws, slotted headless set screws, and machine screw nuts. The standards shall comprise complete product standards covering all dimensions and tolerances required for the specification and production of the products. Details shall include boundary dimensions, such as nut width and thickness; screw head dimensions; slot and recess dimensions; body dimensions; thread classification or thread detail, as required; thread length; point design; chamfers; underhead fillets; and supporting general specifications covering the quality, finish, and the acceptable tolerances and limits as well as any information that may be necessrtry to insure satisfactory application of the products.
Several meetings of the Subcommittee over the ensuing 3 years resulted in the development and acceptance of a proposed revision containing complete product standards coverage for slotted and recessed head machine, tapping and wood screws; slotted head and hexagon head cap screws; and slotted headless set screws. Following approval by the B18 Committee and sponsor organizations, this proposal was forwarded to the American Standards Association and declared an American Standard, ASA B 18.6, on April 12, 1947.
Recognizing the need for further refinements, Subcommittee 3' at a meeting held on February I , 1951, established three standing working subgroups: one to develop details pertinent to tapping screw threads; a second to review, revise, and develop head dimensions and tolerances; and a third to correlate and edit the technical information emanating from the other two groups. Also at this meeting, numerous suggested changes were reviewed and assigned to the respective subgroups for further development. Additional meetings of the Subcommittee were held on October 9, 1952, October 29, 1953, and April 1 and 2, 1954. Between each of these meetings the subgroups held numerous working sessions and carried on technical development in cooperation with the technical committees of the U.S. Machine Screw and Tapping Screw Service Bureaus.
' As of April I , 1966, subcommittee 3 was redesignated Subcommittee 6.
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At the April 1954 meeting, Subcommittee 3,' contemplating a partial revision of the ASA BI 8.6 document, recommended the publication of standards for wood screws, cap and set screws, machine screws, and tapping and drive screws in four separate documents, each of which would consist of a complete product specification. This approach was confirmed by the B I 8 Committee with the further stipulation that the coverage for hexagon head cap screws, square head set screws, and machine screw nuts from the ASA B 18.2 standard be transferred to the documents covering cap and set screws and machine screws, respectively. I t was understood that jurisdiction over the square head set screws and hexagon head cap screws would remain with Subcommittee 2 and that Subcommittee 3' would retain responsibility for machine screw nuts. Following this confirmation and additional direction, the preparation of proposals for the new documents was undertaken.
The proposed standard covering slotted and recessed head machine screws and machine screw nuts was approved by Subcommittee 3' at a meeting held on December 6, 1955. After being circulated to industry for comment, it was revised and subsequently approved by letter ballot of the B 18 Committee in March of 1958. The proposal was, however, redrafted to incorporate additional revisions and refinements adopted by Subcommittee 3' at meetings held on October 30, 1958 and September 17, 1959. The revised proposal was recirculated to the B I 8 Committee and was approved by the sponsor organizations and the American Standards Association and formally designated an American Standard, ASA B 18.6.3, on February 12, 1962.
Following issuance of the 1962 document, Subcommittee 3' and the working subgroups continued to develop revisions and refinements reflecting changes in industry practices and technical improvements. Work over the intervening years culminated in the Subcommittee 6 acceptance of a draft dated November 1969, incorporating revisions in the following areas: inclusion of Type IA cross recess data; addition of the No. o o 0 0 , 000, and O0 sizes to most slotted head styles; extensions of size coverage for 1 0 0 deg flat countersunk heads and binding heads in smaller sizes, and for pan heads in larger sizes; redimensioning of flat and oval countersunk heads; revision of thread lengths; inclusion of appendices for wobble gaging of recessed heads and wrench sizes for square and hex products; and a complete revamping of the format.
In 1997 Subcommittee 6 initiated work to revise the head diameters for flat head screws, the length measurement method for oval head screws, the height inspection for oval head screws, adding protrusion height inspection for oval head screws and quality assurance and designated inspection characteristics. Several drafts were prepared, which resulted in further refinements. These changes were balloted and approved by the ASME BI8 Committee.
This revision was approved as an American National Standard on July 16, 1998.
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CORRESPONDENCE WITH THE B18 COMMITTEE
General. ASME Standards are developed and maintained with the intent to represent the consensus of concerned interests. As such, users of this Standard may interact with the Committee by requesting interpretations, proposing revisions, and attending Committee meetings. Correspondence should be addressed to:
Secretary, B 18 Main Committee The American Society of Mechanical Engineers Three Park Avenue New York, NY 10016-5990
Proposing Revisions. Revisions are made periodically to the Standard to incorporate changes that appear necessary or desirable, as demonstrated by the experience gained from the application of the Standard. Approved revisions will be published periodically.
The Committee welcomes proposals for revisions to this Standard. Such proposals should be as specific as possible, citing the paragraph number(s), the proposed wording, and a detailed description of the reasons for the proposal, including any pertinent documentation.
Interpretations. Upon request, the B 18 Committee will render an interpretation of any requirement of the Standard. Interpretations can only be rendered in response to a written request sent to the Secretary of the B I 8 Main Committee.
The request for interpretation should be clear and unambiguous. It is further recommended that the inquirer submit hisher request in the following format:
Subject: Cite the applicable paragraph number(s) and the topic of the inquiry. Edition: Cite the applicable edition of the Standard for which the interpretation
is being requested. Question: Phrase the question as a request for an interpretation of a specific
requirement suitable for general understanding and use, not as a request for an approval of a proprietary design or situation. The inquirer may also include any plans or drawings, which are necessary to explain the question; however, they should not contain proprietary names or information.
Requests that are not in this format may be rewritten in the appropriate format by the Committce prior to being answered, which may inadvertently change the intent of the original request.
ASME procedures provide for reconsideration of any interpretation when or if additional information that might affect an interpretation is available. Further, persons aggrieved by an intcrpretation may appeal to the cognizant ASME Committee or Subcommittee. ASME does not “approve,” “certify,” “rate,” or “endorse” any item, construction, proprietary device, or activity.
Attending Committee Meetings. The B18 Main Committee regularly holds meetings, which are open to the public. Persons wishing to attend any meeting should contact the Secretary of the B 18 Main Committee.
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ASME B18 STANDARDS COMMITTEE Standardization of Bolts, Nuts, Rivets, Screws,
Washers, and Similar Fasteners
(The following is the roster of the Committee at the time of approval of this Standard.)
OFFICERS
D. A. Clever, Chair R. D. Strong, Vice Chair S. W. Vas , Vice Chair R. L. Crane, Secretary
COMMITTEE PERSONNEL
J. C. Akins, Safety Socket Screw Corp. J. Altman, Rotor Clip Co. J. B. Belford, Lawson Products Inc. D. Broornfield, Illinois Tool Works Inc. J. A. Buda, SPS Technologies D. A. Clever, Deere and Co. A. P. Cockrnan, Ford Motor Co. T. Collier, Cam-Tech Industries Inc. R. L. Crane, The American Society of Mechanical Engineers A. C. DiCola, Wrought Washer Co. A. Dinh, Defense Industrial Supply Center W. D, Downing, Emhart Heli-Coil D. L. Drobnich, Alternate, Ford Motor Co. B. A. Dusina, Federal Screw Works D. S. George, Ford Motor Co. B. Hasiuk, Defense Industrial Supply Center A. Herskovitz, U. S. Army ARDEC A. C. Hood, ACH Technologies J. Hubbard, Rockford Fastener, Inc. F. W. Kern, Consultant W. H. Kopke, ITW Shakeproof Assembly Corp. J. G. Langenstein, Consultant M. Levinson, ITW Shakeproof L. L. Lord, Caterpillar Inc. A. D. McCrindle, Genfast Manufacturing Co. K. E. McCullough, Consultant R. F. Novotny, Camcar Decorah Operations M. D. Prasad, General Motors Corp. W. Schevey, EGM Fastener Co. Inc. J. H. Slass, Alternate, Rotor Clip R. D. Strong, General Motors Corp. J. F. Sullivan, National Fasteners Distribution Association R. L. Tennis, Caterpillar Inc. S. W. Vass, Industrial Fasteners Institute R. G. Weber, Fairfield University School of Engineering C. J. Wilson, Industrial Fasteners Institute
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SUBCOMMITTEE 6 - SLOTTED AND RECESSED HEAD SCREWS
R. D. Strong, Chair, General Motors Corp. R. L. Crane, Secretary, The American Society of Mechanical Engineers D. Broomfield, Illinois Tool Works Inc. D. A. Clever, Deere and Co. A. Dinh, Defense Industrial Supply Center J. Greenslade, Greenslade and Co. A. Herskovitz, U.S. Army ARDEC M. W. Holubecki, Electric Boat Corp. J. Hubbard, Rockford Fastener, Inc. R. W, Kerr, Kerr Lakeside Inc. R. F. Novotny, Camcar Decorah Operations J. A. Schlink, Caterpillar Inc. J. F. Sullivan, National Fasteners Distribution Association C. B. Wackrow, MNP Corp. C. J. Wilson, Industrial Fasteners Institute
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CONTENTS
Foreword . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Correspondence With the B 18 Committee . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1 Introductory Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2 General Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Tables I A Dimensions of Slotted Flat Countersunk Head Machine Screws . . . . . . . . . . . . . . . . . . IB Dimensions of Type I Cross Recessed Flat Countersunk Head Machine
IC Dimensions of Type IA Cross Recessed Flat Countersunk Head Machine
ID Dimensions of Type 11 Cross Recessed Flat Countersunk Head Machine Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2A Dimensions of Slotted 100 deg Flat Countersunk Head Machine Screws . . . . . . . . . . 2B Dimensions of Type I Cross Recessed 100 deg Flat Countersunk Head Machine
Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2C Dimensions of Type I A Cross Recessed 1 0 0 deg Flat Countersunk Head Machine
Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2D Dimensions of Type II Cross Recessed 100 deg Flat Countersunk Head Machine
3A Dimensions of Slotted Close Tolerance 1 0 0 deg Flat Countersunk Head Machine Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3B Dimensions of Type I Cross Recessed Close Tolerance 100 deg Flat Countersunk Head Machine Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3C Dimensions of Type I A Cross Recessed Close Tolerance 100 deg Flat Countersunk Head Machine Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3D Dimensions of Type II Cross Recessed Close Tolerance 100 deg Flat Countersunk Head Machine Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4A Dimensions of Slotted Oval Countersunk Head Machine Screws . . . . . . . . . . . . . . . . . . 4B Dimensions of Type I Cross Recessed Oval Countersunk Head Machine
4C Dimensions of Type I A Cross Recessed Oval Countersunk Head Machine
4D Dimensions of Type II Cross Recessed Oval Countersunk Head Machine Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5A Dimensions of Slotted Undercut Flat Countersunk Head Machine Screws . . . . . . . . . 5B Dimensions of Type I Cross Recessed Undercut Flat Countersunk Head Machine
Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5C Dimensions of Type I A Cross Recessed Undercut Flat Countersunk Head Machine
Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Standards Committee Roster . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Screws
Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
... 111
V
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I
3
7
8
10
I I 12
13
14
15
16
17
18
19 20
22
24
26 28
29
30
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SD
6A 6B
6C
6D
7A
7B
7 c
8A
SB
8C
9A 9B 9 c 9D I 0A I OB I oc 1 OD 1 1 12A 12B 12c I2D 13A 13B 13C 13D 14
15 16 17
Dimensions of Type II Cross Recessed Undercut Flat Countersunk Head Machine Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Dimensions of Slotted Undercut Oval Countersunk Head Machine Screws . . . . . . . . 32
Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 Dimensions of Type I Cross Recessed Undercut Oval Countersunk Head Machine
Dimensions of Type IA Cross Recessed Undercut Oval Countersunk Head Machine Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Dimensions of Type II Cross Recessed Undercut Oval Countersunk Head Machine Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Dimensions of Type I Cross Recessed Flat Countersunk Trim Head Machine Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Dimensions of Type IA Cross Recessed Flat Countersunk Trim Head Machine Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Dimensions of Type II Cross Recessed Flat Countersunk Trim Head Machine Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Dimensions of Type I Cross Recessed Oval Countersunk Trim Head Machine Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Dimensions of Type IA Cross Recessed Oval Countersunk Trim Head Machine Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
Dimensions of Type II Cross Recessed Oval Countersunk Trim Head Machine Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Dimensions of Slotted Pan Head Machine Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48 Dimensions of Type I Cross Recessed Pan Head Machine Screws . . . . . . . . . . . . . . . . 49 Dimensions of Type IA Cross Recessed Pan Head Machine Screws . . . . . . . . . . . . . . 50 Dimensions of Type II Cross Recessed Pan Head Machine Screws . . . . . . . . . . . . . . . 51
Dimensions of Type I Cross Recessed Fillister Head Machine Screws . . . . . . . . . . . . 53 Dimensions of Type IA Cross Recessed Fillister Head Machine Screws . . . . . . . . . . 54 Dimensions of Type 11 Cross Recessed Fillister Head Machine Screws . . . . . . . . . . . 56 Dimensions of Slotted Drilled Fillister Head Machine Screws .................... 57 Dimensions of Slotted Truss Head Machine Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58 Dimensions of Type I Cross Recessed Truss Head Machine Screws . . . . . . . . . . . . . . 59 Dimensions of Type IA Cross Recessed Truss Head Machine Screws . . . . . . . . . . . . 60 Dimensions of Type II Cross Recessed Truss Head Machine Screws . . . . . . . . . . . . . 61
Dimensions of Type I Cross Recessed Binding Head Machine Screws . . . . . . . . . . . . 63 Dimensions of Type IA Cross Recessed Binding Head Machine Screws . . . . . . . . . . 64 Dimensions of Type II Cross Recessed Binding Head Machine Screws . . . . . . . . . . . 6.5 Dimensions of Plain and Slotted Regular and Large Hex Head Machine
Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66 Dimensions of Plain and Slotted Hex Washer Head Machine Screws . . . . . . . . . . . . . 68 Dimensions of Square and Hex Machine Screw Nuts . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70 Dimensions of Header Points for Machine Screws Before Threading . . . . . . . . . . . . . 71
Dimensions of Slotted Fillister Head Machine Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
Dimensions of Slotted Binding Head Machine Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
Mandatory Appendices
2 Across-Corners Gaging of' Hex Heads . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
4 Wobble Gaging of Recessed Heads . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . SS 5 Dimensions for No . 0000, No . 000, and No . 00 Thread Sizes . . . . . . . . . . . . . . . . . . . 89
I Protrusion Gaging of Flat Countersunk Heads . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
3 Penetration Gaging of Recessed Heads . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77
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STDOASME BLB.b.3-ENGL 3798 0759b70 Ob34372 005 m
Nonmandatory Appendices A Formulas for Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91 B Wrench Openings for Hex Head Screws and Square and Hex Nuts . . . . . . . . . . . . . . 99 C Dimensions of Round Head Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101
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ASME 818.6.3-1998
MACHINE SCREWS AND MACHINE SCREW NUTS
1 INTRODUCTORY NOTES
1.1 Scope
This Standard is intended to cover the complete general and dimensional data for the various types of slotted and recessed head machine screws and machine screw nuts recognized as American National Standard. Also included are appendices that provide specifications and instructions for the protrusion gaging of flat count- ersunk head screws; across-comers gaging of hex head screws; penetration gaging and wobble gaging of re- cessed head screws; wrench openings for hex and square products; thread dimensions for the No. 0000, No. 000, and No. O0 sizes; and formulas on which dimensional data are based. It shall be understood, however, that where questions arise concerning acceptance of product, the dimensions in the tables shall govern over recalcula- tion by formula.
The inclusion of dimensional data in this Standard is not intended to imply that all of the products described are stock production sizes. Consumers should consult with manufacturers concerning the availability of products.
1.2 Machine Screw Head Types
The head types covered by this Standard include those commonly recognized as being applicable to machine screws and are enumerated and described in the following paragraphs.
1.2.1 Flat Countersunk Head. The flat count- ersunk head shall have a flat top surface and a conical bearing surface with a head angle for one style of approximately 82 deg and for another style of approxi- mately 1 0 0 deg. Dimensions are given in Tables IA through ID, and 2A through 2D, respectively. Dimen- sions of close tolerance 100 deg flat countersunk heads are given in Tables 3A through 3D.
1.2.2 Oval Countersunk Head. The oval count- ersunk head shall have a rounded top surface and a conical bearing surface with a head angle of approxi- mately 82 deg. Dimensions are given in Tables 4A through 4D.
1
1.2.3 Undercut Flat and Oval Countersunk Heads. For short lengths, 82 deg flat and oval count- ersunk head machine screws shall have heads undercut to 70% of normal side height to afford greater length of thread on the screws. Dimensions are given in Tables 5A through 5D, and 6A through 6D, respectively.
1.2.4 Flat and Oval Countersunk Trim Heads. Flat and oval countersunk trim heads shall be similar to the 82 deg flat and oval countersunk heads except that the size of head for a given size screw is one or two sizes smaller than the regular flat and oval count- ersunk head size, and oval countersunk trim heads shall have a controlled radius where the curved top surface meets the conical bearing surface. Trim heads are furnished only in cross recessed head types. Dimensions are given in Tables 7A through 7C, and 8A through 8C, respectively.
1.2.5 Pan Head. The slotted pan head shall have a flat top surface rounded into cylindrical sides and a flat bearing surface. The recessed pan head shall have a rounded top surface blending into cylindrical sides and a flat bearing surface. Dimensions are given in Tables 9A through 9D.
1.2.6 Fillister Head. The fillister head shall have a rounded top surface, cylindrical sides, and a flat bearing surface. Dimensions are given in Tables 10A through IOD. Dimensions of drilled fillister head ma- chine screws are given in Table l l .
1.2.7 Truss Head. The truss head shall have a low rounded top surface with a flat bearing surface, the diameter of which for a given screw size shall be larger than the diameter of the corresponding round head. Dimensions are given in Tables 12A through 12D.
1.2.8 Binding Head. The binding head shall have a rounded top surface and slightly tapered sides. The bearing surface shall be flat and, where so specified by purchaser, slotted heads shall have an annular under- cut adjacent to the shank. Dimensions are given in Tables 13A through I3D.
COPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling ServicesCOPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling Services
STD-ASME BLB-b-3-ENGL 1998
ASME 818.6.3-1998
D 0759b70 Ob14174
MACHINE SCREWS AND MACHINE SCREW NUTS
1.2.9 Hex Head. The hex head shall have a flat 1.7 Terminology or indented top surface, six flat sides, and a flat bearing surface. Dimensions for regular and large heads are given in Table 14.
For definitions of terms relating to fasteners or fea- tures thereof used in this Standard, refer to ASME B 18.12, Glossary of Terms for Mechanical Fasteners.
1.2.10 Hex Washer Head. The hex washer head shall have an indented top surface and six flat sides 1-8 Related Standards formed integrally with a flat washer that projects beyond It should be noted that standards for cap screws, set the sides and provides a flat bearing surface. Dimensions screws, tapping screws, wood screws, drive screws, are given in Table 15. sems, washers, and other related fasteners are published
under separate cover as listed at the end of this Standard. 1.2.11 Round Head. The round head shall have
a semielliptical top surface and a flat bearing surface. In recognition of superior slot driving characteristics 1.9 Comparison With IS0
of pan head screws over round head screws, and the This Standard has no IS0 counterpart. overlap in the dimensions of cross recessed pan heads and round heads, it is recommended that pan head screws be used in new designs and wherever possible l. 1 O References
substituted in existing designs. To expedite elimination The following is a list of publications referenced in of the necessity for perpetuating stocks of finished this Standard. products and tooling, it should be recognized that during the transition period manufacturers may, when it is ASME B 1.1, Unified Inch Screw Threads (UN and agreeable to users, substitute pan head where round head is specified. Dimensions are given for reference ASME B18.12, Of Tenns for purposes in Appendix C.
UNR Thread Form)
Fasteners
for General Purpose Fasteners
for High-Volume Machine Assembly Fasteners
ASME B 18.18. IM, Inspection and Quality Assurance
1.3 Machine Screw Nuts ASME B 18.18.2M, Inspection and Quality Assurance
The machine screw nuts covered by this Standard ASME B 18.24.1, Part Identifying Number (Pin) Code include the hexagon and square varieties. Dimensions System Standard for B 18 Externally Threaded are given in Table 16. Products
ASME B18.24.2, Part Identifying Number (Pin) Code System Standard for B18 Internally Threaded Products
All dimensions i n this Standard are given in inches, publisher: The ~~~~i~~~ Society of Mechanical Engi- unless stated otherwise. neers (ASME International), Three Park Avenue,
New York, NY 10016-5990; Order Department: 22 Law Drive, Box 2300, Fairfield, NJ 07007-2300.
Unless otherwise specified at the time the order is Options7 where 'Pecified7 be at the placed, the latest level of all reference standards shall
of the manufacturer unless otherwise agreed upon by be used. the manufacturer and the purchaser. ANSI and IS0 standards may be obtained from
ANSI, the American National Standards Institute, 1 I
1.4 Dimensions
1.5 Options
1.6 Responsibility for Modification West 42nd Street, New York, NY 10036-8002. ASTM standards may be obtained from the American
The manufacturer shall not be held responsible for Society for Testing and Materials, 100 Barr Harbor malfunctions of product determined to be due to plating Drive, West Conshohocken, PA 19428-2959. or other modifications when such plating or modification SAE standards may be obtained from the Society of is not accomplished under the manufacturer's control Automotive Engineers, Inc. 400 Commonwealth Drive, or direction. Warrendale, PA 15096-OO01.
2
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MACHINE SCREWS ANO MACHINE SCREW NUTS
1.11 Inspection and Quality Assurance
Unless otherwise specified, acceptability to this Stan- dard shall be determined i n accordance with ASME B 18.18. I M, Inspection and Quality Assurance for Gen- eral Purpose Fasteners.
When applicable, the following designated character- istics shall be inspected to the inspection levels shown according to ASME B 18.1 8.2M, Inspection and Quality Assurance for High-Volume Machine Assembly Fasten- ers, and shall be within their specified limits.
Designated Characteristic Inspection Level
Recess penetration depth C Slot depth C Width across corncrs C Thread acceptance C Tensile strength test C Nut proof load test C
If verifiable in-process inspection is used, inspection sample sizes and reporting shall be in accordance with the applicable ASME, ASTM, or SAE quality system consensus standard.
For nondesignated dimensional characteristics, the provisions of ASME B 18.18. IM shall apply. Should a nondesignated dimension be determined to be outside its specified limits, it shall be deemed conforming to this Standard if the user who is the installer accepts the dimension, based upon form, fit, and function considerations.
2 GENERAL DATA
2.1 Heads
2.1.1 Head Height. All dimensions pertaining to head height specified in the dimensional tables shall be measured parallel to the axis of screw and those relating to the top of head shall represent a metal-to- metal measurement. In other words, any truncation of rounded head contours due to the slot or recess shall not be considered part of the head height.
Total or overall head heights shall be measured from the top of the head to the plane of the bearing surface for flat bearing surface type heads, to the plane of the undercut for undercut countersunk heads, and to the junction of the conical bearing surface with the basic screw diameter for countersunk heads.
Head side heights shall be measured from the theoreti- cal intersection of the top surface of head with the head diameter to the plane of the bearing surface for flat bearing surface type heads, to the plane of the
ASME 818.6.3-1998
undercut for undercut countersunk heads, and to the junction of the conical bearing surface with the basic screw diameter for countersunk heads.
On countersunk heads, the junction of the conical bearing surface with the basic screw diameter may not necessarily be the same as the actual junction of head with shank and the head height delineating the conical bearing surface is a reference dimension.
2.1.2 Bearing Surface. The bearing surface of flat bearing surface type machine screw heads shall be perpendicular to the axis of the screw shanks within 2 deg.
2.1.3 Depth of Recess. The depth of recess in recessed head screws shall be measured, parallel to the axis of screw, from the intersection of the maximum diameter of the recess with the head surface to the bottom of the recess.
Recess penetration gaging depth values are included in the respective dimensional tables, and the method of gaging and specifications for gages are contained in Appendix III .
Recess wobble gages, gaging procedures, and permis- sible limits are given in Appendix IV.
2.1.4 Depth of Slot. The depth of slot in slotted head screws shall be measured, parallel to the axis of screw, from the top of the head to the intersection of the bottom of the slot with the head surface or bearing surface.
2.1.5 Feature Positional Tolerances. The posi- tional relationship of the heads and driving provisions of screws with respect to the shanks of screws (formerly defined as eccentricity) shall be as follows.
(a) True Position of Head. The axis of the head shall be located at true position relative to the axis of the screw shank within a tolerance zone having a diameter equivalent to 6% of the specified maximum head diameter, or maximum width across flats of hex and hex washer heads, regardless of feature size.
(b) True Position of Recess. The recess in cross recessed head screws shall be located at true position relative to the axis of the screw shank within a tolerance zone having a diameter equivalent to 12% of the basic screw diameter or 0.030 in., whichever is greater, regardless of feature size.
3
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STDOASME BLB.b.3-ENGL
ASME B18.6.3-1998
(c) True Position of Slot. The slot in slotted head screws shall be located at true position relative to the axis of the screw shank within a tolerance zone having a diameter equivalent to 12% of the basic screw diameter or 0.020 in. , whichever is greater.
2.1.6 Underhead Fillets. Machine screws shall have a definite underhead fillet large enough to ensure that full fastener strength is achieved. The radius of the fillct under countersunk head screws shall be no greater than 40% of the basic screw diameter. The radius of the fillet under truss heads and number 6 sized pan heads shall be no greater than 25% of the basic screw diameter. The radius of the fillet under all other head styles shall be no greater than 15% of the basic screw diameter.
2.2 Length
2.2.1 Measurement. The nominal length of screw L shall be measured, parallel to the axis of screw, from the extreme point to the plane of the bearing surface for screws having perpendicular bearing surface type heads, and to the theoretical intersection of the top surface of head with the head diameter for screws having countersunk type heads. For all oval heads, the overall length L, shall be measured, parallel to the axis of the screw, from the extreme point to the top of the head, where
L , = L + c
L998
MACHINE SCREWS AND MACHINE SCREW NUTS
sizes, which are covered in Appendix V, shall be Unified Standard, Class 2A, UNC and UNF series, or UNRC and UNRF series, at option of manufacturer, in accordance with ASME B I . l . For threads with additive finish, the maximum diameters of Class 2A may be exceeded by the amount of the allowance: that is, the Class 2A maximum diameters shall apply to an unplated or uncoated part, or to a part before plating or coating, whereas the basic diameters (Class 3A GO) shall apply to a part after plating or coating. The minimum major diameter of plated or coated screws may approach but shall not be less than the Class 2A minimum limit.
2.3.2 Machine Screw Nuts. Threads shall be Unified Standard, Class 2B, UNC or UNF series for hexagon machine screw nuts, and UNC series for square machine screw nuts, in accordance with ASME B 1 . l .
2.4 Length of Thread
2.4.1 Machine Screws. Machine screws shall have thread lengths conforming to the following (on screws threaded full length, the distance to first full form thread shall be measured, parallel to the axis of screw, from the bearing surface of the head to the face of a nonchamfered or noncounterbored standard 3A GO thread ring gage assembled by hand as far as the thread will permit).
2.2.2 Tolerance on Length. The length tolerance shall apply to L , for all oval heads and to L for all other head styles. The tolerance on the length of machine screws shall conform to the following for the respective screw types:
( a ) Sizes No. 5 and Smaller. Screws of nominal lengths equal to three diameters and shorter shall have full form threads extending to within one pitch (thread) of the bearing surface of the head, or closer, if practica- ble. Nominal lengths greater than three diameters, up to and including IV8 in., shall have fu l l form threads
Tolerance on Length extending to within two pitches (threads) of the bearing for Nominal Screw Size
Nominal m 0 94
Screw Through Through Through Lengrh O0 12 v4
up to '/z in., incl. -0.0 I -0.02 -0.03 Over '12 IO I in., inci. -0.02 -0.03 -0.03 Over I to 2 in.. incl. . . . -0.06 -0.06 Over 2 in. . . . -0.09 -0.09
2.3 Threads
2.3.1 Machine Screws. The threads on machine screws, except for the No. 0000, No. 000, and No. 00
surface of the head, or closer, if practicable. Screws of longer nominal lengths shall, unless otherwise specified, have a minimum length of full form thread of I in.
(b) Sizes No. 6 and Larger. Screws of nominal lengths equal to three diameters and shorter shall have full form threads extending to within one pitch (thread) of the bearing surface of the head, or closer, if practica- ble. Nominal lengths greater than three diameters, up to and including 2 in., shall have ful l form threads extending to within two pitches (threads) of the bearing surface of the head, or closer, if practicable. Screws of longer nominal lengths shall, unless otherwise specified, have a minimum length of ful l form thread of 1.50 in.
4
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MACHINE SCREWS AND MACHINE SCREW NUTS
2.5 Points
Unless otherwise specified, machine screws shall have plain sheared ends. Where so specified, header points shall be as shown in Table 17. Other points or pointing of longer lengths to header point dimensions may require machining.
2.6 Diameter of Body
2.6.1 Machine Screws. The diameter of body on machine screws having other than trim heads shall not be less than the Class 2A thread minimum pitch diameter nor greater than the basic major diameter of the thread.
2.6.2 Trim Head Machine Screws. The diameter of body on trim head machine screws shall not be less than the Class 2A thread minimum pitch diameter nor greater than the basic major diameter of the thread. Screws not threaded to the head shall have a 0.062 in. minimum length shoulder under the head with diameter limits as specified in the dimensional tables.
2.7 Material
2.7.1 Machine Screws. Unless otherwise speci- fied, machine screws shall be fabricated From carbon steel and shall have a minimum tensile strength of 60,000 psi.
Machine screws. where so specified, may also be made from higher strength steels, corrosion resistant steel, brass, monel, aluminum alloys, or other materials, as agreed upon between the manufacturer and the purchaser.
2.7.2 Machine Screw Nuts. Machine screw nuts are normally supplied in steel, corrosion resistant steel, or brass as specified by the purchaser. Unless otherwise specified, no physical requirements shall apply.
2.8 Finish
Unless otherwise specified, machine screws and ma- chine screw nuts shall be supplied with a natural (as processed) finish, unplated or uncoated.
ASME 618.6.3-1998
2.9 Workmanship
Machine screws and machine screw nuts shall not contain an excess of surface imperfections that might affect their serviceability, such as, burrs, seams, laps, loose scale, and other irregularities.
2.10 Designation
2.10.1 Machine Screws. Machine screws shall be designated by the following data in the sequence shown: nominal size (number, fraction, or decimal equivalent); threads per inch; nominal length (fraction or decimal equivalent); product name, including head type and driving provision; header point, if desired; material; protective finish, i f required; or, optionally, ASME B1 8.24. I PIN code. For example:
EXAMPLE I : 1/4 - 20 x 1-1/4 Slotted Pan Head Machine Scrcw. Steel, Zinc Plated
" i'
I
530N A99 C A ""
.D19 155NN CE + 4 + "-
1~" Plating, coating, and passiv- ation: electrodeposited coat- ings of zinc on irnn and steel, type I I , SC 1
L Material and treatment: equiva- lent to PIN 001 through 15.3
-Diameter and length: 0.250 and 1.250
L T h r e a d series: thread forming. thread cut- ting, and metallic drive
1 1 ._ Head and drive: screws, machine, pan head,
i B I8 standard designation: B 18.6.3 slvtted
- Fastener family: screw
EXAMPLE 2: 16 - 32 x 3/1 Type IA Cross Recessed Filli\kr Head Machine Screw, Brasa
S 630N A60 C A614 603NN AA
Unplated, uncoated IL UNS 46200
__ 0.138 and 0.750
Screws, machine, fillister head, type I A cross recess
818.6.3 - Screw
5
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ASME 818.6.3-1998
EXAMPLE 3: 3 7 5 - 16 x 1.50 Hexagon Washer Head Machine Screw. Header Poinled, Steel
S 630N AX1 C AK21 l55NN AA 4 A A 4 r 4
~
Unplated, uncoated i ~~ Equivalent to PIN 001 through 153
0.375 and 1.500
L UNC ~ ~ Screws, machine, hex washer head, unslotted
818.6.3 ~ Screw
EXAMPLE 1: . I O 0 - 24 x 1 S O Type II Cross Recessed Flat Count- ersunk Head Machine Screw. Steel. Nickel Plated
"" S 630N A65 C AA21 302NN RA I
I Special feature: none Nickel plating, class I, grade E
to PIN 217, 224, 274, or 275
I , L Screws, machine, Rat head, type II cross recess I L ßlX.6.3 L- Screw
I !
2.10.2 Machine Screw Nuts. Machine screw nuts shall be designated by the following data i n the sequence shown: nominal size (number, fraction, or decimal
MACHINE SCREWS AND MACHINE SCREW NUTS
equivalent); threads per inch; product name; material; protective finish, if required; or, optionally, ASME B18.24.2 PIN code. For example:
EXAMPLE I : 10 - 2 1 Hexagon Machine Screw Nut, Steel, Zinc Plated
N 630N I5 C AAN __ . N 155NNN CE 1 ""
Special feature: none Plating, coating, and passiv- ation: electrodeposited coat- ings of zinc on iron and steel, type II, SC 1
Material and treatment: equiva- lent to PIN O01 through 153
- Diameter (for nuts or inserts) and length (for inserts): 0.190, size 10
-Thread series: UNC -Fastner type: machine screw nuts, hex (inch)
- BIS Standard Designation: BlS.6.3 - Fastener Family: Nut
EXAMPLE 2: ,138 - 3 2 Square Machine Screw Nut, Brass
630N -
i I4 C A6NN 603NNN AA 1 A 1 L Special feature: none
i Machine screw nuts, square (inch) B18.6.3
- Nut
6
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MACHINE SCREWS AND MACHINE SCREW NUTS ASME B18.6.3-1998
Edge of head may be A min. rounded or flat
L G - 4 L Protrusion gage
TABLE 1A DIMENSIONS OF SLOTTED FLAT COUNTERSUNK HEAD MACHINE SCREWS
Nominal Size Head
L H. Ref. Diameter G
Protrusion Above Slot Depth Gaging Diameter or Basic Screw Length Head Diameter Height 'lot Width
Gaging Diameter
A J T F [Note 1411
[Note (111 [Note (211 Max. Min. [Note (311 Max. Min. Max. Min. Max. Min. [Note (411
O000 0.0210 O00 0.0340 O0 0.0470
O 0.0600 1 0.0730 2 0.0860 3 0.0990
4 0.1120 5 0.1250 6 0.1380
8 0.1640 10 0.1900 12 0.2160
1/4 0.2500 0.3125 0.3750
'/16 0.4375
v2 0.5000 0.5625
"/B 0.6250 3/, 0.7500
. . . 0.040
. . . 0.060
. . . 0.087
l/8 0.112 '/a 0.137 '/a 0.162 'h 0.187
3/16 0.212 3/16 0.237 % 6 0.262
l/4 0.312 5/,6 0.362 '18 0.412
'h 0.597 '4 0.717 "8 0.760
9 4 0.815
'/16 0.477
. . . 0.932
. . . 1 .O50
. . . 1.285
0.035 0.055 0.080
0.096 0.120 0.144 0.167
0.191 0.215 0.238
0.285 0.333 0.380
0.442 0.556 0.670 0.715
0.765 0.878 0.990 1.215
0.01 1 0.008 0.016 0.011 0.028 0.017
0.035 0.023 0.043 0.026 0.051 0.031 0.059 0.035
0.067 0.039 0.075 0.043 0.083 0.048
0.100 0.054 0.116 0.060 0.132 0.067
0.153 0.075 0.191 0.084 0.230 0.094 0.223 0.094
0.223 0.106 0.260 0.118 0.298 0.133 0.372 0.149
0.004 0.007 0.010
0.016 0.019 0.023 0.027
0.031 0.035 0.039
0.045 0.050 0.056
0.064 0.072 0.081 0.081
0.091 0.102 0.116 0.131
0.007 0.009 0.014
0.015 0.019 0.023 0.027
0.030 0.034 0.038
0.045 0.053 0.060
0.070 0.088 0.106 O. 103
0.103 0.120 O. 137 0.171
0.003 0.005 0.009
0.010 0.012 0.015 0.017
0.020 0.022 0.024
0.029 0.034 0.039
0.046 0.058 0.070 0.066
0.065 0.077 0.088 0.111
Note (5) Note (51 Note (51
0.026 0.028 0.029 0.031
0.032 0.034 0.036
0.039 0.042 0.045
0.050 0.057 0.065 0.073
0.081 0.089 0.097 0.112
Note (5) Note (5) Note (51
0.016 0.016 0.077 0.018
0.019 0.020 0.021
0.023 0.025 0.027
0.029 0.034 0.039 0.044
0.049 0.053 0.058 0.067
Note (51 Note (5) Note (5)
0.078 0.101 0.124 0.148
0.172 0.196 0.220
0.267 0.313 0.362
0.424 0.539 0.653 0.690
0.739 0.851 0.962 1.186
GENERAL NOTE: For additional requirements refer to para. 2.
NOTES: (11 Where specifying nominal size in decimals, zeros preceding decimal and in the fourth decimal place shall b e omitted. (2) Screws of these lengths and shorter shall have undercut heads as shown in Table 5A. (31 Tabulated values determined from formula for maximum H in Appendix A. (41 No tolerance for gaging diameter is given. If the gaging diameter of the gage used differs from tabulated value, the protrusion will be affected
(5) Not practical to gage. accordingly and the proper protrusion values must be recalculated using the formulas shown in Appendix I.
COPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling ServicesCOPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling Services
ciw
This
typ
e of
re
cess
ha
s a
larg
e ce
nter
op
enin
g,
wide
st
raig
ht
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s,
and
blun
t
botto
m,
woth
al
l ed
ges
relie
ved
or
roun
ded.
TABL
E 1B
IL
LUST
RAT
ION
COPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling ServicesCOPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling Services
TABL
E 1B
D
IMEN
SIO
NS
OF
TYPE
I
CR
OSS
R
ECES
SED
FL
AT
CO
UN
TER
SUN
K H
EAD
M
ACH
INE
SCR
EWS
!i 2 No
mina
l Siz
e
or
Basic
Sc
rew
Diam
eter
Leng
th 1
Head
Diam
eter A
Head
He
ight
Ii,
Ref.
Rece
ss
Protr
usion
Ab
ove
Pene
tratio
n Ga
ging
Diam
eter
Gagin
g F
Rece
ss
Rece
ss
Rece
ss
Diam
eter
6 Di
amete
r De
pth
Widt
h Dr
iver
Gagin
g De
pth
F [N
ote
14)J
G
7
[Not
e (1
11
[Not
e C
iH
Max
. M
in.
[Not
e (3
11
M.
Ref.
T, R
ef.
N,
Ref.
Size
Max
. M
in.
Max
. M
in.
[Not
e (4
11
g
0 0.
0600
1
0.07
30
2 0.
0860
3
0.09
90
4 0.
1120
5
0.12
50
6 0.
1380
8 0.
1640
10
0.19
00
12
0.21
60
v3
‘/4
0.25
00
‘&
0.31
25
“/s
0.37
50
?&
0.43
75
‘I*
0.50
00
?‘,5
0.
5625
“/8
0.
6250
“/a
0.
7500
‘43
0.112
'A
0.13
7 ‘/s
0.
162
‘/8
0.18
7
%a
0.21
2 %
6 0.
237
%I3
0.
262
‘4
0.31
2 5/
6 0.
362
%I
0.41
2
‘/16
0.47
7 ‘4
0.
597
%a
0.71
7 %
0.
760
3/,
0.81
5 .
. 0.
932
. 1.
050
. 1.
285
0.096
0.
035
0.06
2 0.
035
0.01
4 0
0.03
6 0.
020
0.02
6 0.
016
0.12
0 0.
043
0.07
0 0.
043
0.01
5 0
0.04
4 0.
028
0.02
8 0.
016
0.14
4 0.
051
0.09
6 0.
055
0.01
7 1
0.05
6 0.
040
0.02
9 0.
017
0.16
7 0.
059
0.10
0 0.
060
0.01
8 1
0.06
1 0.
045
0.03
1 0.
018
0.191
0.
067
0.12
2 0.
081
0.01
8 1
0.08
2 0.
066
0.03
2 0.
019
0.21
5 0.
075
0.14
8 0.
074
0.02
7 2
0.07
5 0.
052
0.03
4 0.
020
0.23
8 0.
083
0.16
8 0.
094
0.02
9 2
0.09
5 0.
072
0.03
6 0.
021
0.28
5 0.
100
0.18
2 0.
110
0.03
0 2
0.11
0 0.
087
0.039
0.
023
0.26
7
0.33
3 0.
116
0.19
8 0.
124
0.03
2 2
0.12
5 0.
102
0.04
2 0.
025
0.31
3
0.38
0 0.
132
0.26
2 0.
144
0.03
5 3
0.13
9 0.
116
0.04
5 0.
027
0.36
2
0.44
2 0.
153
0.27
6 0.
160
0.03
6 3
0.15
4 0.
131
0.05
0 0.
029
0.42
4 0.
556
0.19
1 0.
358
0.20
5 0.
061
4 0.
196
0.17
4 0.
057
0.03
4 0.
539
0.67
0 0.
230
0.38
6 0.
234
0.06
5 4
0.22
5 0.
203
0.06
5 0.
039
0.65
3
0.71
5 0.
223
0.40
2 0.
250
0.06
8 4
0.24
1 0.
219
0.07
3 0.
044
0.69
0
0.76
5 0.
223
0.41
8 0.
265
0.06
9 4
0.25
6 0.
234
0.08
1 0.
049
0.739
0.87
8 0.
260
0.44
3 0.
289
0.07
3 4
0.28
0 0.
258
0.08
9 0.
053
0.85
1
0.99
0 0.
298
0.56
5 0.
329
0.07
9 5
0.30
9 0.
283
0.09
7 0.
058
0.96
2
1.21
5 0.
372
0.62
8 0.
393
0.08
7 5
0.37
3 0.
347
0.11
2 0.
067
1.18
6
0.07
8 z z
0.10
1 m
0.12
4 0.
148
8 z
0.17
2 0.
196
c=
0.22
0 o,
GEN
ERAL
NO
TES:
(a
) Fo
r ad
ditio
nal
requ
irem
ents
refe
r to
pa
ra.
2.
(b)
For
refe
renc
e,
see
Tabl
e IB
Illu
stra
tion
on
prev
ious
page
.
NOTE
S:
(1)
Whe
re
spec
ifyin
g no
min
al
size
in
decim
als,
ze
ros
prec
edin
g de
cimal
an
d in
th
e fo
urth
de
cimal
pl
ace
shal
l be
om
itted
. (2
) Sc
rews
of
th
ese
leng
ths
and
shor
ter
shal
l ha
ve
unde
rcut
he
ads
as
show
n in
Ta
ble
58.
(3)
Tabu
late
d va
lues
de
term
ined
from
fo
rmula
fo
r m
axim
um
H in
Ap
pend
ix A.
(4
) No
to
lera
nce
for
gagi
ng
diam
eter
is
give
n.
If th
e ga
ging
dia
met
er
of
the
gage
us
ed
diffe
rs
from
ta
bula
ted
value
, th
e pr
otru
sion
will
be
affe
cted
ac
cord
ingl
y an
d th
e R
prop
er
prot
rusio
n va
lues
m
ust
be
reca
lcula
ted
usin
g th
e fo
rmul
as
show
n in
Ap
pend
ix I.
2 a ZiJ
b ;
COPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling ServicesCOPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling Services
,-Edg
e of
he
ad
may
be
This
ty
pe
of r
wcs9
hn
s il
Iarg
c cc
n1cr
op
ening
. wi
de
stra
ighr
w
mgs
. an
d blu
nt
botto
m.
vrilh
all
ed
ges
relie
ved
or
roun
ded.
TABL
E IC
D
IMEN
SIO
NS
OF
TYPE
IA
CR
OSS
R
ECES
SED
FL
AT
CO
UN
TER
SUN
K H
EAD
M
ACH
INE
SCR
EWS
Nom
inal
Si
ze
or
Basi
c Sc
rew
Diam
eter
[Not
e (V
I
Leng
th
[Not
: (2
)I
Head
Di
amet
er
A
Max
. M
in.
Head
He
ight
If,
Re
f.
[Not
e W
I
Rece
ss
Rece
ss
Diam
eter
De
pth
M.
Ref.
T,
Ref.
Rece
ss
Wid
th
N,
Ref.
Drive
r Si
ze
Rece
ss
Pene
tratio
n G
aging
De
pth
Max
. M
in.
Prot
rusio
n Ab
ove
Gag
ing
Gag
ing
Diam
eter
Di
amet
er
F [N
ote
(411
G
Max
. M
in.
[Not
e (4
11
0 0.
0600
1
0.07
30
2 0.
0860
3
0.09
90
0.11
2 0.
096
0.03
5 0.
062
0.03
6 0.
018
0.13
7 0.
120
0.04
3 0.
070
0.04
4 0.
018
0.16
2 0.
144
0.05
1 0.
096
0.05
5 0.
029
0.18
7 0.
167
0.05
9 0.
100
0.06
0 0.
029
0.03
7 0.
021
0.02
6 0.
016
0.07
8 0.
045
0.02
9 0.
028
0.01
6 0.
101
0.05
3 0.
037
0.02
9 0.
017
0.12
4 0.
058
0.04
2 0.
031
0.01
8 0.
148
4 0.
1120
5 0.
1250
6
0.13
80
0.21
2 0.
191
0.06
7 0.
122
0.08
1 0.
030
1 0.
079
0.06
3 0.
032
0.01
9 0.
172
0.23
7 0.
215
0.07
5 0.
148
0.07
7 0.
041
2 0.
071
0.05
3 0.
034
0.02
0 0.
196
0.26
2 0.
238
0.08
3 0.
168
0.09
8 0.
041
2 0.
091
0.07
3 0.
036
0.02
1 0.
220
8 0.
1640
IO
0.
1900
12
0.
2160
0.31
2 0.
285
0.100
0.
182
0.11
2 0.
041
2 0.
107
0.08
9 0.
039
0.02
3 0.
362
0.33
3 0.
116
0.19
8 0.
127
0.04
1 2
0.12
2 0.
104
0.04
2 0.
025
0.41
2 0.
380
0.13
2 0.
262
0.14
9 0.
056
3 0.
136
0.11
8 0.
045
0.02
7
0.26
7 0.
313
0.36
2 5 1
0.42
4 F
0.53
9 Ill
1/
, 0.
2500
5/
6 0.
3125
"18
0.37
50
)/16
0.43
75
0.47
7 0.
442
0.15
3 0.
276
0.16
4 0.
057
0.59
7 0.
556
0.19
1 0.
358
0.21
1 0.
086
0.71
7 0.
670
0.23
0 0.
386
0.23
9 0.
086
0.76
0 0.
715
0.22
3 0.
402
0.25
6 0.
086
0.15
1 0.
133
0.05
0 0.
029
0.19
3 0.
175
0.05
7 0.
034
0.22
2 0.
204
0.06
5 0.
039
0.23
8 0.
220
0.07
3 0.
044
0.65
3 8
0.69
0 g
0.73
9 5
0.85
1 0.
962
2
1.18
6 $
72
0.50
00
%6
0.56
25
5/8
0.62
50
"/4
0.75
00
0.81
5 0.
765
0.22
3 0.
418
0.27
1 0.
086
0.93
2 0.
878
0.26
0 0.
440
0.29
4 0.
087
1.05
0 0.
990
0.29
8 0.
566
0.33
4 0.
098
1.28
5 1.
215
0.37
2 0.
630
0.40
0 0.
099
0.25
3 0.
235
0.08
1 0.
049
0.27
6 0.
258
0.08
9 0.
053
0.30
7 0.
286
0.09
7 0.
058
0.37
2 0.
351
0.11
2 0.
067
GEN
ERAL
NO
TE:
For
addi
tiona
l re
quire
men
ts re
fer
to
para
. 2.
NOTE
S:
El
(I)
Whe
re
spec
ifyin
g no
min
al
size
in
decim
als,
ze
ros
prec
edin
g de
cimal
an
d in
th
e fo
urth
de
cimal
pl
ace
shal
l be
om
itted
. (2
) Sc
rews
of
th
ese
leng
ths
and
shor
ter
shal
l ha
ve
unde
rcut
he
ads
as
show
n in
Ta
ble
5C.
w
(3)
Tabu
late
d va
lues
de
term
ined
from
fo
rmula
fo
r m
axim
um
H in
Ap
pend
ix A.
?i
(4)
No
tole
ranc
e fo
r ga
ging
dia
met
er
is
given
. If
the
gagi
ng
diam
eter
of
th
e ga
ge
used
di
ffers
fro
m
tabu
late
d va
lue,
the
prot
rusio
n w
ill be
af
fect
ed
acco
rdin
gly
and
the
z
prop
er
prot
rusio
n va
lues
m
ust
be
reca
lcula
ted
usin
g th
e fo
rmul
as
show
n in
Ap
pend
ix I.
z d
COPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling ServicesCOPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling Services
TABL
E ID
D
IMEN
SIO
NS
OF
TYPE
II
CR
OSS
R
ECES
SED
FL
AT
CO
UN
TER
SUN
K H
EAD
M
ACH
INE
SCR
EWS
5 Pr
otrus
ion
Abov
e 2
Nom
inal
Size
Head
He
ad
Gagin
g 2
or
Basic
Sc
rew
Leng
th Di
amete
r He
ight
Rece
ss
Rece
ss
Rece
ss
Drive
r Re
cess
Pe
netra
tion
Gagin
g Di
amete
r Di
amete
r m
Diam
eter
1 A
H,
Ref.
Diam
eter
Depth
W
idth
Size
Gagin
g De
pth
F [N
ote
(511
G
t?
[Note
(Il
l [N
ote
WI
Max
. M
in.
[Note
(3
11
M,
Ref.
T, R
ef.
N,
Ref.
[Note
(4
11
Max
. M
in.
Max
. M
in.
[Note
(5
11
$
0 0.0
600
1 0.0
730
2 0.0
860
3 0.0
990
4 0.1
120
5 0.1
250
6 0.1
380
8 0.1
640
10
0.190
0
12
0.216
0
‘/4
0.250
0
5/16
0.312
5
“/8
0.375
0
‘/,c
0.437
5
5;
0.500
0
9/6
0.562
5
5/8
0.625
0
“/a
0.750
0
‘1s
0.112
0.0
96
0.035
0.0
78
0.036
‘h
0.137
0.1
20
0.043
0.0
92
0.048
‘1.
0.1
62
0.144
0.0
51
0.114
0.0
60
‘h 0.1
87
0.167
0.0
59
0.133
0.0
72
346
0.212
0.1
91
0.067
0.1
51
0.082
3A
6 0.2
37
0.215
0.0
75
0.169
0.0
94
3/16
0.262
0.2
38
0.083
0.1
88
0.106
‘h 0.3
12
0.285
0.1
00
0.224
0.1
24
5/16
0.362
0.3
33
0.116
0.2
60
0.148
“6
0.4
12
0.380
0.1
32
0.297
0.1
72
‘46
0.477
0.4
42
0.153
0.3
44
0.195
%
0.597
0.5
56
0.191
0.4
32
0.252
g/6
0.717
0.6
70
0.230
0.5
09
0.302
%
0.7
60
0.715
0.2
23
0.554
0.3
32
“4
0.815
0.7
65
0.223
0.5
93
0.358
. 0.9
32
0.878
0.2
60
0.640
0.3
87
1.050
0.9
90
0.298
0.6
40
0.387
1.285
1.2
15
0.372
0.6
40
0.387
0.021
No
te (6
) No
te (6
)
0.024
No
te (6
) No
te (6
)
0.027
0.0
40
0.029
0.030
0.0
53
0.041
0.032
0.0
64
0.052
0.0
32
0.019
0.1
72
0.035
0.0
77
0.064
0.0
34
0.020
0.1
96
0.038
0.0
89
0.075
0.0
36
0.021
0.2
20
0.043
0.1
13
0.099
0.0
39
0.023
0.2
67
0.048
0.1
37
0.122
0.0
42
0.025
0.3
13
0.054
.
0.162
0.1
45
0.045
0.0
27
0.362
0.061
0.1
93
0.176
0.0
50
0.029
0.4
24
0.074
0.2
51
0.232
0.0
57
0.034
0.5
39
0.086
0.3
03
0.281
0.0
65
0.039
0.6
53
0.092
0.3
32
0.310
0.0
73
0.044
0.6
90
0.098
0.3
59
0.335
0.0
81
0.049
0.7
39
0.104
0.3
89
0.364
0.0
89
0.053
0.8
51
0.104
0.3
89
0.364
0.0
97
0.058
0.9
62
0.104
0.3
89
0.364
0.1
12
0.067
1.1
86
- 0.0
26
0.016
0.0
78
0.028
0.0
16
0.101
-5
0.029
0.0
17
0.124
2
0.031
0.0
18
0.148
GENE
RAL
NOTE
: Fo
r ad
dition
al re
quire
men
ts re
fer
to
para
. 2
NOTE
S:
(1)
Whe
re sp
ecify
ing
nom
inal
size
in de
cimals
, ze
ros
prece
ding
decim
al an
d in
the
fourth
de
cimal
place
sh
all
be
omitte
d.
iz
(2)
Scre
ws
of
these
len
gths
and
shor
ter
shall
ha
ve
unde
rcut
head
s as
sh
own
in Ta
ble
50.
5
(3)
Tabu
lated
va
lues
deter
mine
d fro
m
form
ula
for
max
imum
H
in Ap
pend
ix A.
03
(4)
Point
sa
me
on
all
drive
rs.
G
(5)
No
tolera
nce
for
gagin
g dia
mete
r is
given
. If
the
gagin
g dia
mete
r of
the
ga
ge
used
dif
fers
from
tab
ulated
va
lue,
the
protru
sion
will
be
affec
ted
acco
rding
ly an
d the
b,
L,
prope
r pro
trusio
n va
lues
mus
t be
rec
alcula
ted
using
the
for
mula
s sh
own
in Ap
pend
ix I.
(6)
Not
prac
tical
to
gage
. i
COPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling ServicesCOPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling Services
STD-ASME 818.b.3-ENGL 3998 m 0759670 0634384 827
ASME B18.6.3-1998 MACHINE SCREWS AND MACHINE SCREW NUTS
Edge of head may be
A min. rounded or flat
Al
TABLE 2A DIMENSIONS OF SLOTTED 100 deg FLAT COUNTERSUNK HEAD MACHINE SCREWS Nominal Size or
Depth Gaging Diameter F Diameter
Diameter [Note (I)] Max. Min. [Note (211 Max. Min. Max. Min. Max. Min. [Note (311
Head
A
Head Diameter Width Basic Screw Height
H. Ref.
Slot Slot Protrusion Above Gaging
J T [Note (311 G
O000 0.0210 O00 0.0340 O0 0.0470
O 0.0600 1 0.0730 2 0.0860 3 0.0990
4 0.1120 6 0.1380 8 0.1640 10 0.1900
0.2500 0.3125
3/8 0.3750
O. 040 0.060 0.087
0.112 0.137 O. 162 0.187
0.212 0.262 0.312 0.362
0.477 0.597 0.717
0.035 0.009 0.008 0.055 0.014 0.012 0.080 0.020 0.017
0.095 0.026 0.023 0.118 0.031 0.026 0.142 0.037 0.031 0.165 0.043 0.035
0.188 0.049 0.039 0.235 0.060 0.048 0.282 0.072 0.054 0.329 0.083 0.060
0.437 0.110 0.075 0.550 0.138 0.084 0.662 0.165 0.094
0.005 0.008 0.010
0.016 0.019 0.023 0.027
0.031 0.039 0.045 0.050
0.064 0.072 0.081
0.008 0.004 0.01 1 0.007 0.013 0.008
0.013 0.008 0.016 0.010 0.019 0.012 0.022 0.014
0.024 0.017 0.030 0.022 0.036 0.027 0.042 0.031
0.055 0.042 0.069 0.053 0.083 0.065
Note (4) Note (4) Note (4)
0.020 0.021 0.022 0.024
0.025 0.028 0.031 0.034
0.040 0.047 0.053
Note (4) Note (4) Note (4)
0.012 0.013 0.014 0.01 5
0.016 0.017 0.019 0.021
0.025 0.030 0.034
Note (4) Note (4) Note (4)
0.074 0.098 0.121 0.144
O. 167 0.214 0.261 0.307
0.415 0.526 0.638
GENERAL NOTE: For additional requirements refer to para. 2. NOTES: (1) Where specifying nominal size in decimals, zeros preceding decimal and in the fourth decimal place shall be omitted. (2) Tabulated values determined from formula for maximum H in Appendix A. (3) No tolerance for gaging diameter is given. If the gaging diameter of the gage used differs from tabulated value, the protrusion
will be affected accordingly and the proper protrusion values must be recalculated using the formulas shown in Appendix I. (4) Not practical to gage.
12
COPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling ServicesCOPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling Services
MACHINE SCREWS AND MACHINE SCREW NUTS ASME 818.6.3-1998
This type of recess has a large center opening, tapered wings, and blunt bottom, with all edges relieved or rounded.
Edge of head may be
A min. rounded or flat
LG-4 L Protrusion gage
6 F i n .
Not to exceed maximum major diameter of thread
Optional Shoulder for Long Screws with
Reduced Body
TABLE 2B DIMENSIONS OF TYPE I CROSS RECESSED 100 deg FLAT COUNTERSUNK HEAD MACHINE SCREWS
~~ ~ ~ ~~~~ ~~
Nominal Size or Basic Recess Gaging Gaging
Screw Diameter Height Recess Recess , Recess Penetration Diameter F Diameter
Diameter [Note (111 Max. Min. [Note (211 M, Ref. T, Ref. N, Ref. Size Max. Min. Max. Min. [Note (311
Protrusion Above
Head Head
H, Ref. Diameter Depth Width Driver Gaging Depth [Note (3)1 G A
O 0.0600 0.112 0.095 0.026 0.054 0.027 0.013 O 0.028 0.012 0.020 0.012 0.074 1 0.0730 0.137 0.118 0.031 0.062 0.035 0.014 O 0.036 0.020 0.021 0.013 0.098 2 0.0860 0.162 0.142 0.037 0.088 0.048 0.012 1 0.049 0.033 0.022 0.014 0.121 3 0.0990 0.187 0.165 0.043 0.096 0.055 0.014 1 0.056 0.040 0.024 0.015 0.144
4 0.1120 0.212 0.188 0.049 0.110 0.070 0.018 1 0.071 0.055 0.025 0.016 0.167 6 0.1380 0.262 0.235 0.060 0.148 0.074 0.027 2 0.075 0.052 0.028 0.017 0.214 8 0.1640 0.312 0.282 0.072 0.162 0.090 0.028 2 0.090 0.067 0.031 0.019 0.261
10 0.1900 0.362 0.329 0.083 0.178 0.104 0.030 2 0.105 0.082 0.034 0.021 0.307
'/e 0.2500 0.477 0.437 0.110 0.240 0.124 0.033 3 0.118 0.095 0.040 0.025 0.415 0.3125 0.597 0.550 0.138 0.310 0.157 0.053 4 0.148 0.126 0.047 0.030 0.526
'//S 0.3750 0.717 0.662 0.165 0.336 0.182 0.056 4 0.173 0.151 0.053 0.034 0.638
GENERAL NOTE: For additional requirements refer t o para. 2. NOTES: (1) Where specifying nominal size in decimals, zeros preceding decimal and in the fourth decimal place shall be omitted. (2) Tabulated values determined from formula for maximum H in Appendix A. (3) No tolerance for gaging diameter is given. If the gaging diameter of the gage used differs from tabulated value, the protrusion
will be affected accordingly and the proper protrusion values must be recalculated using the formulas shown in Appendix I.
13
COPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling ServicesCOPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling Services
ASME 618.6.3-1998 MACHINE SCREWS AND MACHINE SCREW NUTS
Edge of head may be rounded or flat
This type of recess has a large center Protrusion gage opening, wide straight wings, and blunt bottom, with all edges relieved or rounded.
62[min.
Not to exceed maximum major diameter of thread
Optional Shoulder for Long Screws with
Reduced Body
TABLE 2C DIMENSIONS OF TYPE IA CROSS RECESSED 100 deg FLAT COUNTERSUNK HEAD MACHINE SCREWS
Nominal Size or Basic
Recess Gaging Gaging
Screw Diameter Height Recess Recess Recess Penetration Diameter F Diameter
Diameter [Note (111 Max. Min. [Note (211 M, Ref. T, Ref. N, Ref. Size Max. Min. Max. Min. [Note (311
O 0.0600 0.112 0.095 0.026 0.054 0.028 0.018 O 0.029 0.013 0.020 0.012 0.074 1 0.0730 0.137 0.118 0.031 0.062 0.036 0.018 O 0.037 0.021 0.021 0.013 0.098 2 0.0860 0.162 0.142 0.037 0.088 0.048 0.028 1 0.046 0.030 0.022 0.014 0.121 3 0.0990 0.187 0.165 0.043 0.096 0.055 0.029 1 0.053 0.037 0.024 0.015 0.144
Protrusion Above
Head
A
Head
H, Ref. Diameter Depth Width Driver Gaging Depth [Note (311 G
4 0.1120 0.212 0.188 0.049 0.1 10 0.070 0.029 1 0.068 0.052 0.025 0.016 0.167 6 0.1380 0.262 0.235 0.060 0.148 0.077 0.041 2 0.071 0.053 0.028 0.017 0.214 8 0.1640 0.312 0.282 0.072 0.162 0.092 0.041 2 0.086 0.068 0.031 0.019 0.261 10 0,1900 0.362 0.329 0.083 0.178 0.107 0.041 2 0.101 0.083 0.034 0.021 0.307
0.2500 0.477 0.437 0.110 0.240 0.126 0.056 3 0.114 0.096 0.040 0.025 0.415 0.3125 0.597 0.550 0.138 0.310 0.163 0.085 4 0.145 0.127 0.047 0.030 0.526
'//B 0.3750 0.717 0.662 0.165 0.336 0.187 0.085 4 0.170 0.152 0.053 0.034 0.638
GENERAL NOTE: For additional requirements refer to para. 2. NOTES: (1) Where specifying nominal size in decimals, zeros preceding decimal and in the fourth decimal place shall be omitted. (2) Tabulated values determined from formula for maximum H in Appendix A. (3) No tolerance for gaging diameter is given. If the gaging diameter of the gage used differs from tabulated value, the protrusion
will be affected accordingly and the proper protrusion values must be recalculated using the formulas shown in Appendix I.
14
COPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling ServicesCOPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling Services
MACHINE SCREWS AND MACHINE SCREW NUTS ASME 818.6.3-1998
This type of recess consists of two intersecting slots with parallel sides converging to a slightly truncated aDex at bottom of recess.
Edge of head may be
A min. rounded or flat
l " L 4 L Protrusion gage
k i n .
Not to exceed maximum major diameter of thread
Optional Shoulder for Long Screws with
Reduced Body
TABLE 2D DIMENSIONS OF TYPE II CROSS RECESSED 100 deg FLAT COUNTERSUNK HEAD MACHINE SCREWS
Nominal Size or Basic
Screw Height Recess Recess Recess Driver Diameter F Diameter Diameter [Note ( l ) ] Max. Min. [Note (211 M, Ref. T, Ref. N, Ref. [Note (311 Max. Min. Max. Min. [Note (411
Protrusion Above
Head
A
Head Gaging Gaging
H, Ref. Diameter Depth Width Size Gaging Depth [Note 14)l G
~~ ~ ~ _ _ _ _ _ _ _ _______
O 0.0600 0.112 0.095 1 0.0730 0.137 0.118 2 0.0860 0.162 0.142 3 0.0990 0.187 0.165
4 0.1120 0.212 0.188 6 0.1380 0.262 0.235 8 0.1640 0.312 0.282
10 0.1900 0.362 0.329
'/4 0.2500 0.477 0.437 5/16 0.3125 0.597 0.550 '//B 0.3750 0.717 0.662
0.026 0.031 0.037 0.043
0.049 0.060 0.072 0.083
0.110 O. 138 O. 165
0.057 0.078 0.092 0.113
0.131 0.157 O. 185 0.219
0.288 0.355 0.433
0.026 0.020 0.040 0.023 0.048 0.025 0.061 0.027
0.070 0.029 0.086 0.033 0.102 0.037 0.1 22 0.042
0.164 0.053 0.207 0.063 0.258 0.075
. . . Note (5)
. . . Note (5)
. . . 0.025
. . . 0.039
. . . 0.051
. . . 0.068
. . . 0.086
. . . o. 1 o9
. . . O. 154
. . . 0.197
. . . 0.249
Note (5) Note (5)
0.01 5 0.028
0.036 0.051 0.067 0.087
O. 132 0.175 0.226
0.020 0.012 0.074 0.021 0.013 0.098 0.022 0.014 0.121 0.024 0.015 0.144
0.025 0.016 0.167 0.028 0.017 0.214 0.031 0.019 0.261 0.034 0.021 0.307
0.040 0.025 0.415 0.047 0.030 0.526 0.053 0.034 0.638
GENERAL NOTE: For additional requirements refer to para. 2. NOTES: (1) Where specifying nominal size in decimals, zeros preceding decimal and in the fourth decimal place shall be omitted. (2) Tabulated values determined from formula for maximum H in Appendix A. (3) Point same on all drivers. (4) No tolerance for gaging diameter is given. If the gaging diameter of the gage used differs from tabulated value, the protrusion
will be affected accordingly and the proper protrusion values must be recalculated using the formulas shown in Appendix l. (5) Not practical to gage.
15
COPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling ServicesCOPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling Services
ASME 818.6.3-1998
I
MACHINE SCREWS AND MACHINE SCREW NUTS
Edge of head may be
A min. rounded or flat
TABLE 3A DIMENSIONS OF SLOlTED CLOSE TOLERANCE 100 deg FLAT COUNTERSUNK HEAD MACHINE SCREWS
Nominal Size or Basic
Diameter
Head
A
Head Diameter Width Screw Height
H, Ref.
Slot Slot Protrusion Above Gaging
G
Depth Gaging Diameter F Diameter J T [Note (311
[Note (1)1 Max. Min. [Note (211 Max. Min. Max. Min. Max. Min. [Note (311
4 0.1120 0.212 0.188 0.049 0.039 0.031 0.024 0.017 0.025 0.019 0.167 6 0.1380 0.262 0.235 0.060 0.048 0.039 0.030 0.022 0.028 0.021 0.2 14 8 0.1640 0.312 0.282 0.072 0.054 0.045 0.036 0.027 0.031 0.023 0.261
10 0.1900 0.362 0.329 0.083 0.060 0.050 0.042 0.031 0.034 0.026 0.307
0.2500 0.477 0.437 0.110 0.075 0.064 0.055 0.042 0.040 0.031 0.41 5 V16 0.3125 0.597 0.550 O. 138 0.084 0.072 0.069 0.053 0.047 0.037 0.526 3/8 0.3750 0.717 0.662 O. 165 0.094 0.081 0.083 0.065 0.053 0.042 0.638
7/16 0.4375 0.837 0.774 O. 193 0.094 0.081 0.097 0.076 0.060 0.047 0.750
0.5000 0.957 0.887 0.221 0.106 0.091 0.111 0.088 0.066 0.053 0.862 0.5625 1.077 1.000 0.249 0.118 0.102 0.125 0.099 0.073 0.058 0.974 0.6250 1.197 1.112 0.276 0.133 0.116 0.139 0.111 0.080 0.063 1 .O86
GENERAL NOTE: For additional requirements refer t o para. 2. NOTES: (1) Where specifying nominal size in decimals, zeros preceding decimal and in the fourth decimal place shall be omitted. (2) Tabulated values determined from formula for maximum H in Appendix A. (3) No tolerance for gaging diameter is given. If the gaging diameter of the gage used differs from tabulated value, the protrusion
will be affected accordingly and the proper protrusion values must be recalculated using the formulas shown in Appendix I.
16
COPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling ServicesCOPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling Services
STDmASME BLB.b-3-ENGL L998 9 0759670 ObL4189 309
MACHINE SCREWS AND MACHINE SCREW NUTS ASME B18.6.3-1998
This type of recess has a large center opening, tapered wings, and blunt bottom, with all edges relieved or rounded.
TABLE 3B
f in.
Not to exceed maximum major
thread 1 diameter of
Optional Shoulder for Long Screws with
Reduced Body
DIMENSIONS OF TYPE I CROSS RECESSED CLOSE TOLERANCE 100 dea FLAT
Nominal Size or Basic
Screw Diameter [Note 1111
Head Diameter
A
Max. Min.
4 0.1120 6 0.1380 8 0.1640
10 0.1900
0.212 0.188 0.262 0.235 0.312 0.282 0.362 0.329
COUNTERSUNK HEAD MACHINE SCREWS ..
Protrusion Above
Head Recess Gaging Height Recess Recess Recess H, Ref. Diameter Depth Width Driver Gaging Depth [Note I3l1
[Note 1211 M, Ref. T, Ref. N, Ref. Size Max. Min. Max. Min.
0.049 0.110 0.070 0.018 1 0.071 0.055 0.025 0.019 0.060 0.148 0.074 0.027 2 0.075 0.052 0.028 0.021 0.072 0.162 0.090 0.028 2 0.090 0.067 0.031 0.023 0.083 0.178 0.104 0.030 2 0.105 0.082 0.034 0.026
Penetration Diameter F Gaging
Diameter G
[Note (311
0.167 0.214 0.261 0.307
0.2500 0.477 0.437 0.110 0.240 0.124 0.033 3 0.118 0.095 0.040 0.031 0.415 5/16 0.3125 0.597 0.550 0.138 0.310 0.157 0.053 4 0.148 0.126 0.047 0.037 0.526
0.3750 0.717 0.662 0.165 0.336 0.182 0.056 4 0.173 0.151 0.053 0.042 0.638 '/,e 0.4375 0.837 0.774 0.193 0.360 0.207 0.060 4 0.198 0.176 0.060 0.047 0.750
'12 0.5000 0.957 0.887 0.221 0.386 0.234 0.063 4 0.226 0.204 0.066 0.053 0.862 ' / / I S 0.5625 1.077 1.000 0.249 0.418 0.265 0.069 4 0.256 0.234 0.073 0.058 0.974
'/B 0.6250 1.197 1.112 0.276 0.504 0.265 0.073 5 0.248 0.222 0.080 0.063 1.086
GENERAL NOTE: For additional requirements refer to para. 2. NOTES: (1) Where specifying nominal size in decimals, zeros preceding decimal and in the fourth decimal place shall be omitted, (2) Tabulated values determined from formula for maximum H in Appendix A. (3) No tolerance for gaging diameter is given. If the gaging diameter of the gage used differs from tabulated value, the protrusion
wil l be affected accordingly and the proper protrusion values must be recalculated using the formulas shown in Appendix 1.
17
COPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling ServicesCOPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling Services
ASME B18.6.3-1998 MACHINE SCREWS AND MACHINE SCREW NUTS
Edge of head may be rounded or flat
This type of recess has a large center Protrusion gage opening, wide straight wings, and blunt bottom, with all edges relieved or rounded.
zimi n
Not to exceed maximum major diameter of thread
Optional Shoulder for Long Screws with
Reduced Body
TABLE 3C DIMENSIONS OF TYPE IA CROSS RECESSED CLOSE TOLERANCE 100 deg FLAT COUNTERSUNK HEAD MACHINE SCREWS
Protrusion " . . Recess Above Nominal Size or Penetration Gaging Gaging
Gaging Diameter F Diameter
Diameter Depth [Note (311 G
[Note (111 Max. Min. [Note (2)] M, Ref. T, Ref. N, Ref. Size Max. Min. Max. Min. [Note (311
Head
A
Head Basic Screw Diameter Height Recess Recess Recess
H, Ref. Diameter Depth Width Driver
4 0.1120 0.212 0.188 0.049 0.1 10 0.070 0.029 1 0.068 0.052 0.025 0.019 0.167 6 0.1380 0.262 0.235 0.060 0.148 0.077 0.041 2 0.071 0.053 0.028 0.021 0.214 8 0.1640 0.312 0.282 0.072 0.162 0.092 0.041 2 0.086 0.068 0.031 0.023 0.261
10 0.1900 0.362 0.329 0.083 0.178 0.107 0.041 2 0.101 0.083 0.034 0.026 0.307
0.2500 0.477 0.437 0.110 0.240 0.126 0.056 3 0.114 0.096 0.040 0.031 0.415 5/16 0.3125 0.597 0.550 0.138 0.310 0.163 0.085 4 0.145 0.127 0.047 0.037 0.526 '4 0.3750 0.717 0.662 0.165 0.336 0.187 0.085 4 0.170 0.152 0.053 0.042 0.638
7/16 0.4375 0.837 0.774 0.193 0.360 0.208 0.086 4 0.194 0.176 0.060 0.047 0.750
v2 0.5000 0.957 0.887 0.221 0.386 0.239 0.086 4 0.222 0.204 0.066 0.053 0.862 0.5625 1.077 1.000 0.249 0.418 0.271 0.086 4 0.253 0.235 0.073 0.058 0.974 0.6250 1.197 1.112 0.276 0.488 0.256 0.097 5 0.228 0.207 0.080 0.063 1.086
GENERAL NOTE: For additional requirements refer to para. 2. NOTES: (1) Where specifying nominal size in decimals, zeros preceding decimal and in the fourth decimal place shall be omitted. (2) Tabulated values determined from formula for maximum H in Appendix A. (3) No tolerance for gaging diameter is given. If the gaging diameter of the gage used differs from tabulated value, the protrusion
wil l be affected accordingly and the proper protrusion values must be recalculated using the formulas shown in Appendix 1 .
COPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling ServicesCOPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling Services
“ X N E SCREWS AND MACHINE SCREW NUTS ASME B18.6.3-1998
This type of recess has a large center opening, wide straight wings, and blunt bottom, with all edges relieved or rounded.
L Protrusion gage
-c( 0.062 min.
Not to exceed maximum major diameter of thread
Optional Shoulder for Long Screws with
Reduced Body
TABLE 3 0 DIMENSIONS OF TYPE II CROSS RECESSED CLOSE TOLERANCE 100 deg FLAT COUNTERSUNK HEAD MACHINE SCREWS
Nominal Size or
Basic Screw Diameter [Note (111
Head Diameter
A
Max. Min.
Head Height Recess H, Ref. Diameter
[Note (211 M, Ref.
4 0.1120 6 0.1380 8 0.1640
10 0.1900
’/d 0.2500 716 0.3125
’/B 0.3750 7/16 0.4375
’/* 0.5000 ’116 0.5625
5/8 0.6250
0.212 0.188 0.262 0.235 0.312 0.282 0.362 0.329
O. 049 0.131 0.060 O. 157 0.072 0.185 0.083 0.219
Recess Depth T, Ref.
0.070 0.086 0.102 o. 122
Recess Width N, Ref.
0.029 0.033 0.037 0.042
0.477 0.437 0.110 0.288 0.164 0.053 0.597 0.550 0.138 0.355 0.207 0.063 0.717 0.662 0.165 0.433 0.258 0.075 0.837 0.774 0.193 0.496 0.302 0.085
0.957 0.887 0.221 0.555 0.338 0.093 1.077 1.000 0.249 0.628 0.385 0.104 1.197 1.112 0.276 0.687 0.424 0.113
Protrusion Recess Above
Penetration Gaging Driver Gaging Diameter F
[Note (3)1 Max. Min. Max. Min. Size Depth [Note (411
Gaging Diameter
G [Note (411
. . . 0.051 0.036 0.025 0.019
. . . 0.068 0.051 0.028 0.021
. . . 0.086 0.067 0.031 0.023
. . . 0.109 0.087 0.034 0.026
. . . 0.154 0.132 0.040 0.031
. . . 0.197 0.175 0.047 0.037
. . . 0.249 0.226 0.053 0.042
. . . 0.292 0.269 0.060 0.047
. . . 0.328 0.304 0.066 0.053
. . . 0.376 0.352 0.073 0.058
. . . 0.415 0.390 0.080 0.063
O. 167 0.214 0.261 0.307
0.41 5 0.526 0.638 0.750
0.862 0.974 1 .O86
GENERAL NOTE: For additional requirements refer to para. 2. NOTES: (1) Where specifying nominal size in decimals, zeros preceding decimal and in the fourth decimal place shall be omitted. (2) Tabulated values determined from formula for maximum H in Appendix A. (3) Point same on all drivers. (4) No tolerance for gaging diameter is given. If the gaging diameter of the gage used differs from tabulated value, the protrusion
will be affected accordingly and the proper protrusion values must be recalculated using the formulas shown in Appendix I.
19
COPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling ServicesCOPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling Services
Edge
of
he
ad
may
be
fla
t or
ro
unde
d
Prot
rusio
n ga
ge
HOP
L,
(see
pa
ra.
2.2)
-d
TABL
E 4A
IL
LUST
RAT
ION
COPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling ServicesCOPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling Services
AZ
TABL
E 4A
D
IMEN
SIO
NS
OF
SLO
TTED
O
VAL
CO
UN
TER
SUN
K H
EAD
M
ACH
INE
SCR
EWS
5 K No
min
al
Size
Pr
otru
sion
Abov
e s
or
Basi
c He
ad
Head
To
tal
H Sl
ot
Slot
G
aging
Di
amet
er
s
Scre
w Le
ngth
Di
amet
er
Side
ea
d He
ad
Gag
ing
v,
Heig
ht
Cr o
wn
Heig
ht
0,
Wid
th
Dept
h F
[Not
e (5
11
Diam
eter
Diam
eter
L
A H,
Re
f. He
ight
Re
f. J
T G
[Not
e (1
)1
00
0.047
0
0 0.0
600
1 0.0
730
2 0.0
860
3 0.0
990
[Not
e (2
11
Max
.
0.087
‘h 0.1
12
l/B
0.137
‘h 0.1
62
‘h 0.1
87
Min.
[N
ote
(311
C.
Re
f. [N
ote
(411
M
ax.
Min.
M
ax.
Min.
M
ax.
Min.
[N
ote
(511
2 D
0.080
0.0
28
0.014
0.096
0.0
35
0.021
0.1
20
0.043
0.0
25
0.144
0.0
51
0.029
0.1
67
0.059
0.0
33
0.042
0.0
17
0.056
0.0
23
0.068
0.0
26
0.080
0.0
31
0.092
0.0
35
0.104
0.0
39
0.116
0.0
43
0.128
0.0
48
0.010
0.016
0.019
0.023
0.027
0.023
0.030
0.038
0.045
0.052
0.016
0.025
0.031
0.037
0.043
Note
(6)
Note
(6)
0.047
0.0
31
0.053
0.0
35
0.058
0.0
39
0.064
0.0
44
Note
(6)
2
0.078
f?
0.101
m
0.124
:
0.148
?i z
0.172
z
0.196
2
0.220
4 0.1
120
5 0.1
250
6 0.1
380
8 0.1
640
10
0.190
0
h)
12
0.216
0
‘/4
0.250
0
5/16
0.312
5
3/8
0.375
0
‘/,G
0.437
5
‘/*
0.500
0
9/6
0.562
5
“/I
0.625
0
3/.s
0.2
12
3/6
0.237
3/16
0.262
sh
0.312
%ii
0.362
“43
0.4
12
%6
0.477
5;
0.597
g/6
0.717
“h
0.760
%
0.815
0.932
1.050
0.191
0.0
67
0.037
0.215
0.0
75
0.041
0.238
0.0
83
0.045
0.031
0.
059
0.04
9 0.0
69
0.048
0.035
0.0
67
0.055
0.0
75
0.053
0.039
0.0
74
0.060
0.0
80
0.057
0.285
0.1
00
0.052
0.1
52
0.054
0.0
45
0.088
0.0
72
0.091
0.0
66
0.267
0.333
0.1
16
0.060
0.1
76
0.060
0.0
50
0.103
0.0
84
0.102
0.0
75
0.313
0.380
0.1
32
0.068
0.2
00
0.067
0.0
56
0.117
0.0
96
0.113
0.0
84
0.362
0.442
0.1
53
0.079
0.2
32
0.075
0.0
64
0.136
0.1
12
0.129
0.0
95
0.424
0.556
0.1
91
0.099
0.2
90
0.084
0.0
72
0.171
0.1
41
0.155
0.1
17
0.539
0.670
0.2
30
0.117
0.3
47
0.094
0.0
81
0.206
0.1
70
0.182
0.1
39
0.653
0.715
0.2
23
0.122
0.3
45
0.094
0.0
81
0.210
0.1
74
0.195
0.1
50
0.690
0.765
0.8
78
0.990
0.223
0.1
31
0.354
0.1
06
0.09
1 0.2
16
0.176
0.2
12
0.163
0.7
39
0.260
0.1
50
0.410
0.1
18
0.102
0.2
50
0.207
0.2
39
0.184
0.8
51
0.298
0.1
69
0.467
0.1
33
0.116
0.2
85
0.235
0.2
66
0.206
0.9
62
0.372
0.2
06
0.578
0.1
49
0.131
0.3
53
0.293
0.3
18
0.240
1.1
86
“/4
0.750
0 1.2
85
1.215
GENE
RAL
NOTE
S:
(a)
For
addit
ional
requ
irem
ents
refer
to
pa
ra.
2.
(b)
For
refer
ence
, se
e Ta
ble
4A
Illustr
ation
on
pre
vious
pa
ge.
NOTE
S:
(1)
Whe
re sp
ecify
ing
nom
inal
size
in de
cimals
, ze
ros
prece
ding
decim
al an
d in
the
fourth
de
cimal
place
sh
all
be
omitte
d.
(2)
Scre
ws
of
these
len
gths
and
shor
ter
shall
ha
ve
unde
rcut
head
s as
sh
own
in Ta
ble
6A.
(3)
Tabu
lated
va
lues
deter
mine
d fro
m
form
ula
for
max
imum
H
in Ap
pend
ix A.
(4
) Ta
bulat
ed
value
s de
term
ined
from
for
mula
fo
r m
axim
um
0 in
Appe
ndix
A.
R
(5)
No
tolera
nce
for
gagin
g dia
mete
r is
given
. If
the
gagin
g dia
mete
r of
the
ga
ge
used
dif
fers
from
tab
ulated
va
lue,
the
protru
sion
will
be
affec
ted
acco
rding
ly an
d the
,$
prope
r pro
trusio
n va
lues
mus
t be
rec
alcula
ted
using
the
for
mula
s sh
own
in Ap
pend
ix I.
W
(6)
Not
prac
tical
to
gage
. m
&I
b z 8
COPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling ServicesCOPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling Services
03
pa
F w
w
This
typ
e of
re
cess
ha
s a
larg
e ce
nter
op
enin
g,
tape
red
wing
s,
and
blun
t bo
ttom
, wi
th
all
edge
s re
lieve
d or
ro
unde
d.
p-“-1
,-E
dgeo
f he
ad
may
be
fla
t or
ro
unde
d
Prot
rusio
n ga
ge
k- L,
(s
ee
para
. 2.
2)
-4
TAB
LE
4B
ILLU
ST
RA
TIO
N
COPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling ServicesCOPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling Services
s m
TABL
E 4B
D
IMEN
SIO
NS
OF
TYPE
I C
RO
SS
REC
ESSE
D
OVA
L C
OU
NTE
RSU
NK
HEA
D
MAC
HIN
E SC
REW
S %
Pr
otru
sion
if
Nom
inal
Si
ze
Head
To
tal
Abov
e s cn
or
Basi
c He
ad
Side
He
ad
Head
Re
cess
G
aging
Scre
w Le
ngth
Di
amet
er
Heig
ht
Crow
n Pe
netra
tion
Diam
eter
F
Gag
ing
2 He
ight
Re
cess
Re
cess
Re
cess
Di
amet
er
L A
Diam
eter
Q
H.
Ref.
Heig
ht
0,
Ref.
Diam
eter
De
pth
Wid
th
Drive
r G
aging
De
pth
[Not
e (5
11
G
[Not
e W
I [N
ote
(211
M
ax.
Min.
[N
ote
1311
C,
Re
f. [N
ote
(411
M
, Re
f. T,
Ref
. N,
Re
f. Si
ze
Max
. M
in.
Max
. M
in.
5 [N
ote
(511
2 -
0 0.
0600
1 0.
0730
2
0.08
60
3 0.
0990
‘h
0.11
2
'43
0.13
7
23
0.16
2
'/, 0.
187
0.09
6 0.
120
0.14
4
0.16
7
0.03
5 0.
043
0.05
1 0.
059
0.02
1
0.02
5 0.
029
0.03
3
0.05
6 0.
068
0.08
0 0.
092
0.06
8 0.
070
0.10
6 0.
118
0.03
6 0.
039
0.06
0 0.
072
0.01
4 0.
015
0.01
8 0.
019
0.03
8 0.
041
0.06
2 0.
074
0.02
0 0.
023
0.04
5 0.
057
0.04
7
0.05
3 0.
058
0.06
4
0.03
1 0.
035
0.03
9 0.
044
0.07
8 5
0.10
1 g
0.12
4 it
0.14
8 s
0.17
2 E
0.19
6 i?
!
4 0.
1120
%
6 0.
212
0.19
1 0.
067
0.03
7 0.
104
0.13
0 0.
086
0.01
9 1
0.08
7 0.
070
0.06
9 0.
048
5 0.
1250
%
s 0.
237
0.21
5 0.
075
0.04
1 0.
116
0.15
2 0.
073
0.02
8 2
0.07
4 0.
050
0.07
5 0.
053
6 0.
1380
%
3 0.
262
0.23
8 0.
083
0.04
5 0.
128
0.17
2 0.
092
0.03
0 2
0.09
4 0.
069
0.08
0 0.
057
0.22
0
8 0.
1640
sh
0.
312
0.28
5 0.
100
0.05
2 0.
152
0.18
6 0.
107
0.03
1 2
0.10
8 0.
084
0.09
1 0.
066
0.26
7 10
0.
1900
%
6 0.
362
0.33
3 0.
116
0.06
0 0.
176
0.20
2 0.
125
0.03
3 2
0.12
6 0.
102
0.10
2 0.
075
0.31
3 E
12
0.21
60
"h
0.41
2 0.
380
0.13
2 0.
068
0.20
0 0.
264
0.14
0 0.
038
3 0.
135
0.11
1 0.
113
0.08
4 0.
362
& 0.
2500
7/
s 0.
477
0.44
2 0.
153
0.07
9 0.
232
0.28
4 0.
160
0.04
0 5/
,6
0.31
25
5;
0.59
7 0.
556
0.19
1 0.
099
0.29
0 0.
384
0.22
6 0.
065
"/8
0.37
50
9/16
0.
717
0.67
0 0.
230
0.11
7 0.
347
0.40
4 0.
245
0.06
8 v&
g 0.
4375
%
0.
760
0.71
5 0.
223
0.12
2 0.
345
0.41
6 0.
257
0.07
0
0.15
6 0.
131
0.12
9 0.
095
0.42
4 0.
218
0.19
4 0.
155
0.11
7 0.
539
0.23
7 0.
213
0.18
2 0.
139
0.65
3 0.
249
0.22
5 0.
195
0.15
0 0.
690
5;
0.50
00
“/a
0.81
5
g/16
0.
5625
0.
932
5/a
0.62
50
1.05
0
"/4
0.75
00
. .
. 1.
285
0.76
5 0.
223
0.13
1 0.
354
0.43
0 0.
271
0.87
8 0.
260
0.15
0 0.
410
0.46
2 0.
304
0.99
0 0.
298
0.16
9 0.
467
0.58
0 0.
340
1.21
5 0.
372
0.20
6 0.
578
0.64
2 0.
406
0.07
1 4
0.26
3 0.
239
0.21
2 0.
163
0.73
9 0.
075
4 0.
296
0.27
2 0.
239
0.18
4 0.
851
0.08
1 5
0.32
3 0.
291
0.26
6 0.
206
0.96
2 0.
088
5 0.
388
0.35
7 0.
318
0.25
1 1.
186
GEN
ERAL
NO
TES:
(a
) Fo
r ad
ditio
nal
requ
irem
ents
refe
r to
pa
ra.
2.
fb)
For
refe
renc
e,
see
Tabl
e 48
Illu
stra
tion
on
prev
ious
page
.
NOTE
S:
(I)
Whe
re
spec
ifyin
g no
min
al
size
in
decim
als,
ze
ros
prec
edin
g de
cimal
an
d in
th
e fo
urth
de
cimal
pl
ace
shal
l be
om
itted
. (2
) Sc
rews
of
th
ese
leng
ths
and
shor
ter
shal
l ha
ve
unde
rcut
he
ads
as
show
n in
Ta
ble
66.
(3)
Tabu
late
d va
lues
de
term
ined
from
fo
rmula
fo
r m
axim
um
H in
Ap
pend
ix A.
(4
) Ta
bula
ted
valu
es
dete
rmine
d fro
m
form
ula
for
max
imum
0
in
Appe
ndix
A.
R
(5)
No
tole
ranc
e fo
r ga
ging
dia
met
er
is
given
. If
the
gagi
ng
diam
eter
of
th
e ga
ge
used
di
ffers
fro
m
tabu
late
d va
lue,
the
prot
rusio
n w
ill be
af
fect
ed
acco
rdin
gly a
nd
the
2
prop
er
prot
rusio
n va
lues
m
ust
be
reca
lcula
ted
usin
g th
e fo
rmul
as
show
n in
Ap
pend
ix I.
m
p3
P,
u I, ;
COPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling ServicesCOPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling Services
This
typ
e of
re
cess
ha
s a
larg
e ce
nter
op
enin
g,
wide
st
raig
ht
wing
s,
and
blun
t bo
ttom
, wi
th
all
edge
s re
lieve
d or
ro
unde
d.
Prot
rusio
n ga
ge
4 0
k &
=----
-+
FL
LO
(see
pa
ra.
2.2)
.-d
TABL
E 4C
IL
LUST
RAT
ION
COPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling ServicesCOPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling Services
3 5 2 m
TABL
E 4C
D
IMEN
SIO
NS
OF
TYPE
IA
CR
OSS
R
ECES
SED
O
VAL
CO
UN
TER
SUN
K H
EAD
M
ACH
INE
SCR
EWS
B Pr
otrus
ion
!Y
Nom
inal
Size
Head
To
tal
Abov
e 5
or
Basic
He
ad
Diam
eter
Side
Head
He
ad
Rece
ss
Gagin
g Ga
ging
z
Scre
w Le
ngth
Heigh
t Cr
own
A He
ight
Rece
ss
Rece
ss
Rece
ss
Pene
tratio
n Di
amete
r F
Diam
eter
0 Di
amete
r 1
H,
Ref.
Heigh
t 0,
Re
f. Di
amete
r De
pth
Widt
h Dr
iver
Gagin
g De
pth
[Not
e H
I G
5
INot
e fj)
l [N
ote
Ml
Max
. M
in.
[Note
I3)
l C,
Re
f. [N
ote
I411
M,
Ref.
T
Ref.
N,
Ref.
Size
Max
. M
in.
Max
. M
in.
INote
15
jl 4;
I
0 0.
0600
1
0.07
30
2 0.
0860
3
0.09
90
‘43
0.11
2 0.
096
k 0.
137
0.12
0 '/8
0.
162
0.14
4 '47
0.
187
0.16
7
%a
0.21
2 0.
191
%6
0.23
7 0.
215
%a
0.26
2 0.
238
'/4
0.31
2 0.
285
%6
0.36
2 0.
333
78
0.41
2 0.
380
'h 0.
477
0.44
2 'h
0.59
7 0.
556
g46
0.71
7 0.
670
%
0.76
0 0.
715
=/4
0.81
5 0.
765
. 0.
932
0.87
8 .
. .
1.05
0 0.
990
. 1.
285
1.21
5
0.03
5 0.
021
0.05
6 0.
068
0.04
0 0.
018
0.04
3 0.
025
0.06
8 0.
070
0.04
3 0.
018
0.05
1 0.
029
0.08
0 0.
106
0.06
5 0.
029
0.05
9 0.
033
0.09
2 0.
118
0.07
7 0.
030
0.04
2 0.
024
0.04
7 0.
031
0.04
3 0.
027
0.05
3 0.
035
0.06
2 0.
046
0.05
8 0.
039
0.07
4 0.
058
0.06
4 0.
044
0.07
8 :
0.10
1 g
0.12
4 ii
0.14
8 d
0.06
7 0.
037
0.10
4 0.
130
0.089
0.
030
1 0.
086
0.07
0 0.
069
0.04
8 0.
172
c5
0.07
5 0.
041
0.11
6 0.
152
0.08
0 0.
041
2 0.
074
0.05
6 0.
075
0.05
3 0.
196
2 0.
083
0.04
5 0.
128
0.17
2 0.
100
0.04
1 2
0.09
3 0.
075
0.08
0 0.
057
0.22
0
0.100
0.
052
0.15
2 0.
186
0.11
5 0.
041
2 0.
108
0.090
0.0
91
0.06
6 0.
267
0.11
6 0.
060
0.17
6 0.
202
0.13
2 0.
041
2 0.
125
0.10
7 0.
102
0.07
5 0.
313
0.13
2 0.
068
0.20
0 0.
264
0.14
8 0.
056
3 0.
135
0.11
7 0.
113
0.08
4 0.
362
0.15
3 0.0
79
0.23
2 0.
284
0.16
8 0.
057
0.19
1 0.0
99
0.29
0 0.
384
0.23
2 0.
086
0.23
0 0.
117
0.34
7 0.
404
0.25
3 0.
086
0.22
3 0.
122
0.34
5 0.
416
0.26
5 0.
086
0.15
5 0.
137
0.12
9 0.
095
0.42
4 0.
215
0.19
7 0.
155
0.11
7 0.
539
0.23
5 0.
217
0.18
2 0.
139
0.65
3 0.
247
0.22
9 0.
195
0.15
0 0.
690
0.22
3 0.
131
0.35
4 0.
430
0.28
0 0.
086
4 0.
262
0.24
4 0.
212
0.16
3
0.26
0 0.
150
0.41
0 0.
450
0.30
2 0.
087
4 0.
285
0.26
7 0.
239
0.18
4
0.29
8 0.
169
0.46
7 0.
562
0.32
8 0.
098
5 0.
300
0.27
9 0.
266
0.20
6
0.37
2 0.
206
0.57
8 0.
624
0.39
0 0.
099
5 0.
362
0.34
1 0.
318
0.25
1
0.73
9 0.
851
0.96
2
1.18
6
4 0.
1120
5
0.12
50
6 0.
1380
8 0.
1640
10
0.
1900
12
0.21
60
'14
0.25
00
5/e
0.31
25
"/8
0.37
50
7/,&
j 0.
4375
'1,
0.50
00
g/16
0.
5625
"/8
0.
6250
"/4
0.
7500
GEN
ERAL
NO
TES:
(a
) Fo
r ad
ditio
nal
requ
irem
ents
refe
r to
pa
ra.
2.
lb)
For
refe
renc
e,
see
Tabl
e 4C
Illu
stra
tion
on
prev
ious
page
.
NOTE
S:
(1)
Whe
re
spec
ifyin
g no
min
al
size
in
decim
als,
ze
ros
prec
edin
g de
cimal
an
d in
th
e fo
urth
de
cimal
pl
ace
shal
l be
om
itted
. (2
) Sc
rews
of
th
ese
leng
ths
and
shor
ter
shal
l ha
ve
unde
rcut
he
ads
as
show
n in
Ta
ble
6C.
(3)
Tabu
late
d va
lues
de
term
ined
from
fo
rmula
fo
r m
axim
um
H in
Ap
pend
ix A.
R
(4)
Tabu
late
d va
lues
de
term
ined
from
fo
rmula
fo
r m
axim
um
0 in
Ap
pend
ix A.
3
(5)
No
tole
ranc
e fo
r ga
ging
dia
met
er
is g
iven.
If
the
gagi
ng
diam
eter
of
th
e ga
ge
used
di
ffers
fro
m
tabu
late
d va
lue,
the
prot
rusio
n w
ill be
af
fect
ed
acco
rdin
gly
and
the
prop
er
prot
rusio
n va
lues
m
ust
be
reca
lcula
ted
usin
g th
e fo
rmul
as
show
n in
App
endix
I.
z co
P w
COPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling ServicesCOPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling Services
e -I- M
N
This
typ
e of
re
cess
co
nsis
ts
of
two
inte
rsec
ting
slot
s wi
th
para
llel
side
s co
nver
ging
to
a sli
ghtly
tru
ncat
ed
apex
at
bo
ttom
of
re
cess
.
Edge
of
he
ad
may
be
fla
t or
ro
unde
d
Prot
rusio
n ga
ge
+G4
- -
L,
(see
pa
ra.
2.2)
-4
TABL
E 4D
IL
LUST
RAT
ION
COPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling ServicesCOPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling Services
h 4;
z TA
BLE
4D
DIM
ENSI
ON
S O
F TY
PE
II C
RO
SS
REC
ESSE
D
OVA
L C
OU
NTE
RSU
NK
HEA
D
MAC
HIN
E SC
REW
S Is
Protr
usion
5 m
No
mina
l Siz
e He
ad
Tota
l Ab
ove
Head
s
or
Basic
Sid
e He
ad
Head
Ga
ging
(
Scre
w Le
na
-th
Diam
eter A
Heigh
t Cr
own
Heigh
t Re
cess
Re
cess
Re
cess
Dr
iver
Rece
ss
Pene
tratio
n --
-
Diam
eter
L H,
Re
f. He
iaht
0.
Ref.
Diam
eter
Depth
W
idth
Size
Ga
ging
Depth
-
0
jaging
ti
n Di
amete
r F
Diam
eter
[Note
(6
11
_ ifi
0
INot
e W
I IN
ote
(2))
Max
. M
in.
[Note
(3
)] C,
Re
f. [N
ote
(4))
M,
Ref.
T.
kef.
N,
Ref.
[Note
(5
)] M
ax.
Min.
M
ax.
Min.
[N
ote
(6)]
2
0 0.
0600
1 0.
0730
2
0.08
60
3 0.
0990
4 0.
1120
5
0.12
50
6 0.
1380
8 0.
1640
10
0.
1900
12
0.
2160
‘A,
0.25
00
5/16
0.3
125
“/8
0.37
50
?,6
0.43
75
7,
0.50
00
9/16
0.5
625
5/8
0.62
50
74
0.75
00
0.11
2 0.
096
0.03
5 0.
021
0.05
6 0.
078
0.13
7 0.
120
0.04
3 0.
025
0.06
8 0.
092
0.16
2 0.
144
0.05
1 0.
029
0.08
0 0.
114
0.18
7 0.
167
0.05
9 0.
033
0.09
2 0.
133
0.21
2 0.
191
0.06
7 0.
037
0.10
4 0.
151
0.23
7 0.
215
0.07
5 0.
041
0.11
6 0.
169
0.26
2 0.
238
0.08
3 0.
045
0.12
8 0.
188
0.31
2 0.
285
0.10
0 0.
052
0.15
2 0.
224
0.36
2 0.
333
0.11
6 0.
060
0.17
6 0.
260
0.41
2 0.
380
0.13
2 0.
068
0.20
0 0.
297
0.47
7 0.
442
0.15
3 0.
079
0.23
2 0.
344
0.59
7 0.
556
0.19
1 0.
099
0.29
0 0.
432
0.71
7 0.
670
0.23
0 0.
117
0.34
7 0.
509
0.76
0 0.
715
0.22
3 0.
122
0.34
5 0.
554
0.81
5 0.
765
0.22
3 0.
131
0.35
4 0.
593
0.93
2 0.
878
0.26
0 0.
150
0.41
0 0.
640
1.05
0 0.
990
0.29
8 0.
169
0.46
7 0.
640
1.28
5 1.
215
0.37
2 0.
206
0.57
8 0.
640
0.03
6 0.
021
. 0.
048
0.02
4 0.
060
0.02
7 0.
072
0.03
0
0.08
2 0.
032
. 0.
094
0.03
5 0.
106
0.03
8
0.12
4 0.
043
0.14
8 0.
048
0.17
2 0.
054
0.19
5 0.
061
0.25
2 0.
074
0.30
2 0.
086
0.33
2 0.
092
0.35
8 0.
098
0.38
7 0.
104
0.38
7 0.
104
0.38
7 0.
104
Note
(7
) No
te
(7)
0.04
7 0.
031
Note
(7
) No
te
(7)
0.05
3 0.
035
0.04
0 0.
029
0.05
8 0.
039
0.05
3 0.
041
0.06
4 0.
044
0.06
4 0.
052
0.06
9 0.
048
0.07
7 0.
064
0.07
5 0.
053
0.08
9 0.
075
0.08
0 0.
057
0.11
3 0.0
99
0.09
1 0.
066
0.26
7 0.
137
0.12
2 0.
102
0.07
5 0.
313
0.16
2 0.
145
0.11
3 0.
084
0.36
2
0.19
3 0.
176
0.12
9 0.
095
0.42
4 0.
251
0.23
2 0.
155
0.11
7 0.
539
0.30
3 0.
281
0.18
2 0.
139
0.65
3 0.
332
0.31
0 0.
195
0.15
0 0.
690
0.359
0.
335
0.21
2 0.
163
0.73
9 0.3
89
0.36
4 0.
239
0.18
4 0.
851
0.389
0.
364
0.26
6 0.
206
0.96
2 0.3
89
0.36
4 0.
318
0.25
1 1.
186
Y 0.
078
z 0.
101
Ill
0.12
4 g
0.14
8 g z
0.17
2 0.
196
E
0.22
0 2
GEN
ERAL
NO
TES:
(a
) Fo
r ad
ditio
nal
requ
irem
ents
refe
r to
pa
ra.
2.
(b)
For
refe
renc
e,
see
Tabl
e 4D
Illu
stra
tion
on
prev
ious
page
.
NOTE
S:
(1)
Whe
re
spec
ifyin
g no
min
al
size
in
decim
als,
ze
ros
prec
edin
g de
cimal
an
d in
th
e fo
urth
de
cimal
pl
ace
shal
l be
om
itted
, (2
) Sc
rews
of
th
ese
leng
ths
and
shor
ter
shal
l ha
ve
unde
rcut
he
ads
as
show
n in
Ta
ble
6D.
(3)
Tabu
late
d va
lues
de
term
ined
from
fo
rmula
fo
r m
axim
um
H in
Ap
pend
ix A.
(4
) Ta
bula
ted
valu
es
dete
rmine
d fro
m
form
ula
for
max
imum
0
in
Appe
ndix
A.
D m
(5)
Poin
t sa
me
on
all
drive
rs.
2 (6
) No
to
lera
nce
for
gagi
ng
diam
eter
is
give
n.
If th
e ga
ging
dia
met
er
of
the
gage
us
ed
diffe
rs
from
ta
bula
ted
value
, th
e pr
otru
sion
will
be
affe
cted
ac
cord
ingl
y an
d th
e pr
oper
pr
otru
sion
valu
es
mus
t be
re
calcu
late
d us
ing
the
form
ulas
sh
own
in
Appe
ndix
I.
g
(7)
Not
prac
tical
to
ga
ge.
m
P w I, iz
COPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling ServicesCOPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling Services
STDOASME BLB.b.3-ENGL L778 m 0757670 Ob14200 8 T T W
ASME 618.631998 MACHINE SCREWS AND MACHINE SCREW NUTS
Protrusion gage
TABLE 5A DIMENSIONS OF SLOTTED UNDERCUT FLAT COUNTERSUNK HEAD MACHINE SCREWS
Protrusion Above Nominal Size
or Basic Screw Length Diameter Height Width Depth Diameter F Diameter
Diameter L [Note ( I ) ] [Note (2)] Max. Min. Max. Min. Max. Min. Max. Min. Max. Min. [Note (311
O 0.0600 '18 0.112 0.096 0.025 0.018 0.023 0.016 0.011 0.007 Note (4) Note (4) Note (4) 1 0.0730 '18 0.137 0.120 0.031 0.023 0.026 0.019 0.014 0.009 Note (4) Note (4) Note (4) 2 0.0860 '/R 0.162 0.144 0.036 0.028 0.031 0.023 0.016 0.011 0.029 0.017 0.124
Head Head Slot Slot Gaging Gaging
A H J T [Note (311 G
3 0.0990 'h 0.187 0.167 0.042 0.033 0.035 0.027 0.019 0.012 0.031 0.018 0.148
4 0.1120 3/16 0.212 0.191 0.047 0.038 0.039 0.031 0.022 0.014 0.032 0.019 0.172 5 0.1250 3/16 0.237 0.215 0.053 0.043 0.043 0.035 0.024 0.016 0.034 0.020 0.196 6 0.1380 0.262 0.238 0.059 0.048 0.048 0.039 0.027 0.017 0.036 0.021 0.220
8 0.1640 '14 0.312 0.285 0.070 0.058 0.054 0.045 0.032 0.021 0.039 0.023 0.267
12 0.2160 "* 0.412 0.380 0.092 0.078 0.067 0.056 0.043 0.028 0.045 0.027 0.362
'/4 0.2500 '/16 0.477 0.442 0.107 0.092 0.075 0.064 0.050 0.032 0.050 0.029 0.424 5/16 0.3125 'h 0.597 0.556 0.134 0.116 0.084 0.072 0.062 0.041 0.057 0.034 0.539
0.3750 9/16 0.717 0.670 0.161 0.140 0.094 0.081 0.075 0.049 0.065 0.039 0.653 0.4375 v* 0.760 0.715 0.156 0.133 0.094 0.081 0.072 0.045 0.073 0.044 0.690
'/* 0.5000 14 0.815 0.765 0.156 0.130 0.106 0.091 0.072 0.046 0.081 0.049 0.739
10 0.1900 0.362 0.333 0.081 0.068 0.060 0.050 0.037 0.024 0.042 0.025 0.313
GENERAL NOTE: For additional requirements refer to para. 2. NOTES: (1) Where specifying nominal size in decimals, zeros preceding decimal and in the fourth decimal place shall be omitted. (2) Screws of these lengths and shorter are undercut. Screws of longer lengths shall have head heights as shown in Table 1A. (3) No tolerance for gaging diameter is given. If the gaging diameter of the gage used differs from tabulated value, the protrusion
will be affected accordingly and the proper protrusion values must be recalculated using the formulas shown in Appendix I. (4) Not practical to gage.
28
COPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling ServicesCOPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling Services
This
ty
pe
of
WCB
SS
has
a la
rge
cent
er
open
ing.
tape
red
win
gs.
and
blunt
bo
nom
, wi
th
all
edge
s re
lieve
d or
ro
unde
d
Prot
rusio
n ga
ge
TABL
E 5B
D
IMEN
SIO
NS
OF
TYPE
I
CR
OSS
R
ECES
SED
U
ND
ERC
UT
FLAT
C
OU
NTE
RSU
NK
HEA
D
MAC
HIN
E SC
REW
S
Nom
inal
Si
ze
or
Basi
c Sc
rew
Diam
eter
Le
ngth
1
Head
He
ad
Diam
eter
He
ight
A
H
Rece
ss
Prot
rusio
n Ab
ove
Rece
ss
Rece
ss
Rece
ss
Pene
tratio
n G
aging
Di
amet
er
Gag
ing
Diam
eter
Di
amet
er
Dept
h W
idth
Dr
iver
Gag
ing
Dept
h F
[Not
e (3
11
G
[Not
e 11
)l [N
ote
WI
Max
. M
in.
Max
. M
in.
M,
Ref.
T, R
ef.
N,
Ref.
Size
M
ax.
Min.
M
ax.
Min.
[N
ote
(311
0.11
2 0.
096
0.02
5 0.
018
0.06
2 0.
035
0.01
4 0.
137
0.12
0 0.
031
0.02
3 0.
070
0.04
3 0.
015
0.16
2 0.
144
0.03
6 0.
028
0.08
8 0.
048
0.01
7 0.
187
0.16
7 0.
042
0.03
3 0.
096
0.05
5 0.
018
0.03
6 0.
020
Note
(4
) No
te
(4)
Note
(4
) 0.
044
0.02
8 No
te
(4)
Note
(4
) No
te
(4)
0.04
9 0.
033
0.02
9 0.
017
0.12
4 0.
056
0.04
0 0.
031
0.01
8 0.
148
0 0.
0600
1
0.07
30
2 0.
0860
3
0.09
90
4 0.
1120
5
0.12
50
6 0.
1380
0.21
2 0.
191
0.04
7 0.
038
0.110
0.
070
0.01
8 I
0.07
1 0.
055
0.03
2 0.
019
0.17
2 0.
237
0.21
5 0.
053
0.04
3 0.
122
0.08
1 0.
018
1 0.
082
0.06
6 0.
034
0.02
0 0.
196
0.26
2 0.
238
0.05
9 0.
048
0.14
0 0.
066
0.02
5 2
0.06
7 0.
044
0.03
6 0.
021
0.22
0
8 0.
1640
10
0.19
00
12
0.21
60
0.31
2 0.
285
0.07
0 0.
058
0.16
8 0.0
94
0.02
9 2
0.09
5 0.
072
0.03
9 0.
023
0.26
7 0.
362
0.33
3 0.
081
0.06
8 0.
182
0.110
0.
030
2 0.
110
0.08
7 0.
042
0.02
5 0.
313
0.41
2 0.
380
0.09
2 0.
078
0.22
6 0.1
10
0.03
0 3
0.10
4 0.
081
0.04
5 0.
027
0.36
2
‘/4
0.25
00
‘/,s
0.31
25
3/a
0.37
50
‘/,a
0.43
75
‘/*
0.50
00
0.47
7 0.
442
0.10
7 0.
092
0.24
4 0.
124
0.03
2 0.
597
0.55
6 0.
134
0.11
6 0.
310
0.15
7 0.
053
0.71
7 0.
670
0.16
1 0.
140
0.35
8 0.
205
0.06
1 0.
760
0.71
5 0.
156
0.13
3 0.
386
0.23
4 0.
065
0.81
5 0.
765
0.15
6 0.
130
0.40
2 0.
252
0.06
8
0.11
9 0.
096
0.05
0 0.
029
0.42
4 0.
148
0.12
6 0.
057
0.03
4 0.
539
0.19
6 0.
174
0.06
5 0.
039
0.65
3 0.
225
0.20
3 0.
073
0.04
4 0.
690
0.24
1 0.
219
0.08
1 0.
049
0.73
9
GEN
ERAL
NO
TE:
For
addi
tiona
l re
quire
men
ts re
fer
to
para
. 2.
NOTE
S:
(1)
Whe
re
spec
ifyin
g no
min
al
size
in
decim
als,
ze
ros
prec
edin
g de
cimal
an
d in
th
e fo
urth
de
cimal
pl
ace
shal
l be
om
itted
. (2
) Sc
rews
of
th
ese
leng
ths
and
shor
ter
are
unde
rcut
. Sc
rews
of
lon
ger
leng
ths
shal
l ha
ve
head
he
ight
s as
sh
own
in
Tabl
e 18
. R
(3)
No
tole
ranc
e fo
r ga
ging
dia
met
er
is
given
. If
the
gagi
ng
diam
eter
of
th
e ga
ge
used
di
ffers
fro
m
tabu
late
d va
lue,
the
prot
rusio
n w
ill be
af
fect
ed
acco
rdin
gly
and
the
5
prop
er
prot
rusio
n va
lues
m
ust
be
reca
lcula
ted
usin
g th
e fo
rmul
as
show
n in
Ap
pend
ix I.
W
(4)
Not
prac
tical
to
ga
ge.
Fo
0,
COPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling ServicesCOPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling Services
This
ty
pe
of
rece
sS
has
a la
rge
cent
er
open
ing,
wide
st
raig
ht
win
gs,
and
blunt
bo
ttom
, wi
th
all
edge
s re
lieve
d or
ro
unde
d.
TABL
E 5C
D
IMEN
SIO
NS
OF
TYPE
IA
CR
OSS
R
ECES
SED
U
ND
ERC
UT
FLAT
C
OU
NTE
RSU
NK
HEA
D
MAC
HIN
E SC
REW
S
Nom
inal
Si
ze
Head
He
ad
Rece
ss
Prot
rusio
n Ab
ove
or
Basi
c Sc
rew
Leng
th
Diam
eter
He
ight
Pe
netra
tion
Gag
ing
Diam
eter
G
aging
Diam
eter
(Not
: (2
11
A H
Rece
ss
Rece
ss
Rece
ss
Diam
eter
Di
amet
er
Dept
h W
idth
Dr
iver
Gag
ing
Dept
h F
[Not
e (3
)] G
INot
e W
I M
ax.
Min.
M
ax.
Min.
M
, Re
f. T,
Ref
. N,
Re
f. Si
ze
Max
. M
in.
Max
. M
in.
[Not
e (3
11
0 0.0
600
'/8
0.112
0.0
96
0.025
0.0
18
0.062
0.0
36
0.018
Cl
0.0
37
0.021
No
te (4
) No
te (4
) No
te (4
)
1 0.0
730
'4 0.1
37
0.120
0.0
31
0.023
0.0
70
0.044
0.0
18
0 0.0
45
0.029
No
te (4
) No
te (4
) No
te (4
)
2 0.0
860
'h 0.1
62
0.144
0.0
36
0.028
0.0
88
0.048
0.0
28
1 0.0
46
0.030
0.0
29
0.017
0.1
24
3 0.0
990
'4 0.1
87
0.167
0.0
42
0.033
0.0
96
0.055
0.0
29
1 0.0
53
0.037
0.0
31
0.018
0.1
48
4 0.1
120
3/6
0.212
0.1
91
0.047
0.0
38
0.110
0.0
70
0.029
1
0.068
0.0
52
0.032
0.0
19
0.172
5 0.1
250
3/6
0.237
0.2
15
0.053
0.0
43
0.122
0.0
81
0.030
1
0.079
0.0
63
0.034
0.0
20
0.196
6 0.1
380
%5
0.262
0.2
38
0.059
0.0
48
0.140
0.0
69
0.040
2
0.063
0.0
45
0.036
0.0
21
0.220
8 0.1
640
'A
0.312
0.2
85
0.070
0.0
58
0.168
0.0
98
0.041
2
0.091
0.0
73
0.039
0.0
23
0.267
10
0.
1900
%
6 0.3
62
0.333
0.0
81
0.068
0.1
82
0.112
0.0
41
2 0.1
07
0.089
0.0
42
0.025
0.3
13
6
12
0.216
0 %
0.4
12
0.380
0.0
92
0.078
0.2
26
0.112
0.0
55
3 0.1
00
0.082
0.0
45
0.027
0.3
62
2 2 Ill
'/4
0.250
0 %
s 0.4
77
0.442
0.1
07
0.092
0.2
42
0.128
0.0
56
3 0.1
15
0.097
0.0
50
0.029
0.4
24
5/,6
0.3
125
5;
0.597
0.5
56
0.134
0.1
16
0.310
g
0.163
0.0
85
4 0.1
45
0.127
0.0
57
0.034
0.5
39
"/8
0.375
0 %
6 0.7
17
0.670
0.1
61
0.140
0.3
58
0.211
0.0
86
4 0.1
93
0.175
0.0
65
0.039
0.6
53
;
'/16
%
z 0.4
375
0.760
0.7
15
0.156
0.1
33
0.386
0.2
39
0.086
4
0.222
0.2
04
0.073
0.0
44
0.690
'/*
0.500
0 sh
0.8
15
0.765
0.1
56
0.130
0.4
02
0.256
0.0
86
4 0.2
38
0.220
0.0
81
0.049
0.7
39
I: z
GENE
RAL
NOTE
: Fo
r ad
dition
al re
quire
men
ts re
fer
to
para
. 2.
z
NOTE
S:
(1)
Whe
re sp
ecify
ing
nom
inal
size
in de
cimals
, ze
ros
prece
ding
decim
al an
d in
the
fourth
de
cimal
place
sh
all
be
omitte
d.
s
(2)
Scre
ws
of
these
len
gths
and
shor
ter
are
unde
rcut.
Scre
ws
of
longe
r len
gths
shall
ha
ve
head
he
ights
as
show
n in
Table
IC
. z
(3)
No
tolera
nce
for
gagin
g dia
mete
r is
given
. If
the
gagin
g dia
mete
r of
the
ga
ge
used
dif
fers
from
tab
ulated
va
lue,
the
protru
sion
will
be
affec
ted
acco
rding
ly an
d the
u)
pro
per
protru
sion
value
s m
ust
be
recalc
ulated
us
ing
the
form
ulas
show
n in
Appe
ndix
I. (4
) No
t pr
actic
al to
ga
ge.
s:
zz
E 2
COPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling ServicesCOPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling Services
TABL
E 5D
D
IMEN
SIO
NS
OF
TYPE
II
CR
OSS
R
ECES
SED
U
ND
ERC
UT
FLAT
C
OU
NTE
RSU
NK
HEA
D
MAC
HIN
E SC
REW
S 2 c/
7 No
mina
l Siz
e He
ad
Head
Pr
otrus
ion
Abov
e
Diam
eter
Heigh
t Re
cess
Pe
netra
tion
Gagin
g Di
amete
r Ga
ging
s
or
Basic
Sc
rew
Leng
th Re
cess
Re
cess
Re
cess
Dr
iver
Diam
eter
r” Di
amete
r L
A H
Diam
eter
Depth
W
idth
Size
Gagin
g De
pth
F [N
ote
(411
G
z
[Not
e (1
11
0 0.0
600
1 0.0
730
2 0.0
860
3 0.0
990
[Note
(2
)] M
ax.
Min.
M
ax.
Min.
M
, Re
f. J.
Ref.
N,
Re
f. [N
ote
(311
M
ax.
Min.
M
ax.
Min.
[N
ote
(411
5 c/
l ‘/8
0.1
12
0.096
0.0
25
0.018
‘47
0.1
37
0.120
0.0
31
0.023
‘43
0.1
62
0.144
0.0
36
0.028
‘18
0.187
0.1
67
0.042
0.0
33
0.067
0.0
29
0.082
0.0
39
0.100
0.0
50
0.111
0.0
58
0.020
0.022
0.025
0.026
.
Note
(5)
Note
(5)
Note
(5)
Note
(5)
Note
(5)
Note
(5)
Note
(5)
Note
(5)
Note
(5)
Note
(5)
0.030
0.0
20
0.029
0.0
17
0.124
0.038
0.0
27
0.031
0.0
18
0.148
4 0.1
120
%s
0.212
0.1
91
0.047
0.0
38
0.129
0.0
70
5 0.1
250
34s
0.237
0.2
15
0.053
0.0
43
0.147
0.0
80
6 0.1
380
3/s
0.262
0.2
38
0.059
0.0
48
0.161
0.0
88
8 0.1
640
‘4 0.3
12
0.285
0.0
70
0.058
0.1
97
0.112
10
0.190
0 %
6 0.3
62
0.333
0.0
81
0.068
0.2
36
0.132
12
0.216
0 %
0.4
12
0.380
0.0
92
0.078
0.2
60
0.148
l/4
0.250
0 ‘46
0.4
77
0.442
0.1
07
0.092
0.3
04
0.169
%6
0.312
5 ‘12
0.5
97
0.556
0.1
34
0.116
0.3
81
0.218
“/8
0.375
0 g/
6 0.7
17
0.670
0.1
61
0.140
0.4
53
0.266
‘/,c
0.437
5 “h
0.7
60
0.715
0.1
56
0.133
0.4
98
0.295
‘/>
0.500
0 “/a
0.8
15
0.765
0.1
56
0.130
0.5
48
0.328
0.029
0.032
0.034
0.050
0.0
38
0.032
0.0
19
0.172
0.062
0.0
50
0.034
0.0
20
0.196
0.071
0.0
59
0.036
0.0
21
0.220
0.039
0.045
0.048
.
. .
0.095
0.0
82
0.039
0.0
23
0.267
0.121
0.1
07
0.042
0.0
25
0.313
0.137
0.1
22
0.045
0.0
27
0.362
0.054
.
. .
0.066
0.077
0.083
0.090
0.167
0.1
50
0.050
0.0
29
0.424
0.218
0.1
98
0.057
0.0
34
0.539
0.266
0.2
44
0.065
0.0
39
0.653
0.296
0.2
73
0.073
0.0
44
0.690
0.329
0.3
05
0.081
0.0
49
0.739
GENE
RAL
NOTE
: Fo
r ad
dition
al re
quire
men
ts re
fer
to
para
. 2.
NOTE
S:
(1)
Whe
re sp
ecify
ing
nom
inal
size
in de
cimals
, ze
ros
prece
ding
decim
al an
d in
the
fourth
de
cimal
place
sh
all
be
omitte
d.
(2)
Scre
ws
of
these
len
gths
and
shor
ter
are
unde
rcut.
Scre
ws
of
longe
r len
gths
shall
ha
ve
head
he
ights
as
show
n in
Table
ID
. R
7
(3)
Point
sa
me
on
all
drive
rs.
(4)
No
tolera
nce
for
gagin
g dia
mete
r is
given
. If
the
gagin
g dia
mete
r of
the
ga
ge
used
dif
fers
from
tab
ulated
va
lue,
the
protru
sion
will
be
affec
ted
acco
rding
ly an
d the
2 m
prope
r pro
trusio
n va
lues
mus
t be
rec
alcula
ted
using
the
for
mula
s sh
own
in Ap
pend
ix I.
(5)
Not
prac
tical
to
gage
.
COPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling ServicesCOPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling Services
Q
/- Pr
otru
sion
gage
L-04
(s
ee
para
. 2.
2)
TABL
E 6A
D
IMEN
SIO
NS
OF
SLO
TTED
U
ND
ERC
UT
OVA
L C
OU
NTE
RSU
NK
HEA
D
MAC
HIN
E SC
REW
S
Head
He
ad
Tota
l Pr
otru
sion
Abov
e
Nom
inal
Si
ze
Side
Head
He
ad
Slot
Sl
ot
Gagin
g Di
amete
r
or
Basic
Sc
rew
Leng
th
Diam
eter
Heigh
t Cr
own
Heigh
t W
idth
De
pth
F Ga
ging
Diam
eter
Diam
eter
[Not
: (Z
)]
A H,
Re
f. He
ight
0 J
T [N
ote
(411
G
[Not
e (1
)I
Max
. M
in.
[Note
(31
1 C,
Re
f. M
ax.
Min.
M
ax.
Min.
M
ax.
Min.
M
ax.
Min.
[N
ote
(411
is
0 0.0
600
‘/8
0.112
0.
096
0.025
0.0
21
0.046
0.0
33
0.023
0.0
16
0.028
0.0
22
0.047
0.0
31
0.078
1 0.0
730
‘h
0.137
0.1
20
0.031
0.0
25
0.056
0.0
42
0.026
0.
019
0.034
0.0
27
0.053
0.0
35
0.10
1
2 0.0
860
I/,
0.162
0.1
44
0.036
0.
029
0.065
0.0
50
0.031
0.0
23
0.040
0.0
33
0.058
0.
039
0.124
3 0.
0990
l/B
0.1
87
0.167
0.0
42
0.033
0.0
75
0.05
9 0.0
35
0.027
0.0
47
0.038
0.0
64
0.044
0.1
48
4 0.1
120
%6
0.212
0.
191
0.047
0.0
37
0.084
0.0
67
0.03
9 0.0
31
0.053
0.0
43
0.06
9 0.0
48
0.172
5
0.125
0 3/
16
0.237
0.2
15
0.053
0.0
41
0.09
4 0.0
76
0.043
0.0
35
0.05
9 0.0
48
0.075
0.0
53
0.19
6 I
6 0.1
380
%6
0.262
0.2
38
0.05
9 0.0
45
0.104
0.0
84
0.048
0.
039
0.065
0.0
53
0.080
0.0
57
0.220
q 2 m
8
0.164
0 ‘4
0.3
12
0.285
0.0
70
0.052
0.1
23
0.10
1 0.0
54
0.045
0.0
78
0.064
0.
091
0.066
0.2
67
10
0.19
00
%6
0.362
0.3
33
0.081
0.0
60
0.142
0.1
18
0.060
0.0
50
0.09
0 0.0
74
0.102
0.0
75
0.313
K
12
0.216
0 7s
0.4
12
0.380
0.
092
0.068
0.1
61
0.135
0.0
67
0.056
0.1
03
0.085
0.1
13
0.084
0.3
62
ii s cn
‘/a
0.250
0 %
6 0.4
77
0.442
0.1
07
0.07
9 0.1
86
0.158
0.0
75
0.064
0.
119
0.09
8 0.
129
0.09
5 0.4
24
& 0.3
125
‘h
0.59
7 0.5
56
0.134
0.
099
0.232
0.
198
0.084
0.0
72
0.14
9 0.1
24
0.155
0.1
17
0.539
P
“/8
o 0.3
750
9/s
0.717
0.6
70
0.161
0.1
17
0.278
0.2
39
0.09
4 0.0
81
0.179
0.1
49
0.182
0.1
39
0.653
%6
0.437
5 78
0.7
60
0.715
0.1
56
0.122
0.2
79
0.239
0.
094
0.081
0.1
84
0.154
0.1
95
0.150
0.
690
5
‘/2
0.500
0 “4
0.8
15
0.765
0.1
56
0.131
0.2
88
0.244
0.1
06
0.09
1 0.2
04
0.169
0.2
12
0.163
0.7
39
9 2
GEN
ERAL
NO
TE:
For
addi
tiona
l re
quire
men
ts re
fer
to
para
. 2.
m
NOTE
S:
t?
(1)
Whe
re
spec
ifyin
g no
min
al
size
in
decim
als,
ze
ros
prec
edin
g de
cimal
an
d in
th
e fo
urth
de
cimal
pl
ace
shal
l be
om
itted
. R
(2)
Scre
ws
of
thes
e le
ngth
s an
d sh
orte
r ar
e un
derc
ut.
Scre
ws
of
longe
r le
ngth
s sh
all
have
he
ad
heig
hts
as
show
n in
Ta
ble
4A.
d
(3)
Tabu
late
d va
lues
de
term
ined
from
fo
rmula
fo
r m
axim
um
H in
Ap
pend
ix A.
(4
) No
to
lera
nce
for
gagi
ng
diam
eter
is
giv
en.
If th
e ga
ging
dia
met
er
of
the
gage
us
ed
diffe
rs
from
ta
bula
ted
value
, th
e pr
otru
sion
will
be
affe
cted
ac
cord
ingl
y an
d th
e z
prop
er
prot
rusio
n va
lues
m
ust
be
reca
lcula
ted
usin
g th
e fo
rmul
as
show
n in
Ap
pend
ix I.
-J
COPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling ServicesCOPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling Services
This
typ
e of
re
cess
ha
s a
larg
e ce
nter
op
enin
g,
tape
red
wing
s,
and
blun
t bo
ttom
, wi
th
all
edge
s re
lieve
d or
ro
unde
d.
k -I
(see
pk
a.
2.2)
Prot
rusio
n ga
ge
be
TABL
E 6B
D
IMEN
SIO
NS
OF
TYPE
I
CR
OSS
R
ECES
SED
U
ND
ERC
UT
OVA
L C
OU
NTE
RSU
NK
HEA
D
MAC
HIN
E SC
REW
S
Nom
inal
Si
ze
Head
Re
cess
Pr
otru
sion
or
Basi
c He
ad
Side
He
ad
Tota
l Pe
netra
tion
Abov
e G
aging
G
aging
Sc
rew
Leng
th
Diam
eter
He
ight
Cr
own
Head
He
ight
Re
cess
Re
cess
Re
cess
G
aging
Di
amet
er
F Di
amet
er
Diam
eter
(N
ot:
(Z)]
Max
.
A H.
Re
f. He
ight
0
Diam
eter
De
pth
Wid
th
Drive
r De
pth
[Not
e (4
)) G
[Not
e (1
11
Min.
[N
ote
(311
C,
Re
f. M
ax.
Min.
M
. Re
f. T,
Ref
. N,
Re
f. Si
ze
Max
. M
in.
Max
. M
in.
[Not
e (4
11
cl
0 0.
0600
‘4
3 0.
112
0.09
6 0.
025
0.02
1 0.
046
0.03
3 0.
068
0.03
6 0.
014
0 0.
038
0.02
0 0.
047
0.03
1 0.
078
1 0.
0730
‘/B
0.
137
0.12
0 0.
031
0.02
5 0.
056
0.04
2 0.
070
0.03
9 0.
015
0 0.
041
0.02
3 0.
053
0.03
5 0.
101
2 0.
0860
‘1
s 0.
162
0.14
4 0.
036
0.02
9 0.
065
0.05
0 0.
106
0.06
0 0.
018
1 0.
062
0.04
5 0.
058
0.03
9 0.
124
3 0.
0990
‘/8
0.
187
0.16
7 0.
042
0.03
3 0.
075
0.05
9 0.
118
0.07
2 0.
019
1 0.
074
0.05
7 0.
064
0.04
4 0.
148
4 0.
1120
3/
s 0.
212
0.19
1 0.
047
0.03
7 0.
084
0.06
7 0.
130
0.08
6 0.
019
1 0.
087
0.07
0 0.
069
0.04
8 0.
172
5 0.
1250
%
6 0.
237
0.21
5 0.
053
0.04
1 0.
094
0.07
6 0.
152
0.07
3 0.
028
2 0.
074
0.05
0 0.
075
0.05
3 0.
196
6 0.
1380
%
6 0.
262
0.23
8 0.
059
0.04
5 0.
104
0.08
4 0.
172
0.09
2 0.
030
2 0.
094
0.06
9 0.
080
0.05
7 0.
220
8 0.
1640
‘/4
0.
312
0.28
5 0.
070
0.05
2 0.
123
0.10
1 0.
186
0.10
7 0.
031
2 0.
108
0.08
4 0.
091
0.06
6 0.
267
10
0.19
00
%5
0.36
2 0.
333
0.08
1 0.
060
0.14
2 0.
118
0.20
2 0.
125
0.03
3 2
0.12
6 0.
102
0.10
2 0.
075
0.31
3 12
0.
2160
%
0.
412
0.38
0 0.
092
0.06
8 0.
161
0.13
5 0.
264
0.14
0 0.
038
3 0.
135
0.11
1 0.
113
0.08
4 0.
362
‘/4
0.25
00
‘45
0.47
7 0.
442
0.10
7 0.
079
0.18
6 0.
158
0.28
4 0.
160
0.04
0 3
0.15
6 0.
131
0.12
9 0.
095
0.42
4 5/
,6
0.31
25
‘4
0.59
7 0.
556
0.13
4 0.
099
0.23
2 0.
198
0.37
4 0.
214
0.06
4 4
0.20
6 0.
182
0.15
5 0.
117
0.53
9 “/g
0.
3750
%
6 0.
717
0.67
0 0.
161
0.11
7 0.
278
0.23
9 0.
394
0.23
3 0.
066
4 0.
225
0.20
1 0.
182
0.13
9 0.
653
‘/6
0.43
75
7s
0.76
0 0.
715
0.15
6 0.
122
0.27
9 0.
239
0.40
4 0.
245
0.06
8 4
0.23
7 0.
213
0.19
5 0.
150
0.69
0 ‘/p
0.
5000
‘4
0.
815
0.76
5 0.
156
0.13
1 0.
288
0.24
4 0.
416
0.25
7 0.
070
4 0.
249
0.22
5 0.
212
0.16
3 0.
739
GEN
ERAL
NO
TE:
For
addi
tiona
l re
quire
men
ts re
fer
to
para
. 2.
NOTE
S:
(1)
Whe
re
spec
ifyin
g no
min
al
size
in
decim
als,
ze
ros
prec
edin
g de
cimal
an
d in
th
e fo
urth
de
cimal
pl
ace
shal
l be
om
itted
. (2
) Sc
rews
of
th
ese
leng
ths
and
shor
ter
are
unde
rcut
, Sc
rews
of
lon
ger
leng
ths
shal
l ha
ve
head
he
ight
s as
sh
own
in
Tabl
e 48
. (3
) Ta
bula
ted
valu
es
dete
rmine
d fro
m
form
ula
for
max
imum
H
in
Appe
ndix
A.
(4)
No
tole
ranc
e fo
r ga
ging
dia
met
er
is
given
, If
the
gagi
ng
diam
eter
of
th
e ga
ge
used
di
ffers
fro
m
tabu
late
d va
lue,
the
prot
rusio
n w
ill be
af
fect
ed
acco
rdin
gly
and
the
prop
er
prot
rusio
n va
lues
m
ust
be
reca
lcula
ted
usin
g th
e fo
rmul
as
show
n in
Ap
pend
ix 1.
COPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling ServicesCOPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling Services
This
typ
e of
re
cess
ha
s a
larg
e ce
nter
op
enin
g,
wide
st
raig
ht
wing
s,
and
blun
t bo
ttom
, wi
th
all
edge
s re
lieve
d or
ro
unde
d.
I- 4
(see
pk
a.
2.2)
A-
Edge
of
he
ad
may
be
fla
t or
ro
unde
d
Prot
rusio
n ga
ge
TABL
E 6C
D
IMEN
SIO
NS
OF
TYPE
IA
CR
OSS
R
ECES
SED
U
ND
ERC
UT
OVA
L C
OU
NTE
RSU
NK
HEA
D
MAC
HIN
E SC
REW
S
Nom
inal
Si
ze
or
Basi
c Sc
rew
Diam
eter
Head
Re
cess
Pr
otru
sion
Head
Si
de
Head
To
tal
Pene
tratio
n Ab
ove
Gag
ing
Diam
eter
He
ad
Heig
ht
Gag
ing
Diam
eter
f
Gag
ing
Leng
th
Heig
ht
Crow
n Di
amet
er
L A
H.
Ref.
Heia
ht
0 Re
cess
Re
cess
Re
cess
Di
amet
er
Dept
h W
idth
Dr
iver
Dept
h [N
ote
(411
G
[Not
e (Il
l [N
ote
(2)]
Max
. M
in.
[N&e
(3
)] C,
Re
f. M
ax.
Min.
M
, Re
f. T,
Ref
. N,
Re
f. Si
ze
Max
. M
in.
Max
. M
in.
[Not
e (4
11
E 0
0.06
00
‘b
0.11
2 0.
096
0.02
5 0.
021
0.04
6 0.
033
0.06
8 0.
040
0.01
8 0
0.04
0 0.
024
0.04
7 0.
031
0.07
8 1
0.07
30
‘h
0.13
7 0.
120
0.03
1 0.
025
0.05
6 0.
042
0.07
0 0.
043
0.01
8 0
0.04
3 0.
027
0.05
3 0.
035
0.10
1 2
0.08
60
‘h
0.16
2 0.
144
0.03
6 0.
029
0.06
5 0.
050
0.10
6 0.
065
0.02
9 1
0.06
2 0.
046
0.05
8 0.
039
0.12
4 3
0.09
90
‘43
0.18
7 0.
167
0.04
2 0.
033
0.07
5 0.
059
0.11
8 0.
077
0.03
0 1
0.07
4 0.
058
0.06
4 0.
044
0.14
8
4 0.
1120
%
6 0.
212
0.19
1 0.
047
0.03
7 0.
084
0.06
7 0.
130
0.08
9 0.
030
1 0.
086
0.07
0 0.
069
0.04
8 0.
172
5 0.
1250
3/
s 0.
237
0.21
5 0.
053
0.04
1 0.
094
0.07
6 0.
152
0.08
0 0.
041
2 0.
074
0.05
6 0.
075
0.05
3 0.
196
5
6 0.
1380
34
6 0.
262
0.23
8 0.
059
0.04
5 0.
104
0.08
4 0.
172
0.10
0 0.
041
2 0.
093
0.07
5 0.
080
0.05
7 0.
220
2 zj m
8 0.
1640
‘1
4 0.
312
0.28
5 0.
070
0.05
2 0.
123
0.10
1 0.
186
0.11
5 0.
041
2 0.
108
0.09
0 0.
091
0.06
6 0.
267
10
0.19
00
5/16
0.
362
0.33
3 0.
081
0.06
0 0.
142
0.11
8 0.
202
0.13
2 0.
041
2 0.
125
0.10
7 0.
102
0.07
5 0.
313
Fi
12
0.21
60
“18
0.41
2 0.
380
0.09
2 0.
068
0.16
1 0.
135
0.26
4 0.
148
0.05
6 3
0.13
5 0.
117
0.11
3 0.
084
0.36
2 ii z 0-
l ‘A
, 0.
2500
%
6 0.
477
0.44
2 0.
107
0.07
9 0.
186
0.15
8 0.
284
0.16
8 0.
057
3 0.
155
0.13
7 0.
129
0.09
5 0.
424
5/6
0.31
25
%
0.59
7 0.
556
0.13
4 0.
099
0.23
2 0.
198
0.37
4 0.
223
0.08
6 4
0.20
5 0.
187
0.15
5 0.
117
0.53
9 “/8
0.
3750
9/
s 2
0.71
7 0.
670
0.16
1 0.
117
0.27
8 0.
239
0.39
4 0.
243
0.08
6 4
0.22
5 0.
207
0.18
2 0.
139
0.65
3 %
6 0.
4375
%
I z
0.76
0 0.
715
0.15
6 0.
122
0.27
9 0.
239
0.40
4 0.
253
0.08
6 4
0.23
5 0.
217
0.19
5 0.
150
0.69
0
‘/2
0.50
00
“14
0.81
5 0.
765
0.15
6 0.
131
0.28
8 0.
244
0.41
6 0.
265
0.08
6 4
0.24
7 0.
229
0.21
2 0.
163
0.73
9 5
GEN
ERAL
NO
TE:
For
addi
tiona
l re
quire
men
ts re
fer
to
para
. 2.
FE
NOTE
S:
:: (1
) W
here
sp
ecify
ing
nom
inal
siz
e in
de
cimal
s,
zero
s pr
eced
ing
decim
al
and
in
the
four
th
decim
al
plac
e sh
all
be
omitt
ed.
A (2
) Sc
rews
of
th
ese
leng
ths
and
shor
ter
are
unde
rcut
. Sc
rews
of
lon
ger
leng
ths
shal
l ha
ve
head
he
ight
s as
sh
own
in
Tabl
e 4C
. s
(3)
Tabu
late
d va
lues
de
term
ined
from
fo
rmula
fo
r m
axim
um
H in
Ap
pend
ix A.
2
(4)
No
tole
ranc
e fo
r ga
ging
dia
met
er
is g
iven.
If
the
gagi
ng
diam
eter
of
th
e ga
ge
used
di
ffers
fro
m
tabu
late
d va
lue,
the
prot
rusio
n w
ill be
af
fect
ed
acco
rdin
gly
and
the
5 pr
oper
pr
otru
sion
valu
es
mus
t be
re
calcu
late
d us
ing
the
form
ulas
sh
own
in
Appe
ndix
I. W
J
COPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling ServicesCOPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling Services
c3s
+=I=
M
N
This
type
of
rece
ss
cons
ists
of
two
inter
secti
ng
slots
with
pa
rallel
sides
co
nver
ging
to
a sli
ghtly
tru
ncate
d ap
ex
at
botto
m
of
rece
ss.
(see
para
. 2.2
)
A-
Edge
of
he
ad
may
be
flat
or
round
ed
5 IO
z m
0”
2?
z cn
z : 5 z!
0)
2
TABL
E 6D
D
IMEN
SIO
NS
OF
TYPE
II
CR
OSS
R
ECES
SED
U
ND
ERC
UT
OVA
L C
OU
NTE
RSU
NK
HEA
D
MAC
HIN
E SC
REW
S
Nom
inal
Si
ze
Head
He
ad
Tota
l Pr
otru
sion
Abov
e Di
amet
er
Side
He
ad
Head
He
ight
Re
cess
Pe
netra
tion
Gag
ing
Diam
eter
G
aging
or
Ba
sic
Scre
w Le
ngth
A
Heig
ht
Crow
n 0
Rece
ss
Rece
ss
Rece
ss
Drive
r G
aging
De
pth
F [N
ote
(5)]
Diam
eter
Diam
eter
L
H,
Ref.
Heig
ht
Diam
eter
De
pth
Wid
th
Size
G
[Not
e (1
)I
[Note
(2
)] M
ax.
Min.
[N
ote
(3)]
C,
Ref.
Max
. M
in.
M,
Ref.
T, R
ef.
N,
Ref.
[Not
e (4
)] M
ax.
Min.
M
ax.
Min.
[N
ote
Ml
z 0
0.06
00
1 0.0
730
2 0.0
860
3 0.0
990
4 0.1
120
5 0.1
250
6 0.1
380
8 0.1
640
IO
0.190
0
12
0.216
0
‘/d
0.250
0
5/16
0.312
5
‘/a
0.375
0
7/16
0.437
5
‘/2
0.500
0
l/B
0.112
0.0
96
0.025
0.0
21
0.046
0.0
33
0.067
0.0
29
0.020
‘43
0.137
0.1
20
0.031
0.0
25
0.056
0.0
42
0.082
0.0
39
0.022
.
.
‘h 0.1
62
0.144
0.0
36
0.029
0.0
65
0.050
0.1
00
0.050
0.0
25
‘h 0.1
87
0.167
0.0
42
0.033
0.0
75
0.059
0.1
11
0.058
0.0
26
3/16
0.212
0.1
91
0.047
0.0
37
0.084
0.0
67
0.129
0.0
70
0.029
3/16
0.237
0.2
15
0.053
0.0
41
0.094
0.0
76
0.147
0.0
80
0.032
.
.
%6
0.262
0.2
38
0.059
0.0
45
0.104
0.0
84
0.161
0.0
88
0.034
‘A
0.312
0.2
85
0.070
0.0
52
0.123
0.1
01
0.197
0.1
12
0.039
%6
0.362
0.3
33
0.081
0.0
60
0.142
0.1
18
0.236
0.1
32
0.045
.
23
0.412
0.3
80
0.092
0.0
68
0.161
0.1
35
0.260
0.1
4%
0.048
.
.
%6
0.477
0.4
42
0.107
0.0
79
0.186
0.1
58
0.304
0.1
69
0.054
‘h 0.5
97
0.556
0.1
34
0.099
0.2
32
0.198
0.3
8 1
0.218
0.0
66
g/16
0.7
17
0.670
0.1
61
0.117
0.2
78
0.239
0.4
53
0.266
0.0
77
%
0.760
0.7
15
0.156
0.1
22
0.279
0.2
39
0.498
0.2
95
0.083
.
%
0.815
0.7
65
0.156
0.1
31
0.288
0.2
44
0.548
0.3
28
0.090
Note
(6)
Note
(6)
Note
(6)
Note
(6)
0.030
0.0
20
0.038
0.0
27
0.050
0.0
38
0.062
0.0
50
0.071
0.0
59
0.095
0.0
82
0.121
0.1
07
0.137
0.1
22
0.167
0.1
50
0.218
0.1
98
0.266
0.2
44
0.296
0.2
73
0.329
0.3
05
0.047
0.0
31
0.053
0.0
35
0.058
0.0
39
0.064
0.0
44
0.069
0.0
48
0.075
0.0
53
0.080
0.0
57
0.091
0.0
66
0.102
0.0
75
0.113
0.0
84
0.129
0.0
95
0.155
0.1
17
0.182
0.1
39
0.195
0.1
50
0.212
0.1
63
0.078
0.101
0.124
0.148
0.172
0.196
0.220
0.267
0.313
0.362
0.424
0.539
0.653
0.690
0.739
GENE
RAL
NOTE
: Fo
r ad
dition
al re
quire
men
ts re
fer
to
para
. 2.
NOTE
S:
(1)
Whe
re sp
ecify
ing
nom
inal
size
in de
cimals
, ze
ros
prece
ding
decim
al an
d in
the
fourth
de
cimal
place
sh
all
be
omitte
d.
(2)
Scre
ws
of
these
len
gths
and
shor
ter
are
unde
rcut.
Scre
ws
of
longe
r len
qths
shall
ha
ve
head
he
ights
as
show
n in
Table
4D
. i3j
Ta
bulat
ed
value
s de
term
ined
from
for
mula
fo
r m
axim
um
H in
Appe
ndihA
. (4
) Po
int
sam
e on
all
dr
ivers.
(5
) No
tol
eranc
e fo
r ga
ging
diam
eter
is giv
en.
If the
ga
ging
diam
eter
of
the
gage
us
ed
differ
s fro
m
tabula
ted
value
, the
pro
trusio
n wi
ll be
aff
ected
ac
cord
ingly
and
the
prope
r pro
trusio
n va
lues
mus
t be
rec
alcula
ted
using
the
for
mula
s sh
own
in Ap
pend
ix I.
(6)
Not
prac
tical
to
gage
.
COPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling ServicesCOPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling Services
x
This
typ
e of
re
cess
ha
s a
larg
e ce
nter
op
enin
g,
tape
red
wing
s,
and
blun
t bo
ttom
, wi
th
all
edge
s re
lieve
d or
ro
unde
d.
Long
Sc
rews
W
ith
Redu
ced
Body
an
d Sh
ould
er
TABL
E 7A
IL
LUST
RAT
ION
COPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling ServicesCOPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling Services
,.,
s LA
TABL
E 7A
D
IMEN
SIO
NS
OF
TYPE
I
CR
OSS
R
ECES
SED
FL
AT
CO
UN
TER
SUN
K TR
IM
HEA
D
MAC
HIN
E SC
REW
S 5
Nom
inal
Size
or
Pr
otru
sion
:
Basi
c Sh
ould
er
Head
He
ad
Rece
ss
Abov
e G
aging
Scre
w Di
amet
er
Diam
eter
G
aging
Re
cess
Re
cess
Re
cess
Pe
netra
tion
Diam
eter
F
5
Diam
eter
He
ad
E A
Heig
ht
Diam
eter
2
H,
Ref.
Diam
eter
De
pth
Wid
th
Drive
r G
aging
De
pth
[Not
e (4
)l G
m
[Not
e (2
11
Size
M
ax.
Min.
M
ax.
Min.
[N
ote
(311
M
, Re
f. T,
Ref
. N,
Re
f. Si
ze
Max
. M
in.
Max
. M
in.
[Not
e (4
11
$
4 0.1
120
5 0.1
250
6 0.1
380
6 0.1
380
0.112
0.1
06
0.187
0.1
67
0.052
0.
100
0.060
0.0
18
0.125
0.1
19
0.212
0.1
91
0.060
0.1
22
0.081
0.0
18
0.138
0.1
31
0.212
0.1
91
0.052
0.1
22
0.081
0.0
18
0.138
0.1
31
0.237
0.2
15
0.068
0.1
48
0.074
0.0
27
0.061
0.0
45
0.031
0.0
18
0.148
0.082
0.0
66
0.032
0.0
19
0.172
0.082
0.0
66
0.032
0.0
19
0.172
0.075
0.0
52
0.034
0.0
20
0.196
8 0.1
640
5 0.1
64
0.157
0.2
37
0.215
0.0
52
0.158
0.0
84
0.02
9
8 0.1
640
6 0.1
64
0.157
0.2
62
0.238
0.0
69
0.176
0.1
02
0.030
10
0.190
0 8
0.190
0.1
81
0.312
0.2
85
0.085
0.1
82
0.110
0.0
30
z;’
12
0.216
0 8
0.216
0.2
07
0.312
0.2
85
0.069
0.1
92
0.120
0.0
32
12
0.216
0 10
0.2
16
0.207
0.3
62
0.333
0.1
01
0.198
0.1
24
0.032
l/4
0.250
0 10
0.2
50
0.240
0.3
62
0.333
0.0
80
0.19
8 0.1
24
0.032
& 0.2
500
12
0.250
0.2
40
0.412
0.3
80
0.112
0.2
62
0.144
0.0
35
%6
0.312
5 12
0.3
12
0.302
0.4
12
0.380
0.0
75
0.262
0.1
44
0.035
5/6
0.312
5 ‘4
0.312
0.3
02
0.477
0.4
42
0.116
0.2
76
0.160
0.0
36
‘/,
0.375
0 %
6 0.3
75
0.364
0.5
97
0.556
0.1
55
0.358
0.2
05
0.061
0.085
0.0
62
0.034
0.0
20
0.19
6 0.1
03
0.080
0.0
36
0.021
0.2
20
0.110
0.0
87
0.039
0.0
23
0.267
0.120
0.0
97
0.039
0.0
23
0.267
0.125
0.1
02
0.042
0.0
25
0.313
0.125
0.1
02
0.042
0.0
25
0.313
0.139
0.1
16
0.045
0.0
27
0.362
0.139
0.1
16
0.045
0.0
27
0.362
0.154
0.1
31
0.050
0.0
29
0.424
0.196
0.1
74
0.057
0.0
34
0.539
GENE
RAL
NOTE
S:
(a)
For
addit
ional
requ
irem
ents
refer
to
pa
ra.
2.
(b)
For
refer
ence
, se
e Ta
ble
7A
Illustr
ation
on
pre
vious
pa
ge.
NOTE
S:
(1)
Shor
t sc
rews
inc
lude
nom
inal
length
s up
to
an
d inc
luding
l’/a
in.
fo
r siz
es
No.
5 an
d sm
aller
, an
d 2
in.
for
sizes
No
. 6
and
large
r, (2
) W
here
spec
ifying
no
mina
l siz
e in
decim
als.
zeros
pre
cedin
g de
cimal
and
in the
fou
rth
decim
al pla
ce
shall
be
om
itted.
(3
) Ta
bulat
ed
value
s de
term
ined
from
for
mula
fo
r m
axim
um
H in
Appe
ndix
A.
(4)
No
tolera
nce
for
gagin
g dia
mete
r is
given
. If
the
gagin
g dia
mete
r of
the
ga
ge
used
dif
fers
from
tab
ulated
va
lue,
the
protru
sion
will
be
affec
ted
acco
rding
ly an
d the
pro
per
protru
sion
value
s m
ust
be
recalc
ulated
us
ing
the
form
ulas
show
n in
Appe
ndix
I.
R 2 a co
in w
I,
COPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling ServicesCOPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling Services
This
typ
e of
re
cess
ha
s a
larg
e ce
nter
op
enin
g,
wide
st
raig
ht
wing
s,
and
blun
t bo
ttom
, wi
th
all
edge
s re
lieve
d or
ro
unde
d.
A m
in.
I- Ed
ge
of
head
m
ay
be
flat
or
roun
ded
)/d,,b
[N
ote(
l)1
1
+---I
a I
LPro
trusio
n ga
ge
-4--
0.06
2 m
in.
TAB
LE
78
ILLU
ST
RA
TIO
N
Long
Sc
rews
W
ith
Redu
ced
Body
an
d Sh
ould
er
COPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling ServicesCOPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling Services
TABL
E 7B
D
IMEN
SIO
NS
OF
TYPE
IA
CR
OSS
R
ECES
SED
FL
AT
CO
UN
TER
SUN
K TR
IM
HEA
D
MAC
HIN
E SC
REW
S
Nom
inal
Size
or
Protr
usion
Basic
Sh
oulde
r He
ad
Head
Re
cess
Ab
ove
Gagin
g
Scre
w Di
amete
r Di
amete
r
E A
Heigh
t Re
cess
Re
cess
Re
cess
Pe
netra
tion
Diam
eter
f
Diam
eter
Head
H,
Re
f. Di
amete
r De
pth
Widt
h Dr
iver
Gagin
g De
pth
[Note
(4
11
[Note
(21
1 Siz
e M
ax.
Min.
M
ax.
Min.
[N
ote
(311
M
. Re
f. T,
kef
. N,
Re
f. Siz
e M
ax.
Min.
M
ax.
Min.
4 0.
1120
3
0.11
2 0.
106
0.18
7 0.
167
0.05
2 0.
100
0.06
0 0.
029
1 0.
058
0.04
2 0.
031
0.01
8 5
0.12
50
4 0.
125
0.11
9 0.
212
0.19
1 0.
060
0.12
2 0.
081
0.03
0 I
0.07
9 0.
063
0.03
2 0.
019
6 0.
1380
4
0.13
8 0.
131
0.21
2 0.
191
0.05
2 0.
122
0.08
1 0.
030
1 0.
079
0.06
3 0.
032
0.01
9 6
0.13
80
5 0.
138
0.13
1 0.
237
0.21
5 0.
068
0.14
8 0.
077
0.04
1 2
0.07
1 0.
053
0.03
4 0.
020
Gagin
g
Diam
eter G
[Not
e (4
11
0.14
8 0.
172
0.17
2
0.19
6
8 0.
1640
5
0.16
4 0.
157
0.23
7 0.
215
0.05
2 0.
158
0.08
8 0.
041
2 0.
081
0.06
3 0.
034
0.02
0 0.
196
8 0.
1640
6
0.16
4 0.
157
0.26
2 0.
238
0.06
9 0.
176
0.10
5 0.
041
2 0.
099
0.08
1 0.
036
0.02
1 0.
220
IO
0.19
00
a 0.
190
0.18
1 0.
312
0.28
5 0.
085
0.18
2 0.
112
0.04
1 2
0.10
7 0.
089
0.03
9 0.
023
0.26
7 %
12
0.
2160
a
0.21
6 0.
207
0.31
2 0.
285
0.06
9 0.
192
0.12
2 0.
041
2 0.
117
0.09
9 0.
039
0.02
3 0.
267
12
0.21
60
10
0.21
6 0.
207
0.36
2 0.
333
0.10
1 0.
198
0.12
7 0.
041
2 0.
122
0.10
4 0.
042
0.02
5 0.
313
‘/4
0.25
00
10
0.25
0 0.
240
0.36
2 0.
333
0.08
0 0.
198
0.12
7 0.
041
2 0.
122
0.10
4 0.
042
0.02
5 0.
313
‘/4
0.25
00
I2
0.25
0 0.
240
0.41
2 0.
380
0.11
2 0.
262
0.14
9 0.
056
3 0.
136
0.11
8 0.
045
0.02
7 0.
362
5/,6
0.
3125
12
0.
312
0.30
2 0.
412
0.38
0 0.
075
0.26
2 0.
149
0.05
6 3
0.13
6 0.
118
0.04
5 0.
027
0.36
2 5/
,6
0.31
25
‘4
0.31
2 0.
302
0.47
7 0.
442
0.11
6 0.
276
0.16
4 0.
057
3 0.
151
0.13
3 0.
050
0.02
9 0.
424
?k
0.37
50
5/16
0.
375
0.36
4 0.
597
0.55
6 0.
155
0.35
8 0.
211
0.08
6 4
0.19
3 0.
175
0.05
7 0.
034
0.53
9
GEN
ERAL
NO
TES:
(a
) Fo
r ad
ditio
nal
requ
irem
ents
refe
r to
pa
ra.
2.
(b)
For
refe
renc
e,
see
Tabl
e 78
Illu
stra
tion
on
prev
ious
page
.
NOTE
S:
(1)
Shor
t sc
rews
in
clude
no
min
al
leng
ths
up
to
and
inclu
ding
I’/
s in
. fo
r siz
es
No.
5 an
d sm
alle
r, an
d 2
in.
for
sizes
No
. 6
and
large
r. (2
) W
here
sp
ecify
ing
nom
inal
siz
e in
de
cimal
s,
zero
s pr
eced
ing
decim
al
and
in
the
four
th
decim
al
plac
e sh
all
be
omitt
ed.
(3)
Tabu
late
d va
lues
de
term
ined
from
fo
rmula
fo
r m
axim
um
H in
Ap
pend
ix A.
(4
) No
to
lera
nce
for
gagi
ng
diam
eter
is
give
n.
If th
e ga
ging
dia
met
er
of
the
gage
us
ed
diffe
rs
from
ta
bula
ted
value
, th
e pr
otru
sion
will
be
affe
cted
ac
cord
ingl
y an
d th
e pr
oper
pr
otru
sion
valu
es
mus
t be
re
calcu
late
d us
ing
the
form
ulas
sh
own
in
Appe
ndix
I.
COPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling ServicesCOPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling Services
This
typ
e of
re
cess
co
nsis
ts
of
two
inte
rsec
ting
slot
s wi
th
para
llel
side
s co
nver
ging
to
a sli
ghtly
tru
ncat
ed
apex
at
bo
ttom
of
re
cess
.
Prot
rusio
n ga
ge
Long
Sc
rews
W
ith
Redu
ced
Body
an
d Sh
ould
er
TABL
E 7C
IL
LUST
RATI
ON
COPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling ServicesCOPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling Services
TABL
E 7C
D
IMEN
SIO
NS
OF
TYPE
II
CR
OSS
R
ECES
SED
FL
AT
CO
UN
TER
SUN
K TR
IM
HEA
D
MAC
HIN
E SC
REW
S
Nom
inal
Pr
otru
sion
Size
or
Ba
sic
Shou
lder
He
ad
Head
Re
cess
Ab
ove
Gag
ing
Pene
tratio
n Di
amet
er
F G
aging
Scre
w Di
amet
er
Diam
eter
He
ight
Re
cess
Re
cess
Re
cess
Dr
iver
Diam
eter
Diam
eter
He
ad
E A
H,
Ref.
Diam
eter
De
pth
Wid
th
Size
G
aging
De
pth
INot
e (5
J1
G
[Not
e (2
11
Size
M
ax.
Min.
M
ax.
Min.
[N
ote
(311
M,
Ref.
T, R
ef.
N.
Ref.
[Not
e (41
1 M
ax.
Min.
M
ax.
Min.
[N
ote
(5Jl
4 0.1
120
3 0.1
12
0.106
0.1
87
0.167
0.0
52
0.133
0.0
72
0.030
0.0
53
0.041
0.0
31
0.018
0.1
48
5 0.1
250
4 0.1
25
0.119
0.2
12
0.191
0.0
60
0.151
0.0
82
0.032
.
0.064
0.0
52
0.032
0.0
19
0.172
6
0.138
0 4
0.138
0.1
31
0.212
0.1
91
0.052
0.1
51
0.082
0.0
32
0.064
0.0
52
0.032
0.0
19
0.172
6
0.138
0 5
0.138
0.1
31
0.237
0.2
15
0.068
0.1
69
0.094
0.0
35
0.077
0.0
64
0.034
0.0
20
0.196
8 0.1
640
5 0.1
64
0.157
0.2
37
0.215
0.0
52
0.169
0.0
94
0.035
.
. .
0.077
0.0
64
0.034
0.0
20
0.196
8
0.164
0 6
0.164
0.1
57
0.262
0.2
38
0.069
0.1
88
0.106
0.0
38
. 0.0
89
0.075
0.0
36
0.021
0.2
20
10
0.190
0 8
0.190
0.1
81
0.312
0.2
85
0.085
0.2
24
0.124
0.0
43
. .
. 0.1
13
0.099
0.0
39
0.023
0.2
67
P 12
0.2
160
8 0.2
16
0.207
0.3
12
0.285
0.0
69
0.224
0.1
24
0.043
.
. 0.1
13
0.099
0.0
39
0.023
0.2
67
12
0.216
0 IO
0.2
16
0.207
0.3
62
0.333
0.1
01
0.260
0.1
48
0.048
.
. .
0.137
0.1
22
0.042
0.0
25
0.313
‘/4
0.250
0 10
0.2
50
0.240
0.3
62
0.333
0.0
80
0.260
0.1
48
0.048
,
, 0.1
37
0.122
0.0
42
0.025
0.3
13
‘/4
0.250
0 12
0.2
50
0.240
0.4
12
0.380
0.1
12
0.297
0.1
72
0.054
0.1
62
0.145
0.0
45
0.027
0.3
62
5/S
0.312
5 12
0.3
12
0.302
0.4
12
0.380
0.0
75
0.297
0.1
72
0.054
.
. .
0.162
0.1
45
0.045
0.0
27
0.362
5/
,6
0.312
5 ‘/,
0.3
12
0.302
0.4
77
0.442
0.1
16
0.344
0.1
95
0.061
.
. .
0.193
0.1
76
0.050
0.0
29
0.424
“/8
0.3
750
5/16
0.375
0.3
64
0.597
0.5
56
0.155
0.4
32
0.252
0.0
74
0.251
0.2
32
0.057
0.0
34
0.539
GENE
RAL
NOTE
S:
(a)
For
addit
ional
requ
irem
ents
refer
to
pa
ra.
2.
(b)
For
refer
ence
, se
e Ta
ble
7C
Illustr
ation
on
pre
vious
pa
ge.
NOTE
S:
(1)
Shor
t sc
rews
inc
lude
nom
inal
length
s up
to
an
d inc
luding
lr/a
in.
fo
r siz
es
No.
5 an
d sm
aller
, an
d 2
in.
for
sizes
No
. 6
and
large
r. (2
) W
here
spec
ifying
no
mina
l siz
e in
decim
als,
zeros
pre
cedin
g de
cimal
and
in the
fou
rth
decim
al pla
ce
shall
be
om
itted.
(3
) Ta
bulat
ed
value
s de
term
ined
from
for
mula
fo
r m
axim
um
H in
Appe
ndix
A.
(4)
Point
sa
me
on
all
drive
rs.
(5)
No
tolera
nce
for
gagin
g dia
mete
r is
given
. If
the
gagin
g dia
mete
r of
the
ga
ge
used
dif
fers
from
tab
ulated
va
lue,
the
protru
sion
will
be
affec
ted
acco
rding
ly an
d the
pro
per
protru
sion
value
s m
ust
be
recalc
ulated
us
ing
the
form
ulas
show
n in
Appe
ndix
I.
COPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling ServicesCOPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling Services
Thist
ype
of
rece
ss
has
a la
rge
cent
er
open
ing,ta
pere
d wi
ngs,
an
d bl
untb
otto
m,w
ith
all
edge
s re
lieve
d or
ro
unde
d.
a 8
Shor
t Sc
rews
It- 0.
062
min
. Long
Sc
rews
W
ith
Redu
ced
Body
an
d Sh
ould
er
TABL
E 8A
D
IMEN
SIO
NS
OF
TYPE
I
CR
OSS
R
ECES
SED
O
VAL
CO
UN
TER
SUN
K TR
IM
HEA
D
MAC
HIN
E SC
REW
S -
Nom
inal
Si
ze
Shou
lder
He
ad
Head
To
tal
Rece
ss
Prot
rusio
n z
or
Basi
c Si
de
Head
He
ad
Pene
tratio
n Ab
ove
Gag
ing
( 2
Scre
w Di
amet
er
Diam
eter
G
aging
Di
amet
er
f Za
ging
Di
5
Diam
eter
He
ad
E A
Heig
ht
Crow
n He
ight
He
ad
Rece
ss
Rece
ss
Rece
ss
iamet
er
m
H,
Ref.
Heig
ht
0,
Ref.
Radi
us
Diam
eter
De
pth
Wid
th
Drive
r De
pth
[Not
e ‘-”
!
i311
G
v, [N
ote
WI
Size
M
ax.
Min.
M
ax.
Min.
[N
ote
(311
C,
Re
f. [N
ote
(411
R,
Re
f. M
, Re
f. T,
Ref
. N,
Re
f. Si
ze
Max
. M
in.
Max
. M
in.
[Not
e (5
)] q
For
Shor
t Sc
rews
[N
ote
(111
4 0.
1120
3
0.18
7 0.
167
0.05
7 5
0.12
50
4 .
. 0.
212
0.19
1 0.
066
6 0.
1380
4
. .
. .
. 0.
212
0.19
1 0.
058
6 0.
1380
5
. .
. 0.
237
0.21
5 0.
075
8 0.
1640
5
. . .
.
0.23
7 0.
215
0.06
0 8
0.16
40
6 .
. .
. .
. 0.
262
0.23
8 0.
076
10
0.19
00
8 .
0.31
2 0.
285
0.09
4 12
0.
2160
a
. .
. 0.
312
0.28
5 0.
078
12
0.21
60
10
. .
. .
. .
0.36
2 0.
333
0.11
1
0.03
3 0.
037
0.03
7
0.04
1
0.04
1 0.
045
0.07
6 0.
076
0.06
0
0.08
6 0.
014
0.11
8 0.
072
0.01
9 1
0.07
4 0.
057
0.06
4 0.
044
0.14
8 5
0.09
9 0.
017
0.13
0 0.
086
0.01
9 1
0.08
7 0.
070
0.06
9 0.
048
0.17
2 c'
0.09
1 0.
017
0.13
0 0.
086
0.01
9 1
0.08
7 0.
070
0.06
9 0.
048
0.17
2 5
0.11
2 0.
019
0.15
2 0.
073
0.02
8 2
0.07
4 0.
050
0.07
5 0.
053
0.19
6 2
0.09
6 0.
019
0.15
2 0.
073
0.02
8 2
0.07
4 0.
050
0.07
5 0.
053
0.19
6 z
0.11
7 0.
021
0.17
2 0.
092
0.03
0 2
0.09
4 0.
069
0.08
0 0.
057
0.22
0 g
0.14
1 0.
025
0.18
6 0.
107
0.03
1 2
0.10
8 0.
084
0.09
1 0.
066
0.26
7 R
0.12
5 0.
025
0.18
6 0.
107
0.03
1 2
0.10
8 0.
084
0.09
1 0.
066
0.26
7 z
0.16
6 0.
029
0.20
2 0.
125
0.03
3 2
0.12
6 0.
102
0.10
2 0.
075
0.31
3 E
(con
tinue
d)
ii
COPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling ServicesCOPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling Services
3 F 6 5 TA
BLE
8A
DIM
ENSI
ON
S O
F TY
PE
I C
RO
SS
REC
ESSE
D
OVA
L C
OU
NTE
RSU
NK
TRIM
H
EAD
M
ACH
INE
SCR
EWS
(CO
NT’
D)
vl
Head
To
tal
Rece
ss
Protr
usion
usion
Fz
Fz
No
mina
l Siz
e Sh
oulde
r He
ad
Pene
tratio
n Ab
ove
Gagin
g Ga
ging
P.--:
-- 2 2
or
Basic
Sid
e He
ad
Head
Ga
ging
O-J
c/-J
Scre
w Di
amete
r Di
amete
r He
ight
Crow
n He
ight
Head
Re
cess
Re
cess
Re
cess
Ga
ging
Diam
eter
F Di
amete
r -.
I...
-_-.
P P Di
amete
r He
ad
E A
H,
Ref.
Heigh
t 0,
Re
f. Ra
dius
Diam
eter
Depth
W
idth
Drive
r De
pth
[Note
(5
11
? (5
11
G
G
Q
Q
(Note
(2
11
Size
Max
. M
in.
Max
. M
in.
[Note
(3
)] C,
Re
f. [N
ote
(411
R,
Ref.
M,
Ref.
T.
Ref.
N,
Ref.
Size
Max
. M
in.
Max
. M
in.
[Note
(51
1 5 r-7
Fo
r Sh
ort
Scre
ws
[Note
(11
1 (C
ont’d
) . ,
I z
0.313
m
0.362
:
0.362
:
0.424
g
0.539
E 2
'/4
0.250
0 10
0.3
62
0.333
'/4
0.250
0 12
.
. .
0.412
0.3
80
5/,6
0.3
125
12
0.412
0.3
80
5/,5
0.3
125
'/4
. .
. .
. 0.4
77
0.442
"/8
0.3
750
%$j
. .
0.597
0.5
56
For
Long
Sc
rews
W
ith
Shou
lder
4 0.1
120
3 0.1
12
0.106
0.1
87
0.167
5
0.125
0 4
0.125
0.1
19
0.212
0.1
91
6 0.1
380
4 0.1
38
0.131
0.2
12
0.191
6
0.138
0 5
0.138
0.1
31
0.237
0.2
15
8 0.1
640
5 0.1
64
0.157
0.2
37
0.215
8 0.1
640
6 0.1
64
0.157
0.2
62
0.238
IO
0.190
0 8
0.190
0.1
81
0.312
0.2
85
12
0.216
0 8
0.216
0.2
07
0.312
0.2
85
12
0.216
0 10
0.2
16
0.207
0.3
62
0.333
'/4
0.250
0 10
0.2
50
0.240
0.3
62
0.333
0.0
91
0.060
0.1
46
0.029
0.2
14
0.136
0.0
33
'/4
0.250
0 12
0.2
50
0.240
0.4
12
0.380
0.1
24
0.068
0.1
87
0.033
0.2
64
0.140
0.0
38
%6
0.312
5 12
0.3
12
0.302
0.4
12
0.380
0.0
87
0.068
0.1
50
0.033
0.2
64
0.140
0.0
38
5/16
0.312
5 'Ai
0.3
12
0.302
0.4
77
0.442
0.1
30
0.079
0.2
02
0.038
0.2
84
0.160
0.0
40
"/a
0.375
0 5&
j 0.3
75
0.364
0.5
97
0.556
0.1
73
0.099
0.2
65
0.048
0.3
84
0.226
0.0
65
0.091
0.0
60
0.146
0.0
29
0.202
0.1
25
0.033
0.124
0.0
68
0.187
0.0
33
0.264
0.1
40
0.038
0.087
0.0
68
0.150
0.0
33
0.264
0.1
40
0.038
0.130
0.0
79
0.202
0.0
38
0.284
0.1
60
0.040
0.173
0.0
99
0.265
0.0
48
0.384
0.2
26
0.065
0.057
0.0
33
0.086
0.0
14
0.118
0.0
72
0.019
0.066
0.0
37
0.099
0.0
17
0.130
0.0
86
0.019
0.058
0.0
37
0.091
0.0
17
0.130
0.0
86
0.019
0.075
0.0
41
0.112
0.0
19
0.162
0.0
84
0.028
0.060
0.0
41
0.096
0.0
19
0.162
0.0
84
0.028
0.076
0.0
45
0.117
0.0
21
0.188
0.1
08
0.031
0.094
0.0
76
0.141
0.0
25
0.200
0.1
22
0.031
0.078
0.0
76
0.125
0.0
25
0.200
0.1
22
0.031
0.111
0.0
60
0.166
0.0
29
0.214
0.1
36
0.033
2 3 3 3 4 1 1 1 2 2 2 2 2 2 2 3 3 3 4
0.126
0.1
02
0.102
0.0
75
0.135
0.1
11
0.113
0.0
84
0.135
0.1
11
0.113
0.0
84
0.156
0.1
31
0.129
0.0
95
0.218
0.1
94
0.155
0.1
17
0.074
0.0
57
0.064
0.0
44
0.148
0.087
0.0
70
0.069
0.0
48
0.172
0.087
0.0
70
0.069
0.0
48
0.172
0.085
0.0
61
0.075
0.0
53
0.196
0.085
0.0
61
0.075
0.0
53
0.196
0.110
0.0
85
0.080
0.0
57
0.220
0.1
24
0.099
0.0
91
0.066
0.2
67
0.124
0.0
99
0.091
0.0
66
0.267
0.137
0.1
12
0.102
0.0
75
0.313
0.137
0.1
12
0.102
0.0
75
0.135
0.1
11
0.113
0.0
84
0.135
0.1
11
0.113
0.0
84
0.156
0.1
31
0.129
0.0
95
0.313
0.362
0.362
0.424
0.539
0.2
18
0.194
0.1
55
0.117
GENE
RAL
NOTE
: Fo
r ad
dition
al re
quire
men
ts re
fer
to
para
. 2.
NOTE
S:
(1)
Shor
t sc
rews
inc
lude
nom
inal
length
s up
to
an
d inc
luding
I'&
in.
fo
r siz
es
No.
5 an
d sm
aller
, an
d 2
in.
for
sizes
No
, 6
and
large
r. (2
) W
here
spec
ifying
no
mina
l siz
e in
decim
als,ze
ros
prece
ding
decim
al an
d in
the
fourth
de
cimal
place
sh
all
be
omitte
d.
(3)
Tabu
lated
va
lues
deter
mine
d fro
m
form
ula
for
max
imum
Hin
Ap
pend
ix A.
E;
(4)
Tabu
lated
va
lues
deter
mine
d fro
m
form
ula
for
max
imum
Oi
n Ap
pend
ix A.
3
(5)
No
tolera
nce
for
gagin
g dia
mete
r is
given
. If
the
gagin
g dia
mete
r of
the
ga
ge
used
dif
fers
from
tab
ulated
va
lue,
the
protru
sion
will
be
affec
ted
acco
rding
ly an
d the
E
prope
r pro
trusio
n va
lues
mus
t be
rec
alcula
ted
using
the
for
mula
s sh
own
in Ap
pend
ix I.
a,
F w
I,
COPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling ServicesCOPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling Services
dor
round
ed.
(see
para
.2.2)
0.062
m
in. Lo
ng
Scre
ws
With
Re
duce
d Bo
dy
and
Shou
lder
TABL
E 8B
D
IMEN
SIO
NS
OF
TYPE
IA
CR
OSS
R
ECES
SED
O
VAL
CO
UN
TER
SUN
K TR
IM
HEA
D
MAC
HIN
E SC
REW
S
Nom
inal
Si
ze
Head
To
tal
Rece
ss
Prot
rusio
n I
or
Basi
c Sh
ould
er
Head
Di
amet
er
Side
He
ad
Head
Pe
netra
tion
Abov
e G
aging
Scre
w Di
amet
er
Heig
ht
Crow
n He
ight
He
ad
Rece
ss
Rece
ss
Rece
ss
Gag
ing
Diam
eter
F
Gag
ing
z Di
amet
er
Diam
eter
He
ad
E A
H,
Ref.
Heig
ht
0,
Ref.
Radi
us
Diam
eter
De
pth
Wid
th
Drive
r De
pth
[Not
e (5
11
G
K [N
ote
WI
Size
M
ax.
Min.
M
ax.
Min.
[N
ote
(3)]
C,
Ref.
[Not
e (4
)] R,
Re
f. M
, Re
f. T,
Ref
. N,
Re
f. Siz
e M
ax.
Min.
M
ax.
Min.
[N
ote
(511
$
For
Shor
t Sc
rews
[N
ote
(I)]
v)
4 0.1
120
3 .
. .
0.187
0.1
67
0.057
0.0
33
0.086
0.0
14
0.118
0.0
77
0.030
1
0.074
0.0
58
0.064
0.0
44
0.148
z
5 0.1
250
4 .
. 0.2
12
0.191
0.0
66
0.037
0.0
99
0.017
0.1
30
0.089
0.0
30
1 0.0
86
0.070
0.0
69
0.048
0.1
72
6 0.1
380
4 6
. 0.2
12
0.191
0.0
58
0.037
0.0
91
0.017
0.1
30
0.089
0.0
30
1 0.0
86
0.070
0.0
69
0.048
0.1
72
o
6 0.1
380
5 .
0.237
0.2
15
0.075
0.0
41
0.112
0.0
19
0.152
0.0
80
0.041
2
0.074
0.0
56
0.075
0.0
53
0.196
$ rn
8
0.164
0 5
. .
. .
0.237
0.2
15
0.060
0.0
41
0.096
0.0
19
0.152
0.0
80
0.041
2
0.074
0.0
56
0.075
0.0
53
0.196
8 0.1
640
g
6 .,.
0.2
62
0.238
0.0
76
0.045
0.1
17
0.021
0.1
72
0.100
0.0
41
2 0.0
93
0.075
0.0
80
0.057
0.2
20
10
0.190
0 8
. 0.3
12
0.285
0.0
94
0.076
0.1
41
0.025
0.1
86
0.115
0.0
41
2 0.1
08
0.090
0.0
91
0.066
0.2
67
g s
12
0.216
0 8
. .
. 0.3
12
0.285
0.0
78
0.076
0.1
25
0.025
0.1
86
0.115
0.0
41
2 0.1
08
0.090
0.0
91
0.066
0.2
67
12
0.216
0 10
.
. .
0.362
0.3
33
0.111
0.0
60
0.166
0.0
29
0.202
0.1
32
0.041
2
0.125
0.1
07
0.102
0.0
75
0.313
E iT
i
(con
tim
ed)
COPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling ServicesCOPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling Services
E
I z TA
BLE
88
DIM
ENSI
ON
S O
F TY
PE
IA C
RO
SS
REC
ESSE
D
OVA
L C
OU
NTE
RSU
NK
TRIM
H
EAD
M
ACH
INE
SCR
EWS
(CO
NT’
D)
m
v,
Nom
inal
Size
Head
To
tal
Rece
ss
Protr
usion
;;;
or
Basic
Sh
oulde
r He
ad
Diam
eter
Diam
eter
Side
Head
He
ad
Pene
tratio
n Ab
ove
Gagin
g Ga
ging
5
Scre
w Ga
ging
Diam
eter
F
Diam
eter
Head
E
A He
ight
Crow
n He
ight
Head
Re
cess
Re
cess
Re
cess
Di
amete
r H,
Re
f. He
ight
0.
Ref.
Radiu
s Di
amete
r De
pth
Widt
h Dr
iver
Depth
[N
ote
(5)l
is
G 0
[Not
e (2
11
Size
Max
. M
in.
Max
. M
in.
[Note
(3
)] C,
Re
f. [N
ote
(411
R,
Ref.
M,
Ref.
K Re
f. N,
Re
f. Siz
e M
ax.
Min.
M
ax.
Min.
[N
ote
WI
T
For
Shor
t Sc
rews
[N
ote
(l)]
(Con
t’d)
1/e
0.25
00
10
. 0.
362
0.33
3 0.
091
'/4
0.25
00
12
. 0.
412
0.38
0 0.
124
5/6
0.31
25
12
. .
. .
. 0.
412
0.38
0 0.
087
5/,6
0.
3125
'/4
0.
477
0.44
2 0.
130
"/,
0.37
50
7,s
.,.
. .
. 0.
597
0.55
6 0.
173
For
Long
Sc
rews
W
ith
Shou
lder
4 0.
1120
5
0.12
50
6 0.
1380
6
0.13
80
0.11
2 0.
106
0.18
7 0.
167
0.12
5 0.
119
0.21
2 0.
191
0.13
8 0.
131
0.21
2 0.
191
0.13
8 0.
131
0.23
7 0.
215
0.05
7 0.
066
0.05
8 0.
075
0.03
3 0.
086
0.01
4 0.
118
0.07
7 0.
030
0.03
7 0.
099
0.01
7 0.
130
0.08
9 0.
030
0.03
7 0.
091
0.01
7 0.
130
0.08
9 0.
030
0.04
1 0.
112
0.01
9 0.
162
0.09
1 0.
041
8 0.
1640
5
0.16
4 0.
157
0.23
7 0.
215
0.06
0 0.
041
0.09
6 0.
019
0.16
2 0.
091
0.04
1 8
0.16
40
6 0.
164
0.15
7 0.
262
0.23
8 0.
076
0.04
5 0.
117
0.02
1 0.
188
0.11
7 0.
041
10
0.19
00
8 0.
190
0.18
1 0.
312
0.28
5 0.
094
0.07
6 0.
141
0.02
5 0.
200
0.13
0 0.
041
12
0.21
60
8 0.
216
0.20
7 0.
312
0.28
5 0.
078
0.07
6 0.
125
0.02
5 0.
200
0.13
0 0.
041
12
0.21
60
10
0.21
6 0.
207
0.36
2 0.
333
0.11
1 0.
060
0.16
6 0.
029
0.21
4 0.
143
0.04
1
'/4
0.25
00
10
0.25
0 0.
240
0.36
2 0.
333
0.09
1 0.
060
0.14
6 0.
029
0.21
4 0.
143
0.04
1 '/4
0.
2500
12
0.
250
0.24
0 0.
412
0.38
0 0.
124
0.06
8 0.
187
0.03
3 0.
264
0.14
8 0.
056
%6
0.31
25
12
0.31
2 0.
302
0.41
2 0.
380
0.08
7 0.
068
0.15
0 0.
033
0.26
4 0.
148
0.05
6
5/6
0.31
25
'A
0.31
2 0.
302
0.47
7 0.
442
0.13
0 0.
079
0.20
2 0.
038
0.28
4 0.
168
0.05
7
"/*
0.37
50
5/s
0.37
5 0.
364
0.59
7 0.
556
0.17
3 0.
099
0.26
5 0.
048
0.38
4 0.
232
0.08
6
0.06
0 0.
146
0.029
0.
202
0.13
2 0.
041
0.06
8 0.
187
0.03
3 0.
264
0.14
8 0.
056
0.06
8 0.
150
0.03
3 0.
264
0.14
8 0.
056
0.07
9 0.
202
0.03
8 0.
284
0.16
8 0.
057
0.09
9 0.
265
0.04
8 0.
384
0.23
2 0.
086
-
0.12
5 0.
107
0.10
2 0.
075
0.13
5 0.
117
0.11
3 0.
084
0.13
5 0.
117
0.11
3 0.
084
0.15
5 0.
137
0.12
9 0.
095
0.21
5 0.
197
0.15
5 0.
117
0.07
4 0.
058
0.06
4 0.
044
0.14
8 0.
086
0.07
0 0.
069
0.04
8 0.
172
0.08
6 0.
070
0.06
9 0.
048
0.17
2 0.
084
0.06
6 0.
075
0.05
3 0.
196
0.08
4 0.
066
0.07
5 0.
053
0.19
6 0.
109
0.09
1 0.
080
0.05
7 0.
220
0.12
2 0.
104
0.09
1 0.
066
0.26
7 0.
122
0.10
4 0.
091
0.06
6 0.
267
0.13
6 0.
118
0.10
2 0.
075
0.31
3
0.13
6 0.
118
0.10
2 0.
075
0.31
3 0.
135
0.11
7 0.
113
0.08
4 0.
362
0.13
5 0.
117
0.11
3 0.
084
0.36
2 0.
155
0.13
7 0.
129
0.09
5 0.
424
0.21
5 0.
197
0.15
5 0.
117
0.53
9
h I z 0.
313
m
0.36
2 0"
0.
362
g 0.
424
z 0.
539
g 2
GEN
ERAL
NO
TE:
For
addi
tiona
l re
quire
men
ts re
fer
to
para
. 2.
NOTE
S:
(1)
Shor
t sc
rews
in
clude
no
min
al
leng
ths
up
to
and
inclu
ding
l'/a
in
. fo
r siz
es
No.
5 an
d sm
alle
r, an
d 2
in.
for
sizes
No
. 6
and
large
r. (2
) W
here
sp
ecify
ing
nom
inal
siz
e in
de
cimal
s,ze
ros
prec
edin
g de
cimal
an
d in
th
e fo
urth
de
cimal
pl
ace
shal
l be
om
itted
. (3
) Ta
bula
ted
valu
es
dete
rmine
d fro
m
form
ula
for
max
imum
H
in
Appe
ndix
A.
R (4
) Ta
bula
ted
valu
es
dete
rmine
d fro
m
form
ula
for
max
imum
O
in Ap
pend
ix A.
(5
) No
to
lera
nce
for
gagi
ng
diam
eter
is
give
n.
If th
e ga
ging
dia
met
er
of
the
gage
us
ed
diffe
rs
from
ta
bula
ted
value
, th
e pr
otru
sion
will
be
affe
cted
ac
cord
ingl
y an
d th
e 2
prop
er
prot
rusio
n va
lues
m
ust
be
reca
lcula
ted
usin
g th
e fo
rmul
as
show
n in
Ap
pend
ix I.
m
6i
b,
b
COPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling ServicesCOPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling Services
This
typ
e of
re
cess
co
nsis
ts
of
two
inte
rsec
ting
slot
s wi
th
para
llel
side
s co
nver
ging
to
a sli
ghtly
tru
ncat
ed
apex
at
bo
ttom
of
re
cess
.
. “jk=
z =a
(s
ee
paya
. 2.
2)
lt-
0.06
2 m
in. Lo
ng
Scre
ws
With
Re
duce
d Bo
dy
and
Shou
lder
TABL
E 8C
IL
LUST
RAT
ION
COPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling ServicesCOPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling Services
TABL
E 8C
D
IMEN
SIO
NS
OF
TYPE
II
CR
OSS
R
ECES
SED
O
VAL
CO
UN
TER
SUN
K TR
IM
HEA
D
MAC
HIN
E SC
REW
S
Nom
inal
Protr
usion
Size
or
Head
To
tal
Rece
ss
Abov
e
Basic
Sh
oulde
r He
ad
Side
Head
He
ad
Pene
tratio
n Ga
ging
Scre
w Di
amete
r Di
amete
r He
ight
Crow
n E
A He
ight
Head
Re
cess
Re
cess
Re
cess
Dr
iver
Gagin
g Di
amete
r F
D~~~
~t~r
Diam
eter
Head
H,
Re
f. He
ight
0,
Ref.
Radiu
s Di
amete
r De
pth
Widt
h Siz
e De
pth
[Note
16
11
G
[Note
(2
)1
Size
Max
. M
in.
Max
. M
in.
[Note
(3
)] C,
Re
f. [N
ote
14)l
R,
Ref.
M,
Ref.
T,
Ref.
A/,
Ref.
[Note
(51
1 M
ax.
Min.
M
ax.
Min.
[N
ote
(6)l
4 0.1
120
3 0.1
12
0.106
0.1
87
0.167
0.0
57
0.033
0.0
86
0.014
0.1
33
0.072
0.0
30
. 0.0
53
0.041
0.0
64
0.044
0.1
48
5 0.1
250
4 0.1
25
0.119
0.2
12
0.191
0.0
66
0.037
0.0
99
0.017
0.1
51
0.082
0.0
32
0.064
0.0
52
0.069
0.0
48
0.172
6
0.138
0 4
0.138
0.1
31
0.212
0.1
91
0.058
0.0
37
0.091
0.0
17
0.151
0.0
82
0.032
0.0
64
0.052
0.0
69
0.048
0.1
72
6 0.1
380
5 0.1
38
0.131
0.2
37
0.215
0.0
75
0.041
0.1
12
0.019
0.1
69
0.094
0.0
35
. .
0.077
0.0
64
0.075
0.0
53
0.196
8 0.1
640
5 0.1
64
0.157
0.2
37
0.215
0.0
60
0.041
0.0
96
0.019
0.1
69
0.094
0.0
35
. .
. 0.0
77
0.064
0.0
75
0.053
0.1
96
8 0.1
640
6 0.
164
0.15
7 0.
262
0.23
%
0.076
0.0
45
0.117
0.0
21
0.188
0.1
06
0.038
0.0
89
0.075
0.0
80
0.057
0.2
20
10
0.190
0 8
0.190
0.1
81
0.312
0.2
85
0.094
0.0
76
0.141
0.0
25
0.224
0.1
24
0.043
.
. 0.1
13
0.099
0.0
91
0.066
0.2
67
5 12
0.2
160
8 0.2
16
0.207
0.3
12
0.285
0.0
78
0.076
0.1
25
0.025
0.2
24
0.124
0.0
43
. .
0.113
0.0
99
0.091
0.0
66
0.267
12
0.216
0 10
0.2
16
0.207
0.3
62
0.333
0.1
11
0.060
0.1
66
0.029
0.2
60
0.148
0.0
48
. 0.1
37
0.122
0.1
02
0.075
0.3
13
'/4
0.250
0 10
0.2
50
0.240
0.3
62
0.333
0.0
91
0.060
0.1
46
0.029
0.2
60
0.148
0.0
48
. 0.1
37
0.122
0.1
02
0.075
0.3
13
'/‘,
0.250
0 12
0.2
50
0.240
0.4
12
0.380
0.1
24
0.068
0.1
87
0.033
0.2
97
0.172
0.0
54
0.162
0.1
45
0.113
0.0
84
0.362
5/e
0.312
5 12
0.3
12
0.302
0.4
12
0.380
0.0
87
0.068
0.1
50
0.033
0.2
97
0.172
0.0
54
. 0.1
62
0.145
0.1
13
0.084
0.3
62
%
0.312
5 &
0.312
0.3
02
0.477
0.4
42
0.130
0.0
79
0.202
0.0
38
0.344
0.1
95
0.061
0.1
93
0.176
0.1
29
0.095
0.4
24
"/B
0.375
0 5/1
6 0.3
75
0.364
0.5
97
0.556
0.7
73
0.099
0.2
65
0.048
0.4
32
0.252
0.0
74
0.251
0.2
32
0.155
0.1
17
0.539
GENE
RAL
NOTE
S:
(a)
For
addit
ional
requ
irem
ents
refer
to
pa
ra.
2.
(b)
For
refer
ence
, se
e Ta
ble
8C
Illustr
ation
on
pre
vious
pa
ge.
NOTE
S:
(1)
Shor
t sc
rews
inc
lude
nom
inal
length
s up
to
an
d inc
luding
l'/s
in.
fo
r siz
es
No.
5 an
d sm
aller
, an
d 2
in.
for
sizes
No
. 6
and
large
r. (2
) W
here
spec
ifying
no
mina
l siz
e in
decim
als,
zeros
pre
cedin
g de
cimal
and
in the
fou
rth
decim
al pla
ce
shall
be
om
itted.
(3
) Ta
bulat
ed
value
s de
term
ined
from
for
mula
fo
r m
axim
um
H in
Appe
ndix
A.
(4)
Tabu
lated
va
lues
deter
mine
d fro
m
form
ula
for
max
imum
CJ
in
Appe
ndix
A.
(5)
Point
sa
me
on
all
drive
rs.
(6)
No
tolera
nce
for
gagin
g dia
mete
r is
given
. If
the
gagin
g dia
mete
r of
the
ga
ge
used
dif
fers
from
tab
ulated
va
lue,
the
protru
sion
will
be
affec
ted
acco
rding
ly an
d the
pro
per
protru
sion
value
s m
ust
be
recalc
ulated
us
ing
the
form
ulas
show
n in
Appe
ndix
I.
COPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling ServicesCOPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling Services
STDOASME BLB-b.3-ENGL L998 m 0757b70 ObL4220 b78
MACHINE SCREWS AND MACHINE SCREW NUTS ASME 818.6.3-1998
J - l Irtl
TABLE 9A DIMENSIONS OF SLOTTED PAN HEAD MACHINE SCREWS
Nominal Size or Basic Screw
Diameter
Head Head Diameter Head Height Slot Width Slot Depth Radius
A H J T R. LNote (111 Max. Min. Max. Min. Max. Max. Min. Max. Min.
~ ~ ~~~
O000 0.02 1 o O00 0.0340 O0 0.0470
0.042 0.036 0.016 0.010 0.007 0.066 0.060 0.023 0.017 0.010 0.090 0.082 0.032 0.025 0.015
0.008 0.012 0.017
0.004 0.008 0.010
0.008 0.004 0.012 0.008 0.016 0.010
0.116 0.104 0.039 0.031 0.020 0.142 0.130 0.046 0.038 0.025 0.167 0.155 0.053 0.045 0.035 O. 193 0.180 0.060 0.051 0.037
0.023 0.026 0.031 0.035
0.016 0.019 0.023 0.027
0.022 0.014 0.027 0.018 0.031 0.022 0.036 0.026
O 0.0600 1 0.0730 2 0.0860 3 0.0990
4 0.1120 5 0.1250 6 0.1380
0.2 19 0.205 0.068 0.058 0.042 0.245 0.231 0.075 0.065 0.044 0.270 0.256 0.082 0.072 0.046
0.039 0.043 0.048
0.031 0.035 0.039
0.040 0.030 0.045 0.034 0.050 0.037
8 0.1640 10 0.1900 12 0.2160
0.322 0.306 0.096 0.085 0.052 0.373 0.357 0.110 0.099 0.061 0.425 0.407 0.125 0.112 0.078
0.054 0.060 0.067
0.045 0.050 0.056
0.058 0.045 0.068 0.053 0.077 0.061
0.2500 5/16 0.3125
'Il6 0.4375
'/. 0.5000
'//B 0.6250 '/A 0.7500
'/B 0.3750
9/16 0.5625
0.492 0.473 0.144 0.130 0.087 0.615 0.594 0.178 0.162 0.099 0.740 0.716 0.2 12 0.195 0.143 0.863 0.837 0.247 0.228 O. 153
0.075 0.084 0.094 0.094
0.064 0.072 0.081 0.081
0.087 0.070 O. 106 0.085 O. 124 o. 1 O0 0.142 0.116
0.987 0.958 0.281 0.260 O. 175 1.041 1.000 0.315 0.293 O. 197 1.172 1.125 0.350 0.325 0.219 1.435 1.375 0.419 0.390 0.263
0.106 0.118 O. 133 0.149
0.091 0.102 0.116 0.131
0.161 0.131 0.179 0.146 O. 197 0.162 0.234 0.192
GENERAL NOTE: For additional requirements refer to para. 2. NOTE: (1) Where specifying nominal size in decimals, zeros preceding decimal and in the fourth decimal place shall be omitted.
48
COPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling ServicesCOPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling Services
MACHINE SCREWS AND MACHINE SCREW NUTS ASME 618.6.3-1998
This type of recess has a large I I
center opening, tapered wings, and blunt bottom, with all edges relieved or rounded.
TABLE 9B DIMENSIONS OF TYPE I CROSS RECESSED PAN HEAD MACHINE SCREWS
Nominal Size Head Head Head Recess Recess Recess or Basic Screw Diameter
A Height Radius Diameter H M
Depth Width Penetration
Diameter R [Note (1)J Max. Min. Max. Min. Min. Max. Min. Max. Min. Min. Size Max. Min.
T N, Driver Gaging Depth
O 0.0600 1 0.0730 2 0.0860 3 0.0990
4 0.1120 5 0.1250 6 0.1380
8 0.1640 10 0.1900 12 0.2160
'/4 0.2500
'4 0.3750 0.4375
'/2 0.5000
7 8 0.6250
v76 0.3125
9/16 0.5625
0.116 0.104 0.044 0.036 0.005 0.067 0.054 0.039 0.021 0.142 0.130 0.053 0.044 0.005 0.074 0.061 0.045 0.025 0.167 0.155 0.062 0.053 0.010 0.104 0.091 0.059 0.041 0.193 0.180 0.071 0.062 0.010 0.112 0.099 0.068 0.050
0.219 0.205 0.080 0.070 0.010 0.122 0.109 0.078 0.060 0.245 0.231 0.089 0.079 0.015 0.158 0.145 0.083 0.057 0.270 0.256 0.097 0.087 0.015 0.166 0.153 0.091 0.066
0.322 0.306 0.115 0.105 0.015 0.182 0.169 0.108 0.082 0.373 0.357 0.133 0.122 0.020 0.199 0.186 0.124 0.100 0.425 0.407 0.151 0.139 0.025 0.259 0.246 0.141 0.115
0.492 0.473 0.175 0.162 0.035 0.281 0.268 0.161 0.135 0.615 0.594 0.218 0.203 0.040 0.350 0.337 0.193 0.169 0.740 0.716 0.261 0.244 0.040 0.389 0.376 0.233 0.210 0.863 0.837 0.305 0.284 0.050 0.413 0.400 0.259 0.234
0.987 0.958 0.348 0.325 0.055 0.435 0.422 0.280 0.255 1.041 1.000 0.391 0.366 0.065 0.470 0.447 0.312 0.288 1.172 1.125 0.434 0.406 0.075 0.587 0.564 0.343 0.314
0.013 0.014 0.017 0.019
0.019 0.028 0.028
0.030 0.031 0.034
0.036 0.059 0.065 0.068
0.071 0.076 0.081
O 0.032 0.014 O 0.040 0.022 1 0.052 0.034 1 0.061 0.043
1 0.071 0.053 2 0.072 0.046 2 0.080 0.055
2 0.097 0.071 2 0.113 0.089 3 0.124 0.098
3 0.144 0.118 4 0.173 0.149 4 0.213 0.190 4 0.239 0.214
4 0.260 0.235 4 0.292 0.268 5 0.310 0.281
GENERAL NOTE: For additional requirements refer to para. 2. NOTE: (1) Where specifying nominal size in decimals, zeros preceding decimal and in the fourth decimal place shall be omitted.
49
COPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling ServicesCOPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling Services
STDOASME BLB-b.3-ENGL L998 m 0759670 ObLV222 460 m
ASME 818.6.3-1998 MACHINE SCREWS AND MACHINE SCREW NUTS
This type of recess has a large center opening, wide straight wings, and blunt bottom, with all edges relieved or rounded.
TABLE 9C DIMENSIONS OF TYPE IA CROSS RECESSED PAN HEAD MACHINE SCREWS
Nominal Size or Basic Screw Diameter Diameter [Note
Head Head Head Recess Recess Depth Width
Recess Penetration Height Radius Diameter
R, H M T N, Driver Gaging Depth A
(111 Max. Min. Max. Min. Min. Max. Min. Max. Min. Min. Size Max. Min.
O 0.0600 1 0.0730 2 0.0860 3 0.0990
4 0.1120 5 0.1250 6 0.1380
8 0.1640 10 0.1900 12 0.2160
74 0.2500 5/16 0.3125 '/e 0.3750
'/le 0.4375
'/2 0.5000 916 0.5625 '/e 0.6250 '/4 0.7500
0.116 0.104 0.044 0.036 0.005 0.142 0.130 0.053 0.044 0.005 0.167 0.155 0.062 0.053 0.010 0.193 0.180 0.071 0.062 0.010
0.219 0.205 0.080 0.070 0.010 0.245 0.231 0.089 0.079 0.015 0.270 0.256 0.097 0.087 0.015
0.322 0.306 0.115 0.105 0.015 0.373 0.357 0.133 0.122 0.020 0.425 0.407 0.151 0.139 0.025
0.492 0.473 0.175 0.162 0.035 0.615 0.594 0.218 0.203 0.040 0.740 0.716 0.261 0.244 0.040 0.863 0.837 0.305 0.284 0.050
0.987 0.958 0.348 0.325 0.055 1.041 1.000 0.391 0.366 0.065 1.172 1.125 0.434 0.406 0.075 1.435 1.375 0.521 0.488 0.085
0.067 0.054 0.040 0.024 0.018 0.074 0.061 0.047 0.031 0.018 0.104 0.091 0.064 0.048 0.028 0.112 0.099 0.073 0.057 0.029
0.122 0.109 0.083 0.067 0.029 0.154 0.141 0.084 0.066 0.040 0.162 0.149 0.092 0.074 0.040
0.177 0.164 0.108 0.090 0.041 0.193 0.180 0.124 0.106 0.041 0.254 0.241 0.139 0.121 0.056
0.273 0.260 0.159 0.141 0.057 0.341 0.328 0.191 0.173 0.086 0.377 0.364 0.228 0.210 0.086 0.399 0.386 0.251 0.233 0.086
0.420 0.407 0.273 0.255 0.086 0.456 0.433 0.304 0.286 0.087 0.570 0.547 0.333 0.312 0.098 0.614 0.591 0.379 0.358 0.098
O O 1 1
1 2 2
2 2 3
3 4 4 4
4 4 5 5
0.033 0.017 0.040 0.024 0.053 0.037 0.062 0.046
0.072 0.056 0.068 0.050 0.076 0.058
0.092 0.074 0.108 0.090 0.117 0.099
0.137 0.119 0.164 0.146 0.201 0.183 0.224 0.206
0.246 0.228 0.277 0.259 0.295 0.274 0.341 0.320
GENERAL NOTE: For additional requirements refer to para. 2. NOTE: (1) Where specifying nominal size in decimals, zeros preceding decimal and in the fourth decimal place shall be omitted.
50
COPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling ServicesCOPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling Services
MACHINE SCREWS AND MACHINE SCREW NUTS ASME B18.6.3-1998
This type of recess consists of two intersecting slots with parallel sides converging to a slightly truncated apex at bottom of recess.
TABLE 9D DIMENSIONS OF TYPE II CROSS RECESSED PAN HEAD MACHINE SCREWS
Nominal Size or Basic Screw Diameter [Note
(Il1
O 0.0600 1 0.0730 2 0.0860 3 0.0990
4 0.1120 5 0.1250 6 0.1380
8 0.1640 10 0.1900 12 0.2160
0.2500 5/16 0.3125 '/8 0.3750
'/16 0.4375
'/2 0.5000 0.5625
'/a 0.6250 0.7500
Head Diameter
A
Head Height H
Max. Min. Max. Min.
0.116 0.104 0.142 0.130 0.167 0.155 0.193 0.180
0.044 0.036 0.053 0.044 0.062 0.053 0.071 0.062
Head Radius
R. Min.
0.005 0.005 0.010 0.010
Recess Diameter
M
Recess Depth
T
Max. Min. Max. Min.
Recess Width Driver N. Size
Min. [Note (2)l
Recess Penetration
Gaging Depth
Max. Min.
0.076 0.066 0.089 0.079 0.109 0.097 0.125 0.113
0.038 0.026 0.046 0.034 0.059 0.046 0.069 0.056
0.022 . . . 0.024 . . . 0.027 . . . 0.029 . . .
Note (3) Note (3) Note (3) Note (3)
0.033 0.022 0.043 0.032
0.219 0.205 0.080 0.070 0.010 0.143 0.130 0.079 0.066 0.032 . . . 0.055 0.043 0.245 0.231 0.089 0.079 0.015 0.159 0.145 0.090 0.076 0.034 . . . 0.066 0.052 0.270 0.256 0.097 0.087 0.015 0.176 0.162 0.096 0.082 0.037 . . . 0.077 0.064
0.322 0.306 0.115 0.105 0.015 0.207 0.192 0.116 0.101 0.041 . . . 0.097 0.083 0.373 0.357 0.133 0.122 0.020 0.240 0.224 0.137 0.122 0.046 . . . 0.118 0.104 0.425 0.407 0.151 0.139 0.025 0.272 0.254 0.158 0.142 0.051 . . . 0.139 0.124
0.492 0.473 0.175 0.162 0.035 0.318 0.300 0.180 0.163 0.058 . . . 0.169 0.153 0.615 0.594 0.218 0.203 0.040 0.396 0.375 0.231 0.212 0.069 . . . 0.220 0.202 0.740 0.716 0.261 0.244 0.040 0.480 0.457 0.286 0.266 0.081 . . . 0.275 0.256 0.863 0.837 0.305 0.284 0.050 0.557 0.531 0.336 0.314 0.093 . . . 0.325 0.304
0.987 0.958 0.348 0.325 0.055 0.630 0.604 0.384 0.362 0.104 . . . 0.373 0.352 1.041 1.000 0.391 0.366 0.065 0.638 0.612 0.389 0.367 0.105 . . . 0.378 0.357 1.172 1.125 0.434 0.406 0.075 0.638 0.612 0.389 0.367 0.105 . . . 0.378 0.357 1.435 1.375 0.521 0.488 0.085 0.638 0.612 0.389 0.367 0.105 . . . 0.378 0.357
GENERAL NOTE: For additional requirements refer to para. 2. NOTES: (1) Where specifying nominal size in decimals, zeros preceding decimal and in the fourth decimal place shall be omitted. (2) Point same on all drivers. (3) Not practical to gage.
51
COPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling ServicesCOPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling Services
ASME 818.6.3-1998 MACHINE SCREWS AND MACHINE SCREW NUTS
J 2 1 Tu Note (l)
TABLE 10A DIMENSIONS OF SLOlTED FILLISTER HEAD MACHINE SCREWS
Nominal Size or Basic Screw Diameter [Note
Head Head Side Total Head Slot Slot Diameter Height Height Width Depth
A H O J T
(211 Max. Min. Max. Min. Max. Min. Max. Min. Max. Min.
O000 0.02 1 o O00 0.0340 O0 0.0470
O 0.0600 1 0.0730 2 0.0860 3 0.0990
4 0.1120 5 0.1250 6 0.1380
8 0.1640 10 0.1900 12 0.2160
'/4 0.2500 0.3125
"/8 0.3750 0.4375
'/2 0.5000 '/le 0.5625
5/8 0.6250 3/, 0.7500
0.038 0.059 0.082
0.096 0.118 0.140 0.161
0.183 0.205 0.226
0.270 0.313 0.357
0.414 0.518 0.622 0.625
0.750 0.812 0.875 1 .O00
0.032 0.053 0.072
0.083 0.104 0.124 0.145
0.166 0.187 0.208
0.250 0.292 0.334
0.389 0.490 0.590 0.589
0.710 0.768 0.827 0.945
0.019 0.029 0.037
0.043 0.053 0.062 0.070
0.079 0.088 0.096
0.113 0.130 0.148
0.170 0.21 1 0.253 0.265
0.297 0.336 0.375 0.441
0.01 1 0.021 0.028
0.038 0.045 0.053 0.061
0.069 0.078 0.086
o. 1 o2 0.118 O. 134
O. 155 0.194 0.233 0.242
0.273 0.308 0.345 0.406
0.025 0.015 0.008 0.004 0.012 0.006 0.035 0.027 0.012 0.006 0.017 0.011 0.047 0.039 0.017 0.010 0.022 0.015
0.055 0.047 0.023 0.016 0.025 0.015 0.066 0.058 0.026 0.019 0.031 0.020 0.083 0.066 0.031 0.023 0.037 0.025 0.095 0.077 0.035 0.027 0.043 0.030
0.107 0.088 0.039 0.031 0.048 0.035 0.120 0.100 0.043 0.035 0.054 0.040 0.132 0.111 0.048 0.039 0.060 0.045
0.156 0.133 0.054 0.045 0.071 0.054 0.180 0.156 0.060 0.050 0.083 0.064 0.205 0.178 0.067 0.056 0.094 0.074
0.237 0.207 0.075 0.064 0.109 0.087 0.295 0.262 0.084 0.072 0.137 0.110 0.355 0.315 0.094 0.081 0.164 0.133 0.368 0.321 0.094 0.081 0.170 0.135
0.412 0.362 0.106 0.091 0.190 0.151 0.466 0.410 0.118 0.102 0.214 0.172 0.521 0.461 0.133 0.116 0.240 0.193 0.612 0.542 0.149 0.131 0.281 0.226
GENERAL NOTE: For additional requirements refer to para. 2. NOTES: (1) A slight rounding of the edges at periphery of head shall be permissible provided the diameter of the bearing circle is equal
(2) Where specifying nominal size in decimals, zeros preceding decimal and in the fourth decimal place shall be omitted. to no less than 90% of the specified minimum head diameter.
52
COPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling ServicesCOPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling Services
Thist
ype
of
rece
ss
has
a la
rge
z ce
nter
open
ing,ta
pere
d wi
ngs,
an
d bl
untb
otto
m,w
ith
all
s ed
ges
relie
ved
or
roun
ded.
z
TABL
E 10
B D
IMEN
SIO
NS
OF
TYPE
I
CR
OSS
R
ECES
SED
FI
LLIS
TER
H
EAD
M
ACH
INE
SCR
EWS
z G
Nom
inal
Size
or
Basic
Sc
rew
Diam
eter
[Not
e (2
11
Head
Di
amete
r
A
Max
. M
in.
Head
Sid
e To
tal
Head
Re
cess
Heigh
t He
ight
Diam
eter
H 0
M
Max
. M
in.
Max
. M
in.
Max
. M
in.
Rece
ss
Depth
T
Max
. M
in.
Rece
ss
Widt
h N,
Min.
Drive
r
Size
Rece
ss
d
Pene
tratio
n E
Gagin
g De
pth
;;1
Max
. M
in.
0 0.
0600
0.0
96
0.08
3 0.
043
0.03
8 0.
055
0.04
7 0.
067
0.05
4 0.0
39
0.02
1 0.
013
1 0.
0730
0.
118
0.10
4 0.
053
0.04
5 0.
066
0.05
8 0.
074
0.06
1 0.
045
0.02
5 0.
014
2 2
0.08
60
0.14
0 0.
124
0.06
2 0.
053
0.08
3 0.
066
0.10
4 0.
091
0.05
9 0.
041
0.01
7 3
0.09
90
0.16
1 0.
145
0.07
0 0.
061
0.09
5 0.
077
0.11
2 0.
099
0.06
8 0.
050
0.01
9
0.03
2 0.
014
0.04
0 0.
022
0.05
2 0.
034
0.06
1 0.
043
4 0.
1120
0.
183
0.16
6 0.
079
0.06
9 0.
107
0.08
8 0.
122
0.10
9 0.
078
0.06
0 0.
019
1 0.
071
0.05
3 5
0.12
50
0.20
5 0.
187
0.08
8 0.
078
0.12
0 0.
100
0.14
3 0.
130
0.06
7 0.
042
0.02
7 2
0.05
6 0.
031
6 0.
1380
0.
226
0.20
8 0.
096
0.08
6 0.
132
0.11
1 0.
166
0.15
3 0.
091
0.06
6 0.
028
2 0.
080
0.05
5
8 0.
1640
0.
270
0.25
0 0.
113
0.10
2 0.
156
0.13
3 0.
182
0.16
9 0.
108
0.08
2 0.
030
2 0.0
97
0.07
1 10
0.
1900
0.
313
0.29
2 0.
130
0.11
8 0.
180
0.15
6 0.
199
0.18
6 0.
124
0.10
0 0.
031
2 0.
113
0.08
9 12
0.
2160
0.
357
0.33
4 0.
148
0.13
4 0.
205
0.17
8 0.
259
0.24
6 0.
141
0.11
5 0.
034
3 0.
124
0.09
8
'L,
0.25
00
0.41
4 0.
389
0.17
0 0.
155
0.23
7 0.
207
0.28
1 0.
268
0.16
1 0.
135
0.03
6 5/
6 0.
3125
0.
518
0.49
0 0.
211
0.19
4 0.
295
0.26
2 0.
322
0.30
9 0.
203
0.17
7 0.
042
3/,
0.37
50
0.62
2 0.
590
0.25
3 0.
233
0.35
5 0.
315
0.38
9 0.
376
0.23
3 0.
210
0.06
5 7/
s 0.
4375
0.
625
0.58
9 0.
265
0.24
2 0.
368
0.32
1 0.
413
0.40
0 0.
259
0.23
4 0.
068
0.144
0.
118
0.18
6 0.
160
0.21
3 0.
190
0.23
9 0.
214
Y*
0.50
00
9/6
0.56
25
"/8
0.62
50
0.75
0 0.
812
0.87
5
0.71
0 0.
768
0.82
7
0.29
7 0.
336
0.37
5 0.
441
0.27
3 0.
308
0.34
5
0.41
2 0.
466
0.52
1 0.
612
0.36
2 0.
410
0.46
1 0.
542
0.43
5 0.
470
0.58
7 0.
633
0.42
2 0.
442
0.56
4 0.
610
0.28
0 0.
312
0.34
3 0.
382
0.25
5 0.
071
4 0.
260
0.23
5 0.
288
0.07
6 4
0.29
2 0.
268
0.31
4 0.
081
5 0.
310
0.28
1 g
"/4
0.75
00
1 .oo
o 0.
945
0.40
6 0.
355
0.08
6 5
0.34
9 0.
322
2 m
GEN
ERAL
NO
TE:
For
addi
tiona
l re
quire
men
ts re
fer
to
para
. 2.
L%
NO
TES:
b,
(1)
A sl
ight
ro
undin
g of
th
e ed
ges
at
perip
hery
of
he
ad
shal
l be
pe
rmiss
ible
pr
ovide
d th
e dia
met
er
of
the
bear
ing
circ
le
is
equa
l to
no
le
ss
than
90
%
of
the
spec
ified
2 m
inim
um
head
dia
met
er.
(2)
Whe
re
spec
ifyin
g no
min
al
size
in
decim
als,
zero
s pr
eced
ing
decim
al
and
in
the
four
th
decim
al
plac
e sh
all
be
omitt
ed.
Ei
COPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling ServicesCOPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling Services
This
typ
e of
re
cess
ha
s a
larg
e ce
nter
op
enin
g,
wide
st
raig
ht
wing
s,
and
blun
t bo
ttom
, wi
th
all
edge
s re
lieve
d or
ro
unde
d.
TABL
E 1 O
C IL
LUST
RAT
ION
COPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling ServicesCOPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling Services
Fi
TABL
E IO
C
DIM
ENSI
ON
S O
F TY
PE
IA C
RO
SS
REC
ESSE
D
FILL
ISTE
R
HEA
D
MAC
HIN
E SC
REW
S %
z Ifi
No
mina
l Siz
e
or
Basic
Sc
rew
Diam
eter
[Not
e (2
11
-
Head
Di
amete
r
A
Max
. M
in.
Head
Sid
e To
tal
Head
Re
cess
Heigh
t He
ight
Diam
eter
H 0
M
Max
. M
in.
Max
. M
in.
Max
. M
in.
Rece
ss
Depth
T
Max
. M
in.
Rece
ss
Rece
ss
g
Widt
h Pe
netra
tion
Gagin
g De
pth
$ N.
Dr
iver
Min.
Siz
e M
ax.
Min.
5 2
0 0.
0600
0.0
96
0.08
3 0.
043
0.03
8 0.
055
0.04
7 0.
067
0.05
4 0.
040
0.02
4 0.
018
1 0.
0730
0.
118
0.10
4 0.
053
0.04
5 0.
066
0.05
8 0.
074
0.06
1 0.
047
0.03
1 0.
018
2 0.
0860
0.
140
0.12
4 0.
062
0.05
3 0.
083
0.06
6 0.
104
0.09
1 0.
064
0.04
8 0.
028
3 0.
0990
0.
161
0.14
5 0.
070
0.06
1 0.
095
0.07
7 0.
112
0.09
9 0.
073
0.05
7 0.
029
4 0.
1120
5
0.12
50
6 0.
1380
8 0.
1640
10
0.
1900
2
12
0.21
60
'/4
0.25
00
hi
0.31
25
"/8
0.37
50
%6
0.43
75
5;
0.50
00
g/,6
0.
5625
?'8
0.62
50
"/4
0.75
00
0.18
3 0.
166
0.07
9 0.
069
0.10
7 0.
088
0.12
2 0.
109
0.08
3 0.
067
0.02
9 1
0.07
2 0.
056
E 0.
205
0.18
7 0.
088
0.07
8 0.
120
0.10
0 0.
140
0.12
7 0.
070
0.05
2 0.
040
2 0.
054
0.03
6 2
0.22
6 0.
208
0.09
6 0.
086
0.13
2 0.
111
0.16
2 0.
149
0.09
2 0.
074
0.04
0 2
0.07
6 0.
058
0.27
0 0.
250
0.11
3 0.
102
0.15
6 0.
133
0.17
7 0.
164
0.10
8 0.
090
0.04
1 2
0.092
0.
074
0.31
3 0.
292
0.13
0 0.
118
0.18
0 0.
156
0.19
3 0.
180
0.12
4 0.
106
0.04
1 2
0.10
8 0.
090
0.35
7 0.
334
0.14
8 0.
134
0.20
5 0.
178
0.25
4 0.
241
0.13
9 0.
121
0.05
6 3
0.11
7 0.
099
0.41
4 0.3
89
0.17
0 0.
155
0.23
7 0.
207
0.27
3 0.
260
0.15
9 0.
141
0.05
7
0.51
8 0.
490
0.21
1 0.
194
0.29
5 0.
262
0.31
5 0.
302
0.20
2 0.
184
0.05
7 0.
622
0.59
0 0.
253
0.23
3 0.
355
0.31
5 0.
377
0.36
4 0.
228
0.21
0 0.
086
0.62
5 0.
589
0.26
5 0.
242
0.36
8 0.
321
0.39
9 0.
386
0.25
1 0.
233
0.08
6
0.75
0 0.
710
0.29
7 0.
273
0.41
2 0.
362
0.42
0 0.
407
0.27
3 0.
255
0.08
6 0.
812
0.76
8 0.
336
0.30
8 0.
466
0.41
0 0.
456
0.43
3 0.
304
0.28
6 0.
087
0.87
5 0.
827
0.37
5 0.
345
0.52
1 0.
461
0.57
0 0.
547
0.33
3 0.
312
0.09
8 1.
000
0.94
5 0.
441
0.40
6 0.
612
0.54
2 0.
614
0.59
1 0.
379
0.35
8 0.
098
0.03
3 0.
040
0.05
3 0.
062
0.13
7 0.1
19
0.18
1 0.
163
0.20
1 0.
183
0.22
4 0.
206
0.24
6 0.
228
0.27
7 0.
259
0.29
5 0.
274
0.34
1 0.
320
0.01
7 g
0.02
4 0.
037
i?
0.04
6 2 z
GEN
ERAL
NOTE
S:
(a)
For
addi
tiona
l re
quire
men
ts re
fer
to
para
. 2.
(b
) Fo
r re
fere
nce,
se
e Ta
ble
1OC
illust
ratio
n on
pr
eviou
s pa
ge.
NOTE
S:
(I)
A sl
ight
ro
undin
g of
th
e ed
ges
at
perip
hery
of
he
ad
shal
l be
pe
rmiss
ible
pr
ovide
d th
e dia
met
er
of
the
bear
ing
circ
le
is
equa
l to
no
le
ss
than
90
%
of
the
spec
ified
min
imum
he
ad
diam
eter
. (2
) W
here
sp
ecify
ing
nom
inal
siz
e in
de
cimal
s,
zero
s pr
eced
ing
decim
al
and
in
the
four
th
decim
al
plac
e sh
all
be
omitt
ed.
COPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling ServicesCOPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling Services
This
typ
e of
re
cess
co
nsis
ts
of
two
inte
rsec
ting
slot
s wi
th
para
llel
side
s co
nver
ging
to
a sli
ghtly
tru
ncat
ed
apex
at
bo
ttom
of
re
cess
.
TABL
E 10
D
DIM
ENSI
ON
S O
F TY
PE
II C
RO
SS
REC
ESSE
D
FILL
ISTE
R
HEA
D
MAC
HIN
E SC
REW
S
Nom
inal
Size
Head
He
ad
Side
Tota
l He
ad
Rece
ss
or
Basic
Sc
rew
Diam
eter
Heigh
t He
ight
Diam
eter
Rece
ss
Depth
Re
cess
Pe
netra
tion
Diam
eter
A H
0 M
T Re
cess
W
idth
Dr
iver
N Si
ze
Gagin
g De
pth
[Not
e HI
M
ax.
Min.
M
ax.
Min.
M
ax.
Min.
M
ax.
Min.
M
ax.
Min.
M
in.
[Not
e (31
1 M
ax.
Min.
0 0.
0600
0.0
96
0.08
3 0.
043
0.03
8 0.
055
0.04
7 0.
072
0.06
2 0.
035
0.02
3 0.
020
Note
(4
) No
te
(4)
1 0.
0730
0.
118
0.10
4 0.
053
0.04
5 0.
066
0.05
8 0.
088
0.07
8 0.
045
0.03
4 0.
022
Note
(4
) No
te
(4)
2 0.
0860
0.
140
0.12
4 0.
062
0.05
3 0.
083
0.06
6 0.
105
0.09
3 0.
056
0.04
4 0.
024
0.03
0 0.
019
3 0.
0990
0.
161
0.14
5 0.
070
0.06
1 0.
095
0.07
7 0.
121
0.10
9 0.
067
0.05
4 0.
027
0.04
1 0.
029
4 0.
1120
0.
183
5 0.
1250
0.
205
6 0.
1380
0.
226
0.07
9
0.08
8 0.
096
0.06
9
0.07
8 0.
086
0.10
7
0.12
0 0.
132
0.08
8
0.10
0 0.
111
0.13
7
0.15
4 0.
170
0.12
4
0.14
0 0.
156
0.07
7
0.08
6 0.
097
0.06
4
0.07
2 0.
083
0.02
9
0.03
1 0.
034
8 0.
1640
10
0.
1900
12
0.
2160
'/4
0.25
00
%I3
0.
3125
"/8
0.
3750
7/
pj
0.43
75
'/*
0.50
00
g/,6
0.
5625
5/
8 0.
6250
"/4
0.
7500
0.27
0 0.
313
0.35
7
0.16
6 0.
051
0.03
9
0.18
7 0.
062
0.04
9 0.
208
0.07
3 0.
060
0.25
0 0.
094
0.08
0 0.
292
0.11
5 0.
101
z 0.
334
0.13
7 0.
121
5
0.38
9
0.49
0 0.
590
0.58
9
0.11
3 0.
130
0.14
8
0.10
2 0.
118
0.13
4
0.15
6 0.
180
0.20
5
0.13
3 0.
156
0.17
8
0.20
2 0.
235
0.26
8
0.18
7 0.
219
0.25
0
0.11
8 0.
134
0.15
6
0.10
3 0.
119
0.13
9
0.03
9 0.
043
0.04
8
0.41
4
0.51
8 0.
622
0.62
5
0.17
0 0.
211
0.25
3
0.26
5
0.15
5 0.
194
0.23
3 0.
242
0.23
7
0.29
5 0.
355
0.36
8
0.20
7 0.
262
0.31
5
0.32
1
0.30
8
0.38
8 0.
466
0.46
6
0.29
0
0.36
7 0.
442
0.44
2
0.18
2
0.22
6 0.
277
0.27
7
0.16
5
0.20
7 0.
256
0.25
6
0.05
4
0.06
6 0.
077
0.07
7
0.09
1 0.
097
0.09
7 0.
097
0.16
3 0.
163
0.14
7 0.
147
K K
0.21
5 0.
215
0.19
7 0.
197
: : 0.
266
0.26
6 0.
246
0.24
6 2 2
0.26
6 0.
266
0.24
6 0.
246
D D - -
0.75
0 0.
812
0.87
5 1.
000
0.71
0 0.
768
0.82
7 0.
945
m
0.29
7 0.
336
0.37
5 0.
441
0.27
3 0.
308
0.34
5 0.
406
0.41
2 0.
466
0.52
1 0.
612
0.36
2 0.
410
0.46
1 0.
542
0.56
2 0.
609
0.60
9 0.
609
0.53
2 0.
576
0.57
6 0.
576
0.33
9 0.
370
0.37
0 0.
370
0.31
5 0.
343
0.34
3 0.
343
0.32
8 0.
305
6
0.35
9 0.
333
$ 0.
359
0.33
3 2
0.35
9 0.
333
2
GEN
ERAL
NO
TE:
For
addi
tiona
l re
quire
men
ts re
fer
to
para
. 2.
E
NOTE
S:
z (I)
A
slig
ht
roun
ding
of
the
edge
s at
pe
riphe
ry
of
head
sh
all
be
perm
issib
le
prov
ided
the
diam
eter
of
th
e be
aring
ci
rcle
is
eq
ual
to
no
less
th
an
90%
of
th
e sp
ecifie
d z
min
imum
he
ad
diam
eter
. (2
) W
here
sp
ecify
ing
nom
inal
siz
e in
de
cimal
s,
zero
s pr
eced
ing
decim
al
and
in
the
four
th
decim
al
plac
e sh
all
be
omitt
ed.
(3)
Poin
t sa
me
on
all
drive
rs.
(4)
Not
prac
tical
to
ga
ge.
COPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling ServicesCOPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling Services
MACHINE SCREWS AND MACHINE SCREW NUTS ASME 618.6.3-1998
Note (1)
TABLE 11 DIMENSIONS OF SLOTTED DRILLED FILLISTER HEAD MACHINE SCREWS
Nominal Size Drilled Hole Drilled Hole Location Diameter
Diameter E, Basic F, Basic [Note [3)] Max. Min. Max. Min. Max. Min. Max. Min. Max. Min. [Note 1111 [Note (111
2 0.0860 0.140 0.124 0.062 0.055 0.083 0.070 0.031 0.023 0.030 0.022 0.026 0.031 3 0.0990 0.161 0.145 0.070 0.064 0.095 0.082 0.035 0.027 0.034 0.026 0.030 0.037
Head Head Side Total Head Slot
A H O J T Height Height Slot Width Depth or Basic Screw IIiameter
4 0.1120 0.183 0.166 0.079 0.072 0.107 0.094 0.039 0.031 0.038 0.030 0.035 0.037 5 0.1250 0.205 0.187 0.088 0.081 0.120 0.106 0.043 0.035 0.042 0.033 0.038 0.046 6 0.1380 0.226 0.208 0.096 0.089 0.132 0.118 0.048 0.039 0.045 0.035 0.043 0.046
8 0.1640 0.270 0.250 0.113 0.106 0.156 0.141 0.054 0.045 0.065 0.054 0.043 0.046 10 0.1900 0.313 0.292 0.130 0.123 0.180 0.165 0.060 0.050 0.075 0.064 0.043 0.046 12 0.2160 0.357 0.334 0.148 0.139 0.205 0,188 0.067 0.056 0.087 0.074 0.053 0.046
'/4 0.2500 0.414 0.389 0.170 0.161 0.237 0.219 0.075 0.064 0.102 0.087 0.062 0.062 5/16 0.3125 0.518 0.490 0.211 0.201 0.295 0.276 0.084 0.072 0.130 0.110 0.078 0.070 3/s 0.3750 0.622 0.590 0.253 0.242 0.355 0.333 0.094 0.081 0.154 0.134 0.094 0.070
GENERAL NOTE: For additional requirements refer to para. 2. NOTES: (1) Drilled hole shall be approximately perpendicular to the axis of slot and may be permitted to break through bottom of the
(2) A slight rounding of the edges at periphery of head shall be permissible provided the diameter of the bearing circle is equal
(3) Where specifying nominal size in decimals, zeros preceding decimal and in the fourth decimal place shall be omitted.
slot. Edges of the hole shall be free from burrs.
to no less than 90% of the specified minimum head diameter.
57
COPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling ServicesCOPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling Services
STD-ASME BLB.b.3-ENGL L998 0759670 Ob34230 537 H
ASME 818.6.3-1998 MACHINE SCREWS AND MACHINE SCREW NUTS
TABLE IZA DIMENSIONS OF SLOTTED TRUSS HEAD MACHINE SCREWS
Nominal Size or Basic Screw
Diameter
Head Head Slot Slot Head Diameter Height Radius Width Depth
A H J T R, [Note (111 Max. Min. Max. Min. Max. Max. Min. Max. Min.
O000 0.0210 0.049 0.043 0.014 0.010 0.032 0.009 0.005 0.009 0.005 O00 0.0340 0.077 0.071 0.022 0.018 0.051 0.013 0.009 0.013 0.009 O0 0.0470 0.106 0.098 0.030 0.024 0.070 0.017 0.010 0.018 0.012
O 0.0600 0.131 0.119 0.037 0.029 0.087 0.023 0.016 0.022 0.014 1 0.0730 O. 164 0.149 0.045 0.037 0.107 0.026 0.019 0.027 0.018 2 0.0860 0.194 O. 180 0.053 0.044 o. 129 0.031 0.023 0.031 0.022 3 0.0990 0.226 0.21 1 0.061 0.051 0.151 0.035 0.027 0.036 0.026
4 0.1120 0.257 0.241 0.069 0.059 0.169 0.039 0.031 0.040 0.030 5 0.1250 0.289 0.272 0.078 0.066 0.191 0.043 0.035 0.045 0.034 6 0.1380 0.321 0.303 0.086 0.074 0.21 1 0.048 0.039 0.050 0.037
8 0.1640 0.384 0.364 0.102 0.088 0.254 0.054 0.045 0.058 0.045
12 0.2160 0.51 1 O. 487 O. 134 0.1 18 0.336 0.067 0.056 0.077 0.061 10 0.1900 0.448 0.425 0.118 O. 103 0.283 0.060 0.050 0.068 0.053
0.2500 0.573 0.546 0.150 0.133 0.375 0.075 0.064 0.087 0.070 '/,e 0.3125 0.698 0.666 0.183 0.162 0.457 0.084 0.072 O. 106 0.085 3/8 0.3750 0.823 0.787 0.215 0.191 0.538 0.094 0.081 O. 124 o. 1 O0
'/,G 0.4375 0.948 0.907 0.248 0.221 0.619 0.094 0.081 O. 142 0.116
0.5000 1 .O73 1 .O28 0.280 0.250 0.701 0.106 0.091 0.161 0.131 '416 0.5625 1.198 1.149 0.312 0.279 0.783 0.118 0.102 0.179 0.146
0.6250 1.323 1.269 0.345 0.309 0.863 0.133 0.116 0.196 O. 162 0.7500 1.573 1.51 1 0.410 0.368 1 .O24 0.149 0.131 0.234 0.182
GENERAL NOTE: For additional requirements refer to para. 2. NOTE: (1) Where specifying nominal size in decimals, zeros preceding decimal and in the fourth decimal place shall be omitted.
58
COPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling ServicesCOPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling Services
STD.ASME B18-6-3-ENGL 1798 0757670 Ob14231 473 m
MACHINE SCREWS AND MACHINE SCREW NUTS
This type of recess has a large center opening, tapered wings, and blunt bottom, with all edges relieved or rounded.
ASME 818.6.3-1998
Optional Shoulder for Long Screws With Reduced Body
TABLE 12B DIMENSIONS OF TYPE I CROSS RECESSED TRUSS HEAD MACHINE SCREWS
Nominal Size Head Head Recess Recess Height Diameter Depth
Recess Width
Recess Penetration or Basic Screw Oiameter
A H M J Diameter N. ~~i~~~ Gaging Depth [Note (111 Max. Min. Max. Min. Max. Min. Max. Min. Min. Size Max. Min.
O 0.0600 1 0.0730 2 0.0860 3 0.0990
4 0.1120 5 0.1250 6 0.1380
8 0.1640 10 0.1900 12 0.2160
'/4 0.2500 0.3125
"/8 0.3750 '116 0.4375
'/z 0.5000 '115 0.5625 '18 0.6250 '14 0.7500
0.131 O. 164 O. 194 0.226
0.257 0.289 0.321
0.384 0.448 0.51 1
0.573 0.698 0.823 0.948
1 .O73 1.198 1.323 1.573
0.119 0.149 O. 180 0.21 1
0.241 0.272 0.303
0.364 0.425 0.487
0.546 0.666 0.787 0.907
1 .O28 1.149 1.269 1.511
0.037 0.045 0.053 0.061
0.069 0.078 0.086
o. 1 o2 0.1 18 O. 134
O. 150 0.183 0.215 0.248
0.280 0.312 0.345 0.410
0.029 0.037 0.044 0.051
0.059 0.066 0.074
0.088 0.103 0.118
0.133 0.162 0.191 0.221
0.250 0.279 0.309 0.368
0.063 0.071 0.104 0.110
0.112 0.128 O. 158
0.173 0.188 0.248
0.263 0.352 0.383 0.414
0.444 0.451 0.559 0.620
0.050 0.058 0.091 0.097
0.099 0.115 0.145
0.160 0.175 0.235
0.250 0.339 0.370 0.401
0.431 0.428 0.536 0.597
0.037 0.019 0.045 0.027 0.059 0.041 0.066 0.049
0.069 0.051 0.085 0.067 0.084 0.059
0.099 0.074 0.115 0.090 0.128 0.103
0.143 0.118 0.193 0.168 0.226 0.202 0.257 0.232
0.288 0.263 0.302 0.278 0.322 0.289 0.384 0.352
0.013 O 0.014 O 0.018 1 0.018 1
0.018 1 0.019 1 0.027 2
0.029 2 0.030 2 0.032 3
0.033 3 0.059 4 0.063 4 0.068 4
0.072 4 0.074 4 0.077 5 0.085 5
0.030 0.012 0.038 0.020 0.052 0.034 0.059 0.042
0.062 0.044 0.078 0.060 0.073 0.048
0.088 0.063 0.104 0.079 O. 11 1 0.086
0.126 0.101 0.173 0.148 0.206 0.182 0.237 0.212
0.268 0.243 0.282 0.258 0.289 0.256 0.351 0.319
GENERAL NOTE: For additional requirements refer to para. 2. NOTE: (1) Where specifying nominal size in decimals, zeros preceding decimal and in the fourth decimal place shall be omitted.
59
COPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling ServicesCOPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling Services
STD-ASME B18.6-3-ENGL L998 W 0759670 Ob14232 30T W
ASME 818.6.3-1998
This type of recess has a large center opening, wide straight wings, and blunt bottom, with all edges relieved or rounded.
MACHINE SCREWS AND MACHINE SCREW NUTS
Not to exceed maximum major diameter of thread
Optional Shoulder for Long Screws With Reduced Body
TABLE 12C DIMENSIONS OF TYPE IA CROSS RECESSED TRUSS HEAD MACHINE SCREWS
Nominal Size
Diameter
Head Head Recess Recess Height Diameter Depth
A H M T
Recess Width N.
Recess Penetration or Basic Screw Diameter
Driver Gaging Depth
[Note (111 Max. Min. Max. Min. Max. Min. Max. Min. Min. Size Max. Min.
O 0.0600 1 0.0730 2 0.0860 3 0.0990
4 0.1120 5 0.1250 6 0.1380
8 0.1640 10 0.1900 12 0.2160
1/4 0.2500 Vl6 0.3125 "/8 0.3750 '/I6 0.4375
'/2 0.5000
'/a 0.6250 7 4 0.7500
9 / 1 6 0.5625
0.131 0.119 0.037 0.029 0.062 0.049 0.037 0.021 0.164 0.149 0.045 0.037 0.070 0.057 0.045 0.029 0.194 0.180 0.053 0.044 0.098 0.085 0.059 0.043 0.226 0.211 0.061 0.051 0.105 0.092 0.066 0.050
0.257 0.241 0.069 0.059 0.108 0.095 0.069 0.053 0.289 0.272 0.078 0.066 0.124 0.1 11 0.085 0.069 0.321 0.303 0.086 0.074 0.148 0.135 0.080 0.062
0.384 0.364 0.102 0.088 0.162 0.149 0.094 0.076 0.448 0.425 0.118 0.103 0.178 0.165 0,110 0.092 0.511 0.487 0.134 0.118 0.234 0.221 0.122 0.104
0.573 0.546 0.150 0.133 0.248 0.235 0.136 0.118 0.698 0.666 0.183 0.162 0.333 0.320 0.187 0.169 0.823 0.787 0.215 0.191 0.364 0.351 0.219 0.201 0.948 0.907 0.248 0.221 0.394 0.381 0.249 0.231
1.073 1.028 0.280 0.250 0.422 0.409 0.278 0.260 1.198 1.149 0.312 0.279 0.432 0.409 0.283 0.265 1.323 1.269 0.345 0.309 0.536 0.513 0.304 0.283 1.573 1.51 1 0.410 0.368 0.593 0.570 0.362 0.341
0.0 18 0.018 0.029 0.029
0.029 0.030 0.041
0.041 0.042 0.055
0.056 0.086 0.086 0.086
0.086 0.086 0.097 0.098
O 0.030 0.014 O 0.038 0.022 1 0.049 0.033 1 0.056 0.040
1 0.059 0.043 1 0.075 0.059 2 0.065 0.047
2 0.079 0.061 2 0.095 0.077 3 0.101 0.083
3 0.1 15 0.097 4 0.161 0.143 4 0.192 0.174 4 0.223 0.205
4 0.251 0.233 4 0.256 0.238 5 0.266 0.245 5 0.323 0.302
GENERAL NOTE: For additional requirements refer to para. 2. NOTE: (1) Where specifying nominal size in decimals, zeros preceding decimal and in the fourth decimal place shall be omitted.
60
COPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling ServicesCOPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling Services
STD-ASIE B18-6.3-ENGL 177B W 0757670 Ob14233 24h m
MACHINE SCREWS AND MACHINE SCREW NUTS ASME 818.6.3-1998
1 k 0 . 0 6 2 min.
Not to exceed maximum major diameter of thread
I
This t w e of recess consists of two intersecting slots with parallel sides converging to a slightly truncated apex at bottom of recess.
Optional Shoulder for Long Screws With Reduced Body
TABLE 12D DIMENSIONS OF TYPE II CROSS RECESSED TRUSS HEAD MACHINE SCREWS
Nominal Size or Basic Screw
Diameter [Note (1 ) l Max. Min. Max. Min. Min. Max. Min. Max. Min. Min. [Note (211 Max. Min.
Head Head Head Recess Recess Height Radius Diameter Depth Driver Recess Penetration
A H M T R. N. Size Gaging Depth
O 0.0600 1 0.0730 2 0.0860 3 0.0990
4 0.1120 5 0.1250 6 0.1380
8 0.1640 10 0.1900 12 0.2160
'14 0.2500 '/le 0.3125 "/8 0.3750
'116 0.4375
'12 0.5000 '116 0.5625 '18 0.6250 '14 0.7500
0.131 0.119 0.037 0.029 0.164 0.149 0.045 0.037 0.194 0.180 0.053 0.044 0.226 0.211 0.061 0.051
0.257 0.241 0.069 0.059 0.289 0.272 0.078 0.066 0.321 0.303 0.086 0.074
0.384 0.364 0.102 0.088 0.448 0.425 0.118 0.103 0.511 0.487 0.134 0.118
0.573 0.546 0.150 0.133 0.698 0.666 0.183 0.162 0.823 0.787 0.215 0.191 0.948 0.907 0.248 0.221
1.073 1.028 0.280 0.250 1.198 1.149 0.312 0.279 1.323 1.269 0.345 0.309 1.573 1.511 0.410 0.368
0.087 0.073 0.067 0.036 0.027 0.107 0.091 0.083 0.047 0.037 0.129 0.109 0.101 0.059 0.049 0.151 0.127 0.118 0.071 0.060
0.169 0.144 0.135 0.080 0.069 0.191 0.162 0.152 0.092 0.080 0.211 0.180 0.170 0.103 0.091
0.254 0.215 0.204 0.121 0.109 0.283 0.251 0.238 0.145 0.131 0.336 0.286 0.273 0.167 0.154
0.375 0.321 0.306 0.182 0.167 0.457 0.391 0.373 0.228 0.211 0.538 0.456 0.436 0.270 0.252 0.619 0.523 0.500 0.314 0.294
0.701 0.601 0.576 0.365 0.343 0.783 0.601 0.576 0.365 0.343 0.863 0.601 0.576 0.365 0.343 1.024 0.601 0.576 0.365 0.343
0.021 0.023 0.026 0.028
0.031 0.033 0.035
0.041 0.046 0.051
0.057 0.067 0.076 0.086
0.097 0.097 0.097 0.097
. . . Note (3)
. . . Note (3)
. . . 0.033
. . . 0.045
. . . 0.056
. . . 0.068
. . . 0.079
. . . 0.102
. . . O. 126
. . . O. 148
. . . 0.171
. . . 0.217
. . . 0.259
. . . 0.303
. . . 0.354
. . . 0.354
. . . 0.354
. . . 0.354
Note (3) Note (3)
0.024 0.035
0.046 0.057 0.068
0.091 0.113 O. 136
0.157 0.201 0.242 0.284
0.333 0.333 0.333 0.333
GENERAL NOTE: For additional requirements refer to para. 2. NOTES: (1) Where specifying nominal size in decimals, zeros preceding decimal and in the fourth decimal place shall be omitted. (2) Point same on all drivers. (3) Not practical to gage.
61
COPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling ServicesCOPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling Services
STDmASME BLB.b-3-ENGL 1978
ASME 818.6.3-1998
m 0759670 0'614234 L82 m
MACHINE SCREWS AND MACHINE SCREW NUTS
TABLE 13A DIMENSIONS OF SLOTTED BINDING HEAD MACHINE SCREWS
Undercut Undercut
Nominal Size
Diameter
Head Total Head Head Oval Diameter Depth
or Basic Screw Diameter Height Height Slot Width Slot Depth U X A O F J T [Note (211 [Note (211
[Note (311 Max. Min. Max. Min. Max. Min. Max. Min. Max. Min. Max. Min. Max. Min.
O000 0.02 1 o O00 0.0340 O0 0.0470
O 0.0600 1 0.0730 2 0.0860 3 0.0990
4 0.1120 5 0.1250 6 0.1380
8 0.1640 10 0.1900 12 0.2160
'/! 0.2500 5/16 0.3125 '/a 0.3750
0.046 0.040 0.014 0.009 0.006 0.003 0.008 0.004 0.009 0.005 . . . 0.073 0.067 0.021 0.015 0.008 0.005 0.012 0.006 0.013 0.009 . . . 0.098 0.090 0.028 0.023 0.011 0.007 0.017 0.010 0.018 0.012 . . .
. . . . . . . . .
. . . . . . . . .
. . . . . . . . .
0.126 0.119 0.032 0.026 0.012 0.008 0.023 0.016 0.018 0.009 0.098 0.086 0.007 0.002 0.153 0.145 0.041 0.035 0.015 0.011 0.026 0.019 0.024 0.014 0.120 0.105 0.008 0.003 0.181 0.171 0.050 0.043 0.018 0.013 0.031 0.023 0.030 0.020 0.141 0.124 0.010 0.005 0.208 0.197 0.059 0.052 0.022 0.016 0.035 0.027 0.036 0.025 0.162 0.143 0.011 0.006
0.235 0.223 0.068 0.061 0.025 0.018 0.039 0.031 0.042 0.030 0.184 0.161 0.012 0.007 0.263 0.249 0.078 0.069 0.029 0.021 0.043 0.035 0.048 0.035 0.205 0.180 0.014 0.009 0.290 0.275 0.087 0.078 0.032 0.024 0.048 0.039 0.053 0.040 0.226 0.199 0.015 0.010
0.344 0.326 0.105 0.095 0.039 0.029 0.054 0.045 0.065 0.050 0.269 0.236 0.017 0.012 0.399 0.378 0.123 0.112 0.045 0.034 0.060 0.050 0.077 0.060 0.312 0.274 0.020 0.015 0.454 0.430 0.141 0.130 0.052 0.039 0.067 0.056 0.089 0.070 0.354 0.311 0.023 0.018
0.525 0.498 0.165 0.152 0.061 0.046 0.075 0.064 0.105 0.084 0.410 0.360 0.026 0.021 0.656 0.622 0.209 0.194 0.077 0.059 0.084 0.072 0.134 0.108 0.513 0.450 0.032 0.027 0.788 0.746 0.253 0.235 0.094 0.071 0.094 0.081 0.163 0.132 0.615 0.540 O 039 0.034
GENERAL NOTE: For additional requirements refer to para. 2. NOTES: (1) Break sharp edge on head where spherical and conical surfaces meet. (2) Unless otherwise specified by purchaser, slotted binding head machine screws shall not be undercut. (3) Where specifying nominal size in decimals, zeros preceding decimal and in the fourth decimal place shall be omitted.
62
COPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling ServicesCOPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling Services
MACHINE SCREWS AND MACHINE SCREW NUTS ASME 818.6.3-1998
This type of recess has a large center opening, tapered wings, and blunt bottom, with all edges relieved or rounded.
TABLE 13B DIMENSIONS OF TYPE I CROSS RECESSED BINDING HEAD MACHINE SCREWS
Recess
Nominal Size or Basic Screw
Diameter
Head Total Head Head Oval Recess Recess Depth Width
Penetration Gaging
N, Driver Depth
Height Height Diameter A O F M T
[Note (211 Max. Min. Max. Min. Max. Min. Max. Min. Max. Min. Min. Size Max. Min.
O 0.0600 1 0.0730 2 0.0860 3 0.0990
4 0.1120 5 0.1250 6 0.1380
8 0.1640 10 0.1900 12 0.2160
'/4 0.2500 '/,e 0.3125
3 / ~ 0.3750
0.126 0.119 0.153 0.145 0.181 0.171 0.208 0.197
0.235 0.223 0.263 0.249 0.290 0.275
0.344 0.326 0.399 0.378 0.454 0.430
0.525 0.498 0.656 0.622 0.788 0.746
0.032 0.041 0.050 0.059
0.068 0.078 0.087
0.105 O. 123 0.141
0.165 0.209 0.253
0.026 0.035 0.043 0.052
0.061 0.069 0.078
0.095 0.112 O. 130
0.152 0.194 0.235
0.012 0.015 0.018 0.022
0.025 0.029 0.032
0.039 0.045 0.052
0.061 0.077 0.094
0.008 0.01 1 0.01 3 0.016
0.018 0.021 0.024
0.029 0.034 0.039
0.046 0.059 0.071
0.067 0.074 0.100 0.110
0.118 0.148 0.160
0.186 0.205 0.267
0.281 0.350 0.400
0.054 0.061 0.087 0.097
0.105 0.135 0.147
0.173 0.192 0.254
0.268 0.337 0.387
0.040 0.047 0.058 0.068
0.077 0.075 0.088
0.114 0.134 0.151
0.164 0.195 0.247
0.023 0.030 0.041 0.051
0.059 0.051 0.064
0.090 0.109 0.126
0.140 0.172 0.223
0.013 0.014 0.017 0.017
0.017 0.025 0.026
0.028 0.029 0.032
0.046 0.068 0.076
O O 1 1
1 2 2
2 2 3
3 4 4
0.033 0.016 0.040 0.023 0.051 0.034 0.061 0.044
0.070 0.052 0.064 0.040 0.077 0.053
O. 103 0.079 0.123 0.098 0.134 0.109
0.147 0.123 0.175 0.152 0.227 0.203
GENERAL NOTE: For additional requirements refer to para. 2. NOTES: (1) Break sharp edge on head where spherical and conical surfaces meet. (2) Where specifying nominal size in decimals, zeros preceding decimal and in the fourth decimal place shall be omitted
63
COPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling ServicesCOPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling Services
STDmASME BZ8*6=3-ENGL 1998 m 0759670 ObL423b T55
ASME 618.6.3-1998 MACHINE SCREWS AND MACHINE SCREW NUTS
5" c 3" A" Note (l'
This type of recess has a large center opening, wide straight wings, and blunt bottom, with all edges relieved or rounded.
TABLE 13C DIMENSIONS OF TYPE IA CROSS RECESSED BINDING HEAD MACHINE SCREWS
Recess Penetration
Gaging Depth
Nominal Size
Diameter [Note (211 Max. Min. Max. Min. Max. Min. Max. Min. Max. Min. Min. Size Max. Min.
Head Total Head Head Oval Recess Recess Depth Width or Basic Screw Diameter Height Height Diameter
A O F M T N, Driver
O 0.0600 1 0.0730 2 0.0860 3 0.0990
4 0.1120 5 0.1250 6 0.1380
8 0.1640 10 0.1900 12 0.2160
'/d 0.2500 0.3125
'//B 0.3750
0.126 0.119 0.032 0.026 0.012 0.008 0.067 0.054 0.042 0.026 0.018 O 0.034 0.018 0.153 0.145 0.041 0.035 0.015 0.011 0.074 0.061 0.049 0.033 0.018 O 0.043 0.027 0.181 0.171 0.050 0.043 0.018 0.013 0.104 0.091 0.065 0.049 0.029 1 0.054 0.038 0.208 0.197 0.059 0.052 0.022 0.016 0.109 0.096 0.070 0.054 0.029 1 0.059 0.043
0.235 0.223 0.068 0.061 0.025 0.018 0.117 0.104 0.078 0.062 0.029 1 0.068 0.052 0.263 0.249 0.078 0.069 0.029 0.021 0.144 0.131 0.075 0.057 0.040 2 0.059 0.041 0.290 0.275 0.087 0.078 0.032 0.024 0.156 0.143 0.087 0.069 0.040 2 0.072 0.054
0.344 0.326 0.105 0.095 0.039 0.029 0.181 0.168 0.113 0.095 0.041 2 0.097 0.079 0.399 0.378 0.123 0.112 0.045 0.034 0.199 0.186 0.131 0.113 0.041 2 0.115 0.097 0.454 0.430 0.141 0.130 0.052 0.039 0.260 0.247 0.147 0.129 0.056 3 0.125 0.107
0.525 0.498 0.165 0.152 0.061 0.046 0.274 0.261 0.161 0.143 0.057 3 0.139 0.121 0.656 0.622 0.209 0.194 0.077 0.059 0.339 0.326 0.190 0.172 0.086 4 0.163 0.145 0.788 0.746 0.253 0.235 0.094 0.071 0.387 0.374 0.240 0.222 0.086 4 0.213 0.195
GENERAL NOTE: For additional requirements refer to para. 2. NOTES: (1) Break sharp edge on head where spherical and conical surfaces meet. (2) Where specifying nominal size in decimals, zeros preceding decimal and in the fourth decimal place shall be omitted.
64
COPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling ServicesCOPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling Services
STD-ASME B L B - b - 3 - E N G L L778 m 0759b70 Ob14237 771 m
MACHINE SCREWS AND MACHINE SCREW NUTS
Note (1) 5" f 3" ~
This type of recess consists of two intersecting slots with parallel sides converging to a slightly truncated apex at bottom of recess.
ASME 818.6.3-1998
'J O
TABLE 130 DIMENSIONS OF TYPE II CROSS RECESSED BINDING HEAD MACHINE SCREWS
Nominal Size Head Total Head Head Oval Recess or Basic Screw Diameter Height Height Diameter Depth Width Driver Recess Penetration
Diameter Gaging Depth
[Note (211 Max. Min. Max. Min. Max. Min. Max. Min. Max. Min. Min. [Note (311 Max. Min.
Recess
A O F M T N. Size
O 0.0600 0.126 0.119 0.032 0.026 0.012 0.008 0.083 0.073 0.042 0.031 0.023 . . . Note (4) Note (4) 1 0.0730 0.153 0.145 0.041 0.035 0.015 0.011 0.097 0.087 0.051 0.040 0.025 . . . Note (4) Note (4) 2 0.0860 0.181 0.171 0.050 0.043 0.018 0.013 0.118 0.106 0.065 0.052 0.028 . . . 0.039 0.027 3 0.0990 0.208 0.197 0.059 0.052 0.022 0.016 0.136 0.124 0.077 0.064 0.031 . . . 0.051 0.039
4 0.1120 0.235 0.223 0.068 0.061 0.025 0.018 0.154 0.141 0.086 0.073 0.034 . , . 0.062 0.050 5 0.1250 0.263 0.249 0.078 0.069 0.029 0.021 0.172 0.158 0.098 0.084 0.036 . . . 0.074 0.061 6 0.1380 0.290 0.275 0.087 0.078 0.032 0.024 0.190 0.176 0.110 0.096 0.039 . . . 0.086 0.073
8 0.1640 0.344 0.326 0.105 0.095 0.039 0.029 0.224 0.209 0.126 0.112 0.044 . . . O. 108 0.094 10 0.1900 0.399 0.378 0.123 0.112 0.045 0.034 0.247 0.231 0.141 0.127 0.047 . . . 0.123 0.109 12 0.2160 0.454 0.430 0.141 0.130 0.052 0.039 0.293 0.275 0.171 0.155 0.054 . . , 0.153 0.137
'14 0.2500 0.525 0.498 0.165 0.152 0.061 0.046 0.329 0.311 0.187 0.171 0.059 . , . 0.176 0.160 5/16 0.3125 0.656 0.622 0.209 0.194 0.077 0.059 0.414 0.393 0.243 0.224 0.072 . . . 0.232 0.214
0.3750 0.788 0.746 0.253 0.235 0.094 0.071 0.480 0.456 0.286 0.265 0.081 , . . 0.275 0.255
GENERAL NOTE: For additional requirements refer to para. 2. NOTES: (I) Break sharp edge on head where spherical and conical surfaces meet. (2) Where specifying nominal size in decimals, zeros preceding decimal and in the fourth decimal place shall be omitted. (3) Point same on all drivers. (4) Not practical to gage.
65
COPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling ServicesCOPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling Services
Shap
e of
in
dent
atio
n oo
tiona
l -
Slot
s m
ay
be
at
rand
om
to
hex
flats
[s
ee
Note
(1
11
Inde
nted
He
ad
Gag
ing
ring
7 t--
--W
I
Trim
med
He
ad
or
Fully
Up
set
Head
TABL
E 14
IL
LUST
RAT
ION
COPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling ServicesCOPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling Services
TABL
E 14
D
IMEN
SIO
NS
OF
PLAI
N
AND
SLO
TTED
R
EGU
LAR
AN
D LA
RG
E H
EX
HEA
D
MAC
HIN
E SC
REW
S
Larg
e He
ad
[Not
es
(4).
1711
No
min
al
Size
or
Basic
Scre
w Di
amete
r
[Note
(31
1
Regu
lar
Head
[Not
e (4
)l
Widt
h Ac
ross
Ac
ross
Fla
ts A
[Note
(51
1 Co
rners
W,
Min.
Max
. M
in.
[Note
s (5
). (61
1
Slot
Widt
h
[Not
: (I)
]
Slot
Depth
INote
skL
(811
Protr
usion
Beyo
nd
Gagin
g Ri
ng
F,
Min.
Head
Heigh
t H
Widt
h Ac
ross
Fla
ts A
Note
(511
Acro
ss
Corne
rs W
, M
in.
Max
. M
in.
(Not
es
(5J,
(6
11
Max
. M
in.
0.04
4 0.
036
0.05
0 0.
040
0.05
5 0.
044
Max
. M
in.
Max
. M
in.
[Note
(6
11
. .
0.02
2 .
. .
0.02
4 .
. .
. 0.
026
1 0.
0730
0.
125
0.12
0 0.
134
2 0.
0860
0.
125
0.12
0 0.
134
3 0.
0990
0.
188
0.18
1 0.
202
4 0.
1120
0.
188
0.18
1 0.
202
5 0.
1250
0.
188
0.18
1 0.
202
6 0.
1380
0.
250
0.24
4 0.
272
0.219
0.
213
0.23
8 0.
250
0.24
4 0.
272
. .
0.06
0 0.
049
0.039
0.
031
0.03
6 0.
025
0.02
9 0.
070
0.05
8 0.
043
0.03
5 0.
042
0.03
0 0.
035
0.09
3 0.
080
0.04
8 0.
039
0.04
6 0.
033
0.04
8
8 0.
1640
0.
250
0.24
4 0.
272
10
0.19
00
0.31
2 0.
305
0.34
0 12
0.
2160
0.
312
0.30
5 0.
340
0.31
2 0.
305
0.34
0 .
. .
0.37
5 0.
367
0.40
9
0.110
0.0
96
0.05
4 0.
045
0.06
6 0.
052
0.05
8 0.
120
0.10
5 0.
060
0.05
0 0.
072
0.05
7 0.
063
0.15
5 0.
139
0.06
7 0.
056
0.09
3 0.
077
0.08
3
‘/4
0.25
00
0.37
5 0.
367
0.409
?&
0.31
25
0.50
0 0.
489
0.54
5 %
0.
3750
0.
562
0.55
1 0.
614
0.43
8 0.
428
0.47
7 0.1
90
0.17
2 0.
075
0.06
4 0.
101
0.08
3 0.
103
0.23
0 0.
208
0.08
4 0.
072
0.12
2 0.
100
0.12
5 0.
295
0.27
0 0.
094
0.08
1 0.
156
0.13
1 0.
162
GEN
ERAL
NO
TES:
(a
) Fo
r ad
ditio
nal
requ
irem
ents
refe
r to
pa
ra.
2.
(b)
For
refe
renc
e,
see
Tabl
e 14
Illu
stra
tion
on
prev
ious
page
.
NOTE
S:
(1)
Unle
ss
othe
rwise
sp
ecifie
d by
pu
rcha
ser,
hex
head
m
achi
ne
scre
ws
are
not
slotte
d.
(2)
A sl
ight
ro
undin
g of
al
l ed
ges
and
corn
ers
of
the
hex
surfa
ces
of
inde
nted
he
x he
ads
shal
l be
pe
rmiss
ible
pr
ovide
d th
e dia
met
er
of
the
bear
ing
circ
le
is e
qual
to
no
le
ss
than
90
%
of
the
spec
ified
min
imum
wi
dth
acro
ss
flats
di
men
sion.
(3
) W
here
sp
ecify
ing
nom
inal
siz
e in
de
cimal
s,
zero
s pr
eced
ing
decim
al
and
in
the
four
th
decim
al
plac
e sh
all
be
omitt
ed.
(4)
Unle
ss
othe
rwise
sp
ecifie
d by
pu
rcha
ser,
regu
lar
hex
head
s sh
all
be
furn
ished
, an
d bo
th
regu
lar
and
larg
e he
ad
style
s m
ay
be
of
inde
nted
he
ad,
trim
med
he
ad,
or
fully
up
set
head
co
nstru
ctio
n,
at
the
optio
n of
m
anuf
actu
rer.
(5)
Dim
ensio
ns
acro
ss
flats
an
d ac
ross
co
rner
s of
th
e he
ad
shal
l be
m
easu
red
at
the
poin
t of
m
axim
um
met
al.
Tape
r of
si
des
of
hex
(ang
le be
twee
n on
e sid
e an
d th
e ax
is)
shal
l no
t ex
ceed
2”
or
0.
004
in.,
which
ever
is
gr
eate
r, th
e sp
ecifie
d wi
dth
acro
ss
flats
be
ing
the
larg
e di
men
sion.
(6
) Th
e ro
undin
g du
e to
la
ck
of
fill
on
all
six
corn
ers
of
the
head
sh
all
be
reas
onab
ly un
iform
an
d th
e wi
dth
acro
ss
corn
ers
of
the
head
sh
all
be
such
th
at
when
a
shar
p rin
g ha
ving
an
insid
e dia
met
er
equa
l to
th
e sp
ecifie
d m
inim
um
widt
h ac
ross
co
rner
s is
pl
aced
on
th
e to
p an
d bo
ttom
of
th
e he
ad,
the
head
sh
all
prot
rude
by
an
am
ount
eq
ual
to,
or
grea
ter
than
, th
e F
value
ta
bula
ted.
Se
e Ap
pend
ix II
for
acro
ss
corn
ers
gagi
ng
of
hex
head
s.
(7)
Larg
e he
x he
ad
is i
nten
ded
for
scre
w an
d wa
sher
as
sem
blie
s (s
ems)
as
sp
ecifie
d in
AS
ME
818.
13,
and
othe
r ap
plica
tions
re
quirin
g la
rge
bear
ing.
(8
) Sl
ot
dept
h be
yond
bo
ttom
of
in
dent
atio
n on
in
dent
ed
head
s sh
all
not
be
less
th
an
one-
third
of
th
e m
inim
um
slot
de
pth
spec
ified.
COPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling ServicesCOPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling Services
Gag
ing
ring
7 P-
WI
Slot
s m
ay
be
at
rand
om
to
hex
flats
[N
ote
(I)]
7 Sh
ape
of
inde
ntat
ion
optio
nal
[Not
e (2
)1-/
TABL
E 15
IL
LUST
RAT
ION
6 2 f m
COPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling ServicesCOPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling Services
2 2 m
:: it
TABL
E 15
D
IMEN
SIO
NS
OF
PLAI
N
AND
SLO
TTED
H
EX
WAS
HER
H
EAD
M
ACH
INE
SCR
EWS
s v)
Nom
inal
Size
or
Basic
Scre
w
Diam
eter
Widt
h
Acro
ss
Flats
A
[Not
e E4
1
Widt
h
Acro
ss
Corne
rs
W,
Min.
Head
W
ashe
r
Heigh
t Di
amete
r
H 8
Was
her
-. .
I m
ctmes
s *
* IJ
Slo
t W
idth
I
J r-s
I_
,3
wore
tiJ
1 -
Slo
t 5
Protr
usion
De
pth
Beyo
nd
z T
[Not
es (
I).
(711
Ga
ging
Ring
F,
Min.
4 5
[Not
e (4
11
Max
. M
in.
[Not
es
(51.
(6
)l M
ax.
Min.
M
ax.
Min.
M
ax.
Min.
M
ax.
Min.
M
ax.
Min.
[N
ote
WI
i%
2 0.
0860
0.
125
0.12
0 0.
134
0.05
0 0.
040
0.16
6 0.
154
0.01
6 0.
010
0.02
4 z
. 3
0.09
90
0.12
5 0.
120
0.13
4 0.
055
0.04
4 0.
177
0.16
3 0.
016
0.01
0 0.
026
z .
. .
s
4 0.
1120
0.
188
0.18
1 0.
202
0.06
0 0.
049
0.24
3 0.
225
0.019
0.
011
0.03
9 0.
031
0.04
2 0.
025
0.02
9 E
5 0.
1250
0.
188
0.18
1 0.
202
0.07
0 0.
058
0.26
0 0.
240
0.02
5 0.
015
0.04
3 0.
035
0.04
9 0.
030
0.03
5 2
6 0.
1380
0.
250
0.24
4 0.
272
0.09
3 0.
080
0.32
8 0.
302
0.02
5 0.
015
0.04
8 0.
039
0.05
3 0.
033
0.04
8
8 0.
1640
0.
250
0.24
4 0.
272
0.11
0 0.
096
0.34
8 0.
322
0.03
1 0.
019
0.05
4 0.
045
0.07
4 0.
052
0.05
8
10
0.19
00
0.31
2 0.
305
0.34
0 0.
120
0.10
5 0.
414
0.38
4 0.
031
0.01
9 0.
060
0.05
0 0.
080
0.05
7 0.
063
12
0.21
60
0.31
2 0.
305
0.34
0 0.
155
0.13
9 0.
432
0.39
8 0.
039
0.02
2 0.
067
0.05
6 0.
103
0.07
7 0.
083
‘A,
0.25
00
0.37
5 0.
367
0.40
9 0.
190
0.17
2 0.
520
0.48
0 0.
050
0.03
0 0.
075
0.06
4 0.1
11
0.08
3 0.
103
5/6
0.31
25
0.50
0 0.
489
0.54
5 0.
230
0.20
8 0.
676
0.62
4 0.
055
0.03
5 0.
084
0.07
2 0.
134
0.10
0 0.
125
“/8
0.37
50
0.56
2 0.
551
0.61
4 0.
295
0.27
0 0.
780
0.72
0 0.
063
0.03
7 0.
094
0.08
1 0.
168
0.13
1 0.
162
GEN
ERAL
NO
TES:
(a
) Fo
r ad
ditio
nal
requ
irem
ents
refe
r to
pa
ra.
2.
(b)
For
refe
renc
e,
see
Tabl
e 15
Illu
stra
tion
on
prev
ious
page
.
NOTE
S:
(1)
Unle
ss
othe
rwise
sp
ecifie
d by
pu
rcha
ser,
hex
wash
er
head
m
achi
ne
scre
ws
are
not
slotte
d.
(2)
Fille
t ra
dius
R
at
junc
tion
of
side
s of
he
x an
d to
p of
wa
sher
sh
all
not
exce
ed
0.15
tim
es
the
basi
c sc
rew
diam
eter
. (3
) A
slig
ht
roun
ding
of
all
edge
s an
d co
rner
s of
th
e he
x su
rface
s sh
all
be
perm
issib
le.
(4)
Whe
re
spec
ifyin
g no
min
al
size
in
decim
als,
ze
ros
prec
edin
g de
cimal
an
d in
th
e fo
urth
de
cimal
pl
ace
shal
l be
om
itted
. (5
) Di
men
sions
ac
ross
fla
ts
and
acro
ss
corn
ers
of
the
head
sh
all
be
mea
sure
d at
th
e po
int
of
max
imum
m
etal
. Ta
per
of
side
s of
he
x (a
ngle
betw
een
one
side
and
the
axis)
sh
all
not
exce
ed
2”
or
0.00
4 in
., wh
ichev
er
is g
reat
er,
the
spec
ified
widt
h ac
ross
fla
ts
bein
g th
e la
rge
dim
ensio
n.
(6)
The
roun
ding
due
to
lack
of
fil
l on
al
l six
co
rner
s of
th
e he
ad
shal
l be
re
ason
ably
unifo
rm
and
the
widt
h ac
ross
co
rner
s of
th
e he
ad
shal
l be
su
ch
that
wh
en
a sh
arp
ring
havin
g an
in
side
diam
eter
eq
ual
to
the
spec
ified
min
imum
wi
dth
acro
ss
corn
ers
is p
lace
d on
th
e to
p of
th
e he
ad,
the
hex
porti
on
of
the
head
sh
all
prot
rude
by
an
am
ount
eq
ual
to,
or
grea
ter
than
, th
e Fv
alue
tabu
late
d.
See
Appe
ndix
II fo
r ac
ross
co
rner
s ga
ging
of
he
x he
ads.
(7
) Sl
ot
dept
h be
yond
bo
ttom
of
in
dent
atio
n sh
all
not
be
less
th
an
one-
third
of
th
e m
inim
um
slot
de
pth
spec
ified.
COPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling ServicesCOPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling Services
STDmASHE BLB-6.3-ENGL 1998 0759b70 Ob14242 259
ASME 818.6.3-1998 MACHINE SCREWS AND MACHINE SCREW NUTS
"7
A Note (1)
/ 30" \ -Optional [Note (3)1
TABLE 16 DIMENSIONS OF SQUARE AND HEX MACHINE SCREW NUTS
Nominal Size or Basic Thread
Diameter
Width Across Width Across Corners Thickness Flats F Square G Hex G1 H
[Note 1411 Basic Max. Min. Max. Min. Max. Min. Max. Min.
O 0.0600 732 O. 156 0.1 50 0.221 0.206 0.180 0.171 0.050 0.043 1 0.0730 5/32 O. 156 0.150 0.221 0.206 0.180 0.171 0.050 0.043 2 0.0860 'i1 6 O. 188 0.180 0.265 0.247 0.217 0.205 0.066 0.057 3 0.0990 'i1 6 O. 188 0.180 0.265 0.247 0.217 0.205 0.066 0.057
4 0.1120 l h 0.250 0.241 0.354 0.331 0.289 0.275 0.098 0.087 5 0.1250 y1 6 0.312 0.302 0.442 0.415 0.361 0.344 0.114 0.102 6 0.1380 5
11 6 0.312 0.302 0.442 0.415 0.361 0.344 0.114 0.102
8 0.1640 11 132 0.344 0.332 0.486 0.456 0.397 0.378 O. 130 0.117
10 0.1900 "8 0.375 0.362 0.530 0.497 0.433 0.413 O. 130 0.117 12 0.2160 '4 6 0.438 0.423 0.619 0.581 0.505 0.482 0.161 0.148
'/* 0.2500 '11 6 0.438 0.423 0.619 0.581 0.505 0.482 0.193 O. 178 '/,6 0.3125 6 0.562 0.545 0.795 0.748 0.650 0.621 0.225 0.208
'/a 0.3750 "/B 0.625 0.607 0.884 0.833 0.722 0.692 0.257 0.239
GENERAL NOTE: For additional requirements refer to para. 2. NOTES: . ".
Square machine screw nuts shall have tops and bottoms flat, without chamfer. The bearing surface shall be perpendicular to the axis of the threaded hole pitch cylinder within a tolerance of 4 deg. Hexagon machine screw nuts shall have tops flat with chamfered corners. Diameter of top circle shall be equal to the maximum width across flats within a tolerance of minus 15%. The bearing surface shall be perpendicular to the axis of the threaded hole pitch cylinder within a tolerance of 4 deg. Bottoms of hexagon machine screw nuts are normally flat, but for special purposes may be chamfered, if so specified by purchaser. Where specifying nominal size in decimals, zeros preceding decimal and in the fourth decimal place shall be omitted.
70
COPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling ServicesCOPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling Services
STD-ASME BLB-b-3-ENGL L998 M 0759b70 Ob14243 L95 m
MACHINE SCREWS AND MACHINE SCREW NUTS
\ 40' I I '
TABLE 17 DIMENSIONS OF HEADER POINTS FOR MACHINE SCREWS BEFORE THREADING
Nominal Nominal Size 'Oint Screw Length
or Basic Screw Threads Diameter L. Diameter Per [Note (211 Inch Max. Min. [Note (311
P Max.
2 0.0860
4 0.1120
5 0.1250
6 0.1380
8 0.1640
10 0.1900
12 0.2160
'/4 0.2500
5/16 0.3125
'/a 0.3750
'/le 0.4375
'/* 0.5000
56 64
40 48
40 44
32 40
32 36
24 32
24 28
20 28
18 24
16 24
14 20
13 20
0.057 0.050 0.060 0.053
0.074 0.065 0.079 0.070
0.086 0.076 0.088 0.079
0.090 0.080 0.098 0.087
0.114 0.102 0.118 0.106
0.125 0.112 0.138 0.124
0.149 0.134 0.156 0.141
0.170 0.153 0.187 0.169
0.221 0.200 0.237 0.215
0.270 0.244 0.295 0.267
0.316 0.287 0.342 0.310
0.367 0.333 0.399 0.362
ASME 818.6.3-1998
GENERAL NOTE: For additional requirements refer t o para. 2. NOTES: (1) Edges of point may be rounded and end of point need
not be flat nor perpendicular to axis of shank. (2) Where specifying nominal size in decimals, zeros
preceding decimal and in the fourth decimal place shall be omitted.
(3) Header points apply to these nominal lengths or shorter. The pointing of longer lengths may require machining to the dimensions specified.
71
COPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling ServicesCOPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling Services
ASME 818.6.3-1998
MANDATORY APPENDIX I PROTRUSION GAGING OF FLAT COUNTERSUNK HEADS
Suitability of flat countersunk head screws, except the No. 0000, No. 000, and No. 00 sizes, and undercut flat countersunk head screws, except the No. 0 and No. 1 sizes, for application in countersinks designed to the principal dimensions of the screws may be determined by the use of a protrusion gage as illustrated i n Fig. I I .
Head angle
rF
thickness optlonal
t I l
FIG. Il PROTUSION GAGE
The gaging dimensions and the gage diameters are specified in the dimensional tables for flat countersunk head and undercut tlat countersunk head screws. The protrusion limits shown in the tables shall apply only when the gaging diameter is exactly as indicated with the gaging edge o f a sharpness obtained by lapping the hole and the top surface of the gage. Any variation in the gaging diameter will require recalculation o f protrusion values by the original formulas given below:
Maximum
M a x . F = Max. sharp head diameter - gage hole diameter
2
x ta11 YO" - i 2 i Min . head angle
Minimum protrusion:', '
Min. F = Min. sharp head diameter - gage hole diatnter
2
i x tan 90" - Max. head angle 2
or correction of protrusion in accordance with the following formula:
F = F - A - C' A - G
where F = F = A =
G = G' =
tabulated protrusion value corrected protrusion value head diameter (manimum or minimum for maximum or minimum protrusion, respec- tively) tabulated gage diameter measured gage diameter
To insure adequate service life, the protrusion gage should be made of tool steel having a hardness of not less than 60 Rockwell C (60 HRC).
' Protrusion values shown in dimensional tables were calculated from these formulas and rounded to the nearest 0.001 in., upward for the maximum and downward for the minimum.
' See formulas for maximum and minimum sharp head diameters in Appendix V.
73 Previous page
is blank COPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling ServicesCOPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling Services
ASME 818.6.3-1998
MANDATORY APPENDIX II ACROSS-CORNERS GAGING OF HEX HEADS
Suitability of across-corners dimensions of hex head and hex washer head screws may be determined by the use of gaging rings as described below.
When the gaging ring is placed on the top of a hex or hex washer head screw. and also the bottom of a hex head screw, at right angles to the axis of the screw, the head (hex portion of washer head) must protrude beyond the ring by an amount equal to 60% of the minimum head height H . For convenience, the minimum protrusion values are given i n the dimensional tables for hex and hex washer head screws.
The gaging ring shall have an inside diameter equal to the tabulated minimum width across corners, within a tolerance of plus 0.0003 in . The gaging edges of the ring shall be sharp and opposite faces shall be parallel. To insure adequate service life. the ring should be made of tool steel and have a hardness of not less than 60 Rockwell C.
A typical gaging fixture is shown i n Fig. I I I with an explanation of its application; however. any equivalent means may bc used.
To check hex head screws from the top, an initial reading shall be taken with the gaging ring placed on the indexing plate. Then, with the screw placed in the tixture, the gaging ring shall be placed on top of the screw head and a second reading taken. The difference between the two readings is equal to the protrusion F of the head beyond the gaging ring.
To check hex washer head screws, the gaging proce- dure shall be exactly the same as that for checking hex head screws from the top. However, in this case the difference X between the two readings includes the washer thickness and it is necessary to deduct the actual (measured) thickness of the washer portion from the difference X to obtain the protrusion F of the hex beyond the gaging ring.
Gaging the bottom of the head on hex head screws may be accomplished in the same manner as gaging the top, except the ring is placed below the head. The same protrusion values shall apply.
y Special micrometer body
F;- Must be parallel
ickness ptional
L Diameter 4 optional
Gaging Ring
Indexing plate with slots for screws
Gaging Hex Head From Top
Gaging Hex Washer Head
FIG. 111 TYPICAL GAGING FIXTURE
15 Previous page
is blank COPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling ServicesCOPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling Services
ASME 818.6.3-1998
MANDATORY APPENDIX 111 PENETRATION GAGING OF RECESSED HEADS
Penetration gaging is a test to determine the suitability o f recesses i n the heads of screws and may be used to indicate deficiencies in the dimensions of the recesses specified i n the dimensional tables. Penetrations that are too deep indicate the possibility of a thin section between head and shank of screw, a weakness that might result in twisting-off screw heads during tightening of the screws. Use of screws having shallow penetrations might result i n production problems such as reaming of recesses or excessive wear on driver bits.
Penetration gaging depth values for the various styles of recessed heads are included in the dimcnsional tables for the respective heads. These values were predicated originally on the gaging of plain tinish (unplated or uncoated) screws. However, subsequent experience has shown that the Type I and Type I I recess penetration limits as tabulated, and the Type IA recess penetration depths with tabulated minimum limit reduced by up to 0.005 in., are suitable for the gaging of screws having coating thickness of up to and including 0.0003 in. on signiticant surfaces.
Screws having heavier coatings, which fail to meet the penetration gaging requirements, must be stripped of finish and gaged for acceptance or rejection in the plain condition.
Specified in Tables 1111, 1112, and III3 are dimensions of gage points to be used for penetration gaging the Type I, Type IA, and Type I1 recesses. Gage points approach as nearly as possible the perfect driver form. Also specified are gage heads and bushings, which adapt the gage points to standard dial gages.
Penetration is gaged relative to a reference plane defined by the intersection of the edge of the recess wings with the top surface of the screw head. This plane is the same as the top surface of a flat head screw, but is somewhat below the topmost portion of heads that have rounded top surfaces. Knife edges or tapered ridges on the gage head are used to establish the reference plane. A reverse reading dial gage is used to indicate the penetration of the gage point into the recess. The gage may be zeroed on any flat surface.
77 Previous page
is blank COPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling ServicesCOPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling Services
Stan
dard
di
al
gage
ex
cept
nu
mer
als
read
ing
coun
ter-
i--
0.87
59
+=I
fO.8
751
/--
I= -
1
0.54
6
-Set
sc
rew
Gage
he
ad
(in
sect
ion)
Gage
po
int
Scre
w -
Bush
ing
for
No.
5 Ga
ge
Head
r--l
.0.2
50
0.24
5
JX
LD
Sect
ion
X-X
Tole
ranc
e tO
.005
un
less
ot
herw
ise
spec
ified
Gage
He
ad
Dim
ensio
ns
of
Gage
He
ads
Size
of
A,
Rece
ss
Gage
TO
.002
No.
0 0.
008
No.
1 0.
012
No.
2 0.
018
No.
3 0.
022
No.
4 0.
031
No.
5 0.
041
B,
C,
Q
E F,
G
kO.00
3 *0
.000
2 *O
.OOl
*0
.005
AO
.005
kO
.005
0.01
5 0.
0460
0.
377
0.56
2 1.
688
1.12
6 0.
020
0.08
80
0.37
7 0.
562
1.68
8 1.
126
0.03
1 0.
1420
0.
377
0.56
2 1.
688
1.12
6 0.
037
0.21
00
0.37
7 0.
562
1.68
8 1.
126
0.06
2 0.
3130
0.
377
0.56
2 1.
688
1.12
6 0.
094
0.50
10
0.55
0 0.
750
1.89
6 1.
134
Gage
Po
int
in
Zero
Ga
ge
Poin
t in
G
aging
Po
sitio
n Po
sitio
n
Pene
tratio
n Ga
ge
TABL
E 11
11 I
LLU
STR
ATIO
N
COPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling ServicesCOPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling Services
L G
rind
squa
re
with
ax
is
Gage
Po
int
All
othe
r siz
es
Half
Sect
ion
Y-Y
Enlar
ged
Point
De
tail
TABL
E 11
11 D
IMEN
SIO
NS
OF
GAG
E PO
INTS
Point
Po
int
Widt
h W
ing
Millin
g
Widt
h An
gle
Size
of
Point
B.
Le
ngth
Leng
th Th
ickne
ss F
G.
H.
Flat
on
End
Rece
ss
Dia.
A,
+a.o
ooo
c,
0.
Dia.
E,
+0.00
10
0”
+oo
J
Gage
*0
.000
2 -0
.001
0 ~0
.005
kO
.005
iO.0
05
Max
. M
in.
-0.00
00
00
-15’
Max
. M
in.
No.
0 0.
0450
0.
0240
0.
656
0.78
1 0.
094
0.01
2 0.
010
0.03
20
7"
00'
0.01
5 0.
010
No.
1 0.
0870
0.
0394
0.
688
0.81
2 0.
156
0.02
0 0.
018
0.05
00
7"
00
0.02
0 0.
015
No.
2 0.
1410
0.
0606
0.
750
0.87
5 0.
219
0.02
5 0.
023
0.09
00
5O 4
5 0.
020
0.01
5 No
. 3
0.20
90
0.09
83
0.78
1 0.
906
0.25
0 0.
031
0.02
9 0.
1500
5"
45
' 0.
020
0.01
5 No
. 4
0.31
20
0.14
07
0.84
4 0.
969
0.35
9 0.
044
0.04
2 0.
2000
7"
00
0.
020
0.01
5 No
. 5
0.50
00
0.23
10
1.03
1 1.
156
0.53
1 0.
063
0.06
1 0.
3110
7O
00
0.02
5 0.
020
GEN
ERAL
NO
TE:
For
addi
tiona
l re
fere
nce,
se
e Ta
ble
Ill1
Illust
ratio
n on
pr
eviou
s pa
ge.
NOTE
S:
(1)
Base
of
flu
te
on
size
No.
0 ha
s 0.
0090
to
0.
0109
in
. ra
dius
. (2
) To
lera
nce
on
size
No.
0 is
pl
us
0.00
00
and
min
us
0.00
26
in.
Base
Flu
te Sid
e Flu
te
Angle
K,
An
gle
L,
0’ +1
5 00
+1
5’
00
-00
00
-00’
[Not
e (1
)I
92”
00’
138'
00
92"
00
140"
00
' 92
" 00
14
6“
00
92"
00'
153"
00
' 92
" 00
' 16
2"
46
92"
00
Flute
Widt
h at
Botto
m
M,
+o.oo
oo
-0.00
10
0.01
51
[Not
e (2
)1
0.02
02
0.04
34
0.08
26
0.10
78
0.17
30
COPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling ServicesCOPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling Services
Size
of
Rece
ss
Gage
Stan
dard
di
al
gage
ex
cept
nu
mer
als
read
ing
coun
ter-
kO.8
751
/-----
F
-1
-Set
sc
rew
Gage
he
ad
(in
sect
ion)
Gage
po
int
Scre
w -
Bush
ing
for
No.
5 Ga
ge
Head
To
lera
nce
+0.0
05
unle
ss
othe
rwise
sp
ecifie
d.
Gage
He
ad
Dim
ensio
ns
of
Gage
He
ads
Size
of
A,
B,
c,
D,
6
F,
G,
Rece
ss
Gage
io
.002
io
.003
*0
.000
2 *O
.OOl
zto
.005
*0
.005
*0
.005
No.
0 0.
008
0.01
5 0.
0460
0.
377
0.56
2 1.
688
1.12
6 No
. 1
0.01
2 0.
020
0.08
80
0.37
7 0.
562
1.68
8 1.
126
No.
2 0.
018
0.03
1 0.
1420
0.
377
0.56
2 1.
688
1.12
6 No
. 3
0.02
2 0.
037
0.21
00
0.37
7 0.
562
1.68
8 1.
126
No.
4 0.
031
0.06
2 0.
3130
0.
377
0.56
2 1.
688
1.12
6 No
. 5
0.04
1 0.
094
0.50
10
0.55
0 0.
750
1.89
6 1.
134
Gage
Po
int
in
Zero
Ga
ge
Poin
t in
G
aging
Po
sitio
n Po
sitio
n
Pene
tratio
n Ga
ge TA
BLE
1112
DIM
ENSI
ON
S O
F G
AGE
POIN
TS
Poin
t Di
amet
er
A.
io.o
oo2
Point
W
idth
B
(at
Base
of
Ra
dius
R)
Max
. M
in.
Leng
th c,
*0.0
05
Leng
th
0,
io.0
05
Diam
eter
f. f0
.005
No.
0 0.
0450
0.
0280
0.
0265
0.
656
0.78
1 0.0
94
No.
1 0.
0870
0.
0438
0.
0423
0.
688
0.81
2 0.
156
No.
2 0.
1410
0.
0670
0.
0655
0.
750
0.87
5 0.
219
No.
3 0.
2090
0.
1020
0.
1005
0.
781
0.90
6 0.
250
No.
4 0.
3120
0.
1520
0.
1505
0.
844
0.96
9 0.
359
No.
5 0.
5000
0.
2420
0.
2400
1.
031
1.15
6 0.
531
Win
g Th
ickne
ss
Point
W
idth
F.
G.
+0.00
10
+O.O
Ol
-0.O
OOQ
-0.00
0
0.01
65
0.03
5 0.
0265
0.
054
0.03
80
0.09
5 0.
0530
0.
155
0.08
10
0.20
3 0.
0910
0.
315
= (co
ntinu
ed)
-
COPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling ServicesCOPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling Services
LGrin
d sq
uare
wi
th
axis
\ Se
ctio
n
Gage
Po
int
Enlar
ged
Point
De
tail
TABL
E 11
12 D
IMEN
SIO
NS
OF
GAG
E PO
INTS
(C
ON
T’D
)
Rib
Wing
Millin
g M
illing
Form
Fo
rm
Flat
00
Millin
g O
ffset
O
ffset
An
gle
Angle
on
Size
Angle
An
gle
Angle
L
M.
Wing
W
ing
End
of
H,
J,
K 0”
+0
7 00
+07
O
ffset
O
ffset
p.
Ra
dius
Rece
ss
00
+oo
0”
+06’
00
+06
0”
-00
00
-00
Angle
An
gle
+0.0
05
R
Gage
Oq
-06
0’
-0
0 0’
-0
0 [N
ote
11)1
N
ote
(111
N
NT
-0
.000
M
ax.
Min.
No.
0 7”
00
’ 4”
23
’ 70
45’
46
” 00
’ 46
” 00
’ 22
’ 2”
00
’ 0.
010
0.00
4 0.
003
No.
1 7”
00
’ 4”
23
’ 7O
45
46”
00’
46”
00’
22’
20
00’
0.01
5 0.
005
0.00
4 No
. 2
5”
45
3”
00
6”
20’
46”
00’
46”
00’
17’
2”
04’
0.01
5 0.
008
0.00
6 No
. 3
5”
45
3”
00’
6”
20
56”
15’
46”
00’
17’
2”
04’
0.01
5 0.
012
0.00
8
No.
4 7O
00’
4”
23
’ 7”
45
56
” 15
’ 46
” 00
22
’ 2”
00
’ 0.
015
0.02
0 0.
014
No.
5 7”
00
4’
23
’ 7O
45
56’
15’
46”
00’
22’
2”
00
0.02
0 0.
040
0.03
5
NOTE
: (I)
Th
ese
dim
ensio
ns
are
mea
sure
d no
rmal
to
the
milli
ng
cut.
COPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling ServicesCOPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling Services
Bush
ing
-Sta
ndar
d di
al
gage
Bush
ing
num
eral
s re
ading
clo
ckwi
se
Gage
he
ad
(in
sect
ion)
Gage
po
int
in
zero
po
sitio
n
Pene
tratio
n Ga
ge
Gage
po
int
f-0.8
75-j
c 1.
875
-j
Cl
r’,/4
-20
UNC-
2B
JX
45”
b)‘
Tole
ranc
e +0
.005
un
less
Se
ctio
n X-
X
othe
rwise
sp
ecifie
d Ga
ge
Head
exce
pt
coun
ter-
Dim
ensio
ns
of
Gage
He
ads
A B
c D
E Ga
ge
. Di
amet
er
to.0
02
+0.0
02
~0.0
001
io.0
05
kO.00
5 -o
oo
o -0
.000
0.09
3 0.
09
30
0.34
4 0.
375
0.0
30
0.02
4 0.
141
0.14
10
0.
375
0.43
8 0.
046
0.03
6 0.
246
0.24
60
0.50
0 0.
500
0.06
2 0.
05
1 0.
436
0.43
60
0.68
8 0.
562
0.09
4 0.
078
TABL
E 11
13
ILLU
STR
ATIO
N
COPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling ServicesCOPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling Services
Gage
Po
int
Enla
rged
Po
int
Deta
il
Half
Sect
ion
Y-Y
.
TABL
E 11
13
DIM
ENSI
ON
S O
F G
AGE
POIN
TS
Gage
Di
amet
er
0.09
3 0.
141
0.24
6 0.
436
Poin
t
Dia.
A,
*0.0
001
0.09
26
0.14
06
0.24
56
0.43
56
Dia.
Le
ngth
Le
ngth
6.
C,
0,
*0.0
05
3zo.
005
*0.0
05
0.18
8 0.
750
0.87
5 0.
250
0.87
5 1 .
ooo
0.31
2 0.
938
1.06
2 0.
469
1.12
5 1.
250
Poin
t W
idth
E.
+O.O
Ol
-0.0
00
0.02
7 0.
027
0.02
7
0.02
7
Flat
Ra
dius
on
End
G.
E +o
.ooo
10
.002
-0
.001
0.06
2 0.
005
0.06
2 0.
005
0.06
2 0.
005
0.06
2 0.
005
Milli
ng
Angl
e H,
0”
+05’
0”
-0
0
8”
45’
8”
45
8”
45
8”
45’
Side
Fl
ute
Angl
e J.
0”
+15
00
-00
90”
00
90”
00
90”
00
90”
00’
GEN
ERAL
NO
TES:
(a
) Al
thou
gh
thes
e ga
ges
may
be
us
ed
inte
rcha
ngea
bly,
sh
owin
g id
entic
al
read
ings
on
th
ose
sizes
of
sc
rews
wh
ere
dim
ensio
n B
of
gage
he
ad
is g
reat
er
than
th
e re
cess
dia
met
er,
the
follo
wing
re
com
men
datio
ns
may
be
ap
plie
d:
use
0.09
3 ga
ge
for
rece
ss
diam
eter
s up
to
0.
150
in.
(it
is n
ot
prac
tical
to
ga
ge
scre
w siz
es
No.
0 an
d No
. 1
havin
g re
cess
di
amet
ers
of
less
th
an
0.10
2 in
. m
axim
um);
use
0.14
1 ga
ge
for
rece
ss
diam
eter
s of
0.
150
and
up
to
0.27
0 in
.; us
e 0.
246
gage
fo
r re
cess
di
amet
ers
of
0.27
0 an
d up
to
0.
460
in.;
and
use
0.43
6 ga
ge
for
rece
ss
diam
eter
s of
0.
460
and
up
to
0.70
0 in
. (b
) Fo
r ad
ditio
nal
refe
renc
e,
see
Tabl
e III
3 Illu
stra
tion
on
prev
ious
page
.
COPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling ServicesCOPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling Services
STD*ASME BLB.b.3-ENGL L998 W 0759b70 Ob14253 034 m
ASME 818.6.3-1998
MANDATORY APPENDIX IV WOBBLE GAGING OF RECESSED HEADS
Wobble gaging provides a means for determining thc compatibility of cross recesses in the heads of screws with companion screw drivers, and will indicate the point where deviations in the recess contours affect satisfactory driver engagement. Recesses that exhibit excessive wobble characteristics will result in poor screw driveability because of driver camout prior to attaining normal torque level, damage to recesses, and/ or accelerated driver wear.
The allowable total wobble gaging limits for the various types of recesses included herein were predi- cated originally on the gaging of plain finish (unplated or uncoated) screws. However, subsequent experience has shown these limits to be suitable for the gaging of screws having coating thickness up to and including 0.0003 i n . on significant surfaces. Screws having heavier coatings that fail to meet the wobble gaging require- ments must be stripped o f finish and gaged for accept- ance or rejection in the plain condition.
Wobble gaging fixtures, as illustrated in Table IVI, and appropriate cross recess master plug gages with handles and position indicators for the respective recess types are available through the screw suppliers. Dimen- sions of the points on master plug gages are, except for the body diameters tabulated herein, the same as those specified for the respective gage points in Appendix I I I .
The screw to be gaged shall be placed into the screw-holding chuck and oriented such that one set of recess wings is parallel to the upright back plate. The screw shall be so positioned and the chuck shall be tightened sufficiently to prevent any tilting of the screw in the chuck when taking wobble readings.
The position gage pointer and handle with the proper master plug gage for the recess size being checked shall be positioned in the slot of the degree scale on the top plate and the point of the plug gage inserted into the screw recess. I t is essential that registry between the cross lines of pointer and the recess wings be maintained. To correct any misalignment, the chuck position lock screw is loosened, the chuck is rotated until registry is obtained, and the chuck is raised or lowered unt i l the gage pointer is flush with the top of the degree scale. The chuck position lock screw is then tightened and the readings taken. The gage handle, with downward pressure applied, is moved from side to side unt i l resistance is encountered and the total reading between points of travel of the gage pointer is recorded. The allowable angular wobble limits shall not exceed the values tabulated in Tables IV2 and IV3. Cross lines on the gage pointer should be rechecked with plug gage wings to make certain cross lines and gage wings are registered on identical radials.
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is blank COPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling ServicesCOPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling Services
ASME 818.6.3-1998
Back plate 1 Plug gage handle and pointer %
Cross recess master Plug gage
Gage body diameter -
Cross recess screw mounted in chuck ”-
Chuck for holding
Screw \
Top plate with degree scale calibrated on basis of 4.250 in. radius
MANDATORY APPENDIX IV
y Cross lines on end of pointer
Chuck position lock screw
FIG. IV1 WOBBLE GAGING FIXTURE
86
COPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling ServicesCOPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling Services
STDmASME B18.6-3-ENGL L998 m 0759b70 Ob14255 907 m
MANDATORY APPENDIX IV
TABLE IV1 GAGE BODY DIAMETERS
ASME 818.6.3-1998
Size of Type I Recess Type IA Recess
Recess Ground Gage Ground Gage Pressed Gage
Gage Max. Min. Max. Min. Max. Min.
No. O 0.135 0.115 0.135 0.115 . . . . . . No. 1 0.198 0.178 0.198 0.178 0.275 0.255 No. 2 0.260 0.240 0.260 0.240 0.275 0.255 No. 3 0.323 0.303 0.323 0.303 0.370 0.350 No. 4 0.385 0.365 0.385 0.365 0.475 0.455 No. 5 0.760 0.740 0.760 0.740 . . . . . .
GENERAL NOTE: Diameters of Type II recess gages are same as penetration gage points in Appendix 111.
TABLE IV2 GAGING LIMITS FOR TYPE I AND TYPE IA RECESSES
Size of Recess Wobble, deg
Maximum Allowable Total
Gage Type I Type IA
No. O No. 1 15 12 No. 2 12 10 No. 3 10 8 No. 4 10 8 No. 5 10 8
. . . . . .
TABLE IV3 GAGING LIMITS FOR TYPE II RECESS
~~~
Recess Gage
Diameter Maximum Allowable Total Wobble, deg
0.093 12 0.141 10 0.246 8 0.436 6
87
COPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling ServicesCOPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling Services
STD-ASME BL8.6.3-ENGL L998 m 0759670 Ob14256 843 m
ASME 818.6.3-1998
MANDATORY APPENDIX V DIMENSIONS FOR NO. 0000, NO. 000, AND NO. O0 THREAD SIZES
The following dimensional data for the No. 0000, No. 000, und No. 00 thread sizes is provided in Table V I for convenient reference until such time as these thread sizes may be adequately documented in an appropriate standard relating specifically to screw threads.
and Threads Per Inch Series Major Diameter Pitch Diameter
Minor Dia-
[Note (111 Designation Class Allowance Max. Min. Max. Min. TOI. meter
0000-160 or NS 2 0.0000 0.0210 0.0195 0.0169 0.0158 0,0011 0.0128 0.0210-160
000-120 or NS 2 ~ . ~ o ~ ~ 0.0340 0.0325 0.0286 0.0272 0.0014 0.0232 0.0340-120
00-90 or NS 2 0 . ~ 0 0 0 0.0470 0.0450 0.0398 0.0382 0.0016 0.0326 0.0470-90
00-96 or NS 2 ~.~~~~ 0.0470 0.0450 0.0402 0.0386 0.0016 0.0334 0.0470-96
Internal Nominal Size and Threads Minor Diameter
Per Inch Series ~~ [Note (211 Pitch Diameter Diameter, Major
[Note (111 Designation Class Min. Max. Min. Max. TOI. Min.
0000-160 or NS 2 . . . 0.02 10-1 60
. . 0.0169 0.0181 0.0012 0.0210
000-120 or NS 2 . . . . . . 0.0286 0.0300 0.0014 0.0340 0.0340-120
00-90 or NS 2 . . . . . . 0.0398 0.0414 0.0016 0.0470 0.0470-90
00-96 or NS 2 . . . . . . 0.0402 0.0418 0.0016 0.0470 0.0470-96
NOTES: (1) Where specifying nominal size in decimals, zeros preceding decimal and in the fourth decimal place
shall be omitted. (2) The minor diameter limits for internal threads are not specified; they are determined by the amount
of thread engagement necessary to satisfy the strength requirements and tapping performance in the intended application.
89 Previous page
is blank COPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling ServicesCOPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling Services
STD.ASME B18-6-3-ENGL L998 m 0759b70 Ob14257 78T m
ASME 818.6.3-1998
NONMANDATORY APPENDIX A FORMULAS FOR DIMENSIONS
Formulas for the dimensions of head diameter, head height, and slot depth for various types of head crews are provided in Tables Al through A14.
Formulas for dimensions of square and hex nuts are provided in Table A15.
TABLE A I FLAT COUNTERSUNK HEAD SCREWS
Screw Size Head Diameter
O000 thru O0 No formulas; see tables
O thru 'I0
'4 6
Max. A (sharp) = 2.040 D - 0.003 ref. [Note (1)l Min. A (sharp) = 1.960 D - 0.013 ref. [Note (1)l Max. A (rounded or flat) = 1.920 D - 0.003 [Note (211 Min. A (rounded or flat) = 1.820 D - 0.013 [Note (2)l Gaging diameter G = 1.830 D - 0.033
Max. A (sharp) = 2.000 D - 0.063 ref. [Note (1)1 Min. A (sharp) = 1.920 D - 0.073 ref. [Note (1)l Max. A (rounded or flat) = 1.880 D - 0.063 [Note (211 Min. A (rounded or flat) = 1.800 D - 0.073 [Note (2)l Gaging diameter G = 1.790 D - 0.093
'I2 t h r u '4 Max. A (sharp) = 2.000 D - 0.125 ref. [Note (lb1 Min. A (sharp) = 1.920 D - 0.135 ref. [Note (1)l Max. A (rounded or flat) = 1.880 D - 0.125 [Note (2)l Min. A (rounded or flat) = 1.800 D - 0.135 [Note (2)l Gaging diameter G = 1.790 D - 0.155
Screw Size Head Height Slot Depth
O000 thru O0 No formulas; see tables No formulas; see tables
O thru 'I0 Max. H = 0.619 D - 0.002 Max. T = 0.288 D - 0.002 Min. H = 0.552 D - 0.007 ref. [Note (1)l Min. J = 0.192 D - 0.002
'4 6 Max. H = 0.596 D - 0.038 Max. T = 0.274 D - 0.017 Min. H = 0.529 D - 0.042 ref. [Note ( l b 1 Min. T = 0.184 D - 0.015
'/> th r u Max. H = 0.596 D - 0.075 Max. T = 0.274 D - 0.034 Min. H = 0.529 D - 0.078 ref. [Note (1)l Min. J = 0.184 D - 0.027
GENERAL NOTE: D is the basic diameter of the screw. NOTES: (1) Values no longer tabulated; formulas are retained here for reference purposes only. (2) Values based on a sidewall of approximately 2'/,% of the head diameter.
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is blank COPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling ServicesCOPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling Services
STD-ASME B18-6-3-ENGL L998 W 0759670 Ob3'+258 bLb
ASME B18.6.3-1998 NONMANDATORY APPENDIX A
TABLE A2 UNDERCUT FLAT COUNTERSUNK HEAD SCREWS
Screw Size Head Diameter
O thru
'4
Max. A (sharp) = 2.040 D - 0.003 ref. [Note (1)l Min. A (sharp) = 1.960 D - 0.013 ref. [Note (1)l Max. A (rounded or flat) = 1.920 D - 0.003 [Note (2)l Min. A (rounded or flat) = 1.820 D - 0.013 [Note (211 Gaging diameter G = 1.830 D - 0.033
Max. A (sharp) = 2.000 D - 0.063 ref. [Note (111 Min. A (sharp) = 1.920 D - 0.073 ref. [Note ( I ) ] Max. A (rounded or flat) = 1.880 D - 0.063 [Note (2)l Min. A (rounded or flat) = 1.800 D - 0.073 [Note (2)l Gaging diameter G = 1.790 D - 0.093
Max. A (sharp) = 2.000 D - 0.125 ref. [Note (1)1 Min. A (sharp) = 1.920 D - 0.135 ref. [Note ( I ) ] Max. A (rounded or flat) = 1.880 D - 0.125 [Note (2)l Min. A (rounded or flat) = 1.800 D - 0.135 [Note (2)l Gaging diameter G = 1.790 D - 0.155
Screw Size Head Height Slot Depth
O thru Max. H = 0.432 D - 0.001 Max. T = 0.202 D - 0.001 Min. H = 0.386 D - 0.005 Min. T = 0.134 D - 0.001
'4 Max. H = 0.417 D - 0.026 Max. T = 0.192 D - 0.012 Min. H = 0.370 D - 0.029 Min. T = 0.129 D - 0.011
'12 Max. H = 0.417 D - 0.052 Max. T = 0.192 D - 0.024 Min. H = 0.370 D - 0.055 Min. T = 0.129 D - 0,019
GENERAL NOTE: D is the basic diameter of the screw. NOTES: (1) Values no longer tabulated; formulas are retained here for reference purposes only. (2) Values based on a sidewall of approximately 2'4% of the head diameter.
TABLE A3 100 deg FLAT COUNTERSUNK HEAD SCREWS
Screw Size Head Diameter Head Height Slot Depth
O000 No formulas; see tables thru O0
No formulas; see tables No formulas; see tables
O Max. A (sharp) = 2.040 D - 0.003 ref. Max. H = 0.444 D - 0.001 Max. T = 0.222 D - 0.0005 thru [Note (lb1 Min. H = 0.396 D - 0.005 ref. Min. T = 0.184 D - 0.004
Min. A (sharp) = 1.960 D - 0.013 ref. [Note (1)l
Max. A (rounded or flat) = 1.920 D - 0.003
Min. A (rounded or flat) = 1.800 D - 0.013
Gaging diameter G = 1.790 D - 0.033
[Note ( I ) ]
[Note (2)l
[Note (2)l
GENERAL NOTE: D is the basic diameter of the screw. NOTES: (1) Values no longer tabulated; formulas are retained here for reference purposes only. (2) Values based on a sidewall of approximately 2'/,% of the head diameter.
92
COPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling ServicesCOPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling Services
STD-ASME B18.b=3-ENGL L778 m 0757b70 Ob14259 552
NONMANDATORY APPENDIX A ASME 618.6.3-1998
TABLE A4 CLOSE TOLERANCE 100 deg FLAT COUNTERSUNK HEAD SCREWS Screw Size Head Diameter Head Height Slot Depth
O Max. A (sharp) = 2.040 D - 0.003 ref. Max. H = 0.444 D - 0.001 Max. T = 0.222 D - 0.0005
"8 Min. A (sharp) = 2.000 D - 0.009 ref. [Note (1)l thru [Note (111 Min. H = 0.396 D - 0.005 ref. Min. T = 0.184 D - 0.004
[Note (111
[Note (211
[Note (2)l
Max. A (rounded or flat) = 1.920 D - 0.003
Min. A (rounded or flat) = 1.800 D - 0.013
Gaging diameter G = 1.790 D - 0.033
GENERAL NOTE: D is the basic diameter of the screw. NOTES: (1 ) Values no longer tabulated; formulas are retained here for reference purposes only. (2) Values based on a sidewall of approximately 21/2% of the head diameter.
TABLE A5 OVAL COUNTERSUNK HEAD SCREWS
Screw Size Head Diameter Total Head Height
O0 No formulas; see tables No formulas; see tables
O thru
'11 6
' /2 th r u '/'
Max. A (sharp) = 2.040 D - 0.003 ref. [Note ( l ) ] Max. O = 0.923 D + 0.001 Min. A (sharp) = 1.960 D - 0.013 ref. [Note ( l ) ] Min. O = 0.820 D - 0.008 Max. A (rounded or flat) = 1.920 D - 0.003 [Note (2)l Min. A (rounded or flat) = 1.820 D - 0.013 [Note (2)l Gaging diameter G = 1.830 D - 0.033
Max. A (sharp) = 2.000 D - 0.063 ref. [Note (111 Max. O = 0.896 D - 0.047 Min. A (sharp) = 1.920 D - 0.073 ref. [Note (1) l Min. O = 0.789 D - 0.050 Max. A (rounded or flat) = 1.880 D - 0.063 [Note (2)l Min. A (rounded or flat) = 1.800 D - 0.073 [Note (2)l Gaging diameter G = 1.790 D - 0.093
Max. A (sharp) = 2.000 D - 0.125 ref. Min. A (sharp) = 1.920 D - 0.135 ref. Max. A (rounded or flat) = 1.880 D - 0.125 [Note (2)l Min. A (rounded or flat) = 1.800 D - 0.135 [Note (2)l Gaging diameter G = 1.790 D - 0.155
Max. O = 0.896 D - 0.094 Min. O = 0.789 D - 0.094
-
Screw Size Head Side Height Slot Depth
O0 No formulas; see tables No formulas; see tables
O thru 3/s
'4 6
Max. H = 0.619 D - 0.002 Min. H = 0.552 D - 0.007 ref. [Note (1)l
Max. H = 0.596 D - 0.038 Min. H = 0.529 D - 0.042 ref. [Note (111
Max. T = 0.556 D - 0.003 Min. T = 0.460 D - 0.003
Max. T = 0.547 D - 0.029 Min. T = 0.466 D - 0.030
' /2 thru '/4 Max. H = 0.596 D - 0.075 Max. T = 0.547 D - 0.057 Min. H = 0.529 D - 0.078 ref. [Note (1)l Min. T = 0.466 D - 0.055
GENERAL NOTE: D is the basic diameter of the screw. NOTES: (1) Values no longer tabulated; formulas are retained here for reference purposes only. ( 2 ) Values based on a sidewall of approximately 2'/2% of the head diameter.
93
COPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling ServicesCOPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling Services
ASME 818.6.3-1998
STD-ASME BL8*6.3-ENGL L798 0757b70 ObL42b0 274 W
NONMANDATORY APPENDIX A
TABLE A6 UNDERCUT OVAL COUNTERSUNK HEAD SCREWS (Same as Oval Countersunk Head Except as Shown Below)
Screw Size Total Head Height Head Side Height Slot Depth
O thru Max. O = 0.736 D + 0.002 Max. H = 0.432 D - 0.001 Max. T = 0.480 D - 0.001 Min. T = 0.402 D - 0.002 3 18 Min. 0 = 0.654 D - 0.006 Min. H = 0.386 D - 0.005 ref. [Note (1)l
'4 Max. O = 0.717 D - 0.035 Max. H = 0.417 D - 0.026
5; Max. O = 0.717 D - 0.071 Max. H = 0.417 D - 0.052
Max. T = 0.473 D - 0.023 Min. O = 0.630 D - 0.037 Min. H = 0.370 D - 0.029 ref. [Note (1)1 Min. T = 0.404 D - 0.023
Max. T = 0.473 D - 0.033 Min. O = 0.630 D - 0.071 Min. H = 0.370 D - 0.055 ref. [Note (I)] Min. T = 0.404 D - 0.033
GENERAL NOTES: (a) Formulas same as for oval countersunk head except as shown above. (b) D is the basic diameter of the screw. NOTE: (1) Values no longer tabulated; formulas are retained here for reference purposes only
TABLE A7 PAN HEAD SCREWS
Head Height
Screw Size Head Diameter Slotted Recessed Slot Depth
O000 No formulas; see tables No formulas; see tables . . . No formulas; see tables thru O0
O thru Max. A = 1.980 D - 0.003 Max. H = 0.550 D + 0.006 Max. H = 0.692 D + 0.002 Max. T = 0.350 D + 0.001 12 Min. A = 1.940 D - 0.012 Min. H = 0.520 D Min. H = 0.652 D - 0.003 Min. T = 0.300 D - 0.004
thru Max. A = 1.980 D - 0.003 Max. H = 0.550 D + 0.006 Max. H = 0.692 D + 0.002 Max. T = 0.293 D + 0.014 '12 Min. A = 1.940 D - 0.012 Min. H = 0.520 D Min. H = 0.652 D - 0.001 Min. T = 0.246 D + 0.008
74 Min. A = 2.000 D - 0.125 Min. H = 0.520 D Min. H = 0.652 D - 0.001 Min. T = 0.246 D + 0.008 thru Max. A = 2.100 D - 0.140 Max. H = 0.550 D + 0.006 Max. H = 0.692 D + 0.002 Max. T = 0.293 D + 0.014
GENERAL NOTE: D is the basic diameter of the screw.
TABLE A8 TRUSS HEAD SCREWS
Screw Size Head Diameter Head Height Slot Depth
O000 No formulas; see tables No formulas; see tables No formulas; see tables thru O0
O thru Max. A = 2.440 D - 0.015 Max. H = 0.620 D Max. T = 0.350 D + 0.001 12 Min. A = 2.360 D - 0.023 Min. H = 0.570 D - 0.005 Min. T = 0.300 D - 0.004
'14 Max. A = 2.000 D + 0.073 Max. H = 0.520 D + 0.020 Max. T = 0.293 D + 0.014
74 thru Min. A = 1.930 D + 0.063 Min. H = 0.470 D + 0.015 Min. T = 0.246 D + 0.008
GENERAL NOTE: D is the basic diameter of the screw.
Y4
COPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling ServicesCOPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling Services
NONMANDATORY APPENDIX A ASME 818.6.3-1998
TABLE A9 FILLISTER HEAD SCREWS Screw Size Head Diameter Total Head Height Slot Depth
O000 No formulas; see tables No formulas; see tables No formulas; see tables thru 1
2 thru Max. A = 1.670 D - 0.004 Max. O = max. H + max. F Max. T = 0.440 D - 0.001 10 Min. A = 1.610 D - 0.014 Min. O = min. H + min. F Min. T = 0.374 D - 0.007
% 6 Max. A = 1.000 D + 0.188 Max. 0 = max. H + max. F Max. T = 0.500 (min. O) + 0.010
3
Min. A = 0.940 D + 0.178 Min. O = min. H + min. F Min. T = max. T - 0.066 D - 0.005
'/* thru Max. A = 1.000 D + 0.250 Max. O = max. H + max. F Max. T = 0.500 (min. O) + 0.010 "4 Min. A = 0.940 D + 0.240 Min. O = min. H + min. F Min. T = max. T - 0.066 D - 0.005
Screw Size Head Side Height ~ ~~
Oval Height
O000 thru 1
2 thru 7 8
'/2 thru "4
No formulas; see tables
Max. H = 0.660 D + 0.005 Min. H = 0.622 D
Max. H = 0.550 D + 0.022 Min. H = 0.510 D + 0.017
Max. H = 0.550 D + 0.027 Min. H = 0.510 D + 0.022
No formulas; see tables
Max. F = 0.280 D - 0.003 Min. F = 0.240 D - 0.008
Max. F = 0.220 D + 0.006 Min. F = 0.180 D + 0.001
Max. F = 0.220 D + 0.008 Min. F = 0.180 D + 0.003
GENERAL NOTE: D i s the basic diameter of the screw.
TABLE AIO DRILLED FILLISTER HEAD SCREWS
Screw Size Head Diameter Total Head Height Head Side Height Oval Height
O thru Max. A = 1.670 D - 0.004 Max. O = max. H + max. F Max. H = 0.660 D + 0.005 Max. F = 0.280 D - 0.003 Min. A = 1.610 D- 0.014 Min. O = min. H + min. F Min. H = 0.645 D Min. F = 0.265 D - 0.008
~~~ ~ ~~
GENERAL NOTE: D is the basic diameter of the screw.
95
COPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling ServicesCOPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling Services
STD.ASME BLd.b.3-ENGL L998 D 0759670 ObL42b2 047 m
ASME 818.6.3-1998 NONMANDATORY APPENDIX A
TABLE A l l BINDING HEAD SCREWS
Screw Size Head Diameter Total Head Height Oval Height
O000 No formulas; see tables No formulas; see tables No formulas; see tables thru O0
O thru Max. A = 2.100 D Max. O = 0.700 D - 0.010 Max. F = 0.260 D - 0.004 Min. F = 0.200 D - 0.004 "8 Min. A = 1.990 D Min. O = 0.665 D - 0.014
Screw Size Slot Depth Undercut Diameter Undercut Depth
O000 No formulas; see tables No formulas; see tables No formulas; see tables thru O0
O thru Max. J = 0.460 D - 0.010 Max. U = 1.640 D Max. X = 0.100 D + 0.001 Min. X = 0.100 D - 0.004 78 Min. T = 0.390 D - 0.014 Min. U = 1.440 D
GENERAL NOTE: D is the basic diameter of the screw.
TABLE A12 ROUND HEAD SCREWS
Screw Size Head Diameter Head Height Slot Depth
O000 thru No formulas; see tables No formulas; see tables No formulas; see tables O 0
O thru Max. A = 1.887 D Max. H = 0.645 D + 0.014 Max. T = 0.367 D + 0.017 Min. T = 0.277 D + 0.013 "8 Min. A = 1.813 D - 0.010 Min. H = 0.615 D + 0.006
'4 6 Max. A = 2.000 D - 0.125 Max. H = 0.875 D - 0.055 Max. T = 0.498 D - 0.023 Min. A = 1.926 D - 0.135 Min. H = 0.845 D - 0.063 Min. T = 0.380 D - 0.018
Max. A = 2.000 D - 0.188 Max. H = 0.875 D - 0.082 Max. T = 0.498 D - 0.038 Min. A = 1.926 D - 0.198 Min. H = 0.845 D - 0.090 Min. T = 0.380 D - 0.031
and Max. A = 2.000 D - 0.250 Max. H = 0.875 D - 0.109 Max. T = 0.498 D - 0.053 Min. T = 0.380 D - 0.043 3/, Min. A = 1.926 D - 0.260 Min. H = 0.845 D - 0.117
GENERAL NOTE: D is the basic diameter of the screw.
96
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TABL
E A
l3
FLAT
AN
D O
VAL
CO
UN
TER
SUN
K TR
IM
HEA
D
SCR
EWS
Oval
Head
Head
He
ight
H
for
All
Scre
w Siz
es
[Not
e (I)
1
Tota
l He
ad
Heigh
t fo
r He
ad
Radiu
s
All
Scre
w Re
f. fo
r Al
l
Size
s Sc
rew
Sizes
For
max
. H,
us
e m
ax.
shan
k dia
met
er
D,
min
. an
gle
80”
max
. he
ad
diam
eter
A,
and
nom
inal
ra
dius
f?
.
For
min
. H,
us
e m
ax.
shan
k dia
met
er
D,
max
. an
gle
82O
min
. he
ad
diam
eter
A,
an
d no
min
al
radi
us
R
Max
. 0
= No
m.
R =
max
. H
+ F
0.08
m
in.
A
Min.
0
= m
in.
H +
F
L
Flat
Head
Sh
ank
Head
Ov
al
Head
He
ight
H Sc
rew
Head
Di
a. 0,
Di
amete
r He
ight
for
All
Scre
w Siz
es
Size
Size
Max
. M
ax.
Min.
F,
Re
f.
max
. A
- D
Max
. ’
= 2(
tan
40”)
Min.
H
= ~~
~~nA
4~o~
re
f. [N
ote
(3)]
4 3
0.11
2 0.
187
0.16
7 0.
033
5 4
0.12
5 0.
212
0.19
1 0.
037
5 4
0.13
8 0.
212
0.19
1 0.
037
5 5
0.13
8 0.
237
0.21
5 0.
041
3 5
0.16
4 0.
237
0.21
5 0.
041
3 6
0.16
4 0.
262
0.23
8 0.
045
IO
8 0.
190
0.31
2 0.
285
0.07
6 12
a
0.21
6 0.
312
0.28
5 0.
076
12
10
0.21
6 0.
362
0.33
3 0.
060
/4
10
0.25
0 4
12
0.25
0 46
12
0.
3125
46
‘14
0.31
25
0.36
2 0.
412
0.41
2 0.
477
0.59
7
0.33
3 0.
380
0.38
0 0.
442
0.55
6
0.06
0 0.
068
0.06
8 0.
079
0.09
9 ‘8
%
6 0.
375
R i?
GEN
ERAL
NO
TE:
D is
th
e ba
sic
diam
eter
of
th
e sc
rew.
NOTE
S:
(1)
Dim
ensio
ns
have
be
en
dete
rmine
d on
la
rge
scal
e la
yout
s us
ing
the
dim
ensio
ns
spec
ified
in
the
acco
mpa
nyin
g ta
ble
in
the
follo
wing
m
anne
r. m
(2
) He
ad
diam
eter
s fo
r he
ad
sizes
in
dica
ted
are
deriv
ed
from
fo
rmul
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COPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling ServicesCOPYRIGHT American Society of Mechanical EngineersLicensed by Information Handling Services
ASME 818.6.3-1998 NONMANDATORY APPENDIX A
TABLE A14 SLOT WIDTH IN SLOTTED HEAD SCREWS
Tolerance
Screw Size Basic Width Screw Size Plus Minus
O000 thru No formula; see tables O0
O thru Basic slot width = 0.280 D + 0.004 adjusted to O and 1 0.003 0.004 10 standard cutter size 2, 3, 4, and 5 0.003 0.005
6 and 8 0.004 0.005 10 0.005 0.006
12 thru Basic slot width = 0.160 D + 0.024 adjusted to "4 standard cutter size 12 and '/4 0.005 0.006
and 7/,6 0.005 0.008 '/2, 9/16, and 0.006 0.009
'I/, 6 0.005 0.007
3/, 0.007 0.009
GENERAL NOTE: D is the basic diameter of the screw.
TABLE A15 MACHINE SCREW NUTS
Nut Width Across Flats, Size Square and Hex Square Hex Square and Hex
Width Across Corners Thickness,
O thru No formulas; see table Max. G = 1.4142 max. F Max. G = 1.1547 max. F No formulas; see table 12 Min. G = 1.373 min. F Min. G = 1.14 min. F
'14 Basic F = 1.500 D + 0.062 Max. G = 1.4142 max. F Max. G = 1.1547 max. F No formulas; see table
"/8 Max. F: see table thru [Note (1)1 Min. G = 1.373 min. F Min. G = 1.14 min. F
Min. F: see table
GENERAL NOTE: D is the basic diameter of the thread. NOTE: (1) Adjusted to sixteenths of an inch.
98
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ASME 818.6.3-1998
NONMANDATORY APPENDIX B
HEX NUTS WRENCH OPENINGS FOR HEX HEAD SCREWS AND SQUARE AND
Dimensions for wrench openings for hex head screws and hex and square machine crew nuts are provided below in Table B I .
TABLE B1 WRENCH OPENINGS FOR HEX HEAD SCREWS AND SQUARE AND HEX NUTS
Nominal Size of Wrench; Allowance Also Basic Between Nominal Product Sizes - (Maximum) Product
Wrench Hex Head Openings
Hex and Width Across Flats and Hex Square Flats of Screw Jaws of Washer Machine Head or Nut Wrench Tolerance Regular Large Head Screw
[Note (111 [Note (211 Min. [Note W 1 Max. Hex Hex Screws Nuts
Screws
~~
0.1250 5/32 O. 1562 3/16 0.1875 7/32 O. 2 187
'/4 0.2500 'Il6 0.3125 11/32 0.3438
0.3750
'/le 0.4375 '/* 0.5000
'43 0.6250 0.5625
~
0.002 0.002 0.002 0.002
0.002 0.003 0.003 0.003
0.003 0.004 0.004 0.004
0.127 O. 158 o. 190 0.220
0.252 0.316 0.347 0.378
0.440 0.504 0.566 0.629
0.005 0.005 0.005 0.005
0.005 0.006 0.006 0.006
0.006 0.006 0.007 0.007
0.132 0.163 0.195 0.225
0.257 0.322 0.353 0.384
0.446 0.510 0.573 0.636
1 & 2
3, 4, & 5
6 & 8 10 & 12
. . .
4
5 8
12 * . .
74 . . . . . .
2 & 3 . . . . . . 0 & 1
4 & 5 2 & 3
6 & 8 4 10 & 12 5 & 6
. . . 8 '/4 10
5/1 6 . . . "8
. . . 3/8
. . . 12 &
NOTES: ( 1 ) Wrenches shall be marked with the nominal size of wrench, which is equal to the basic (maximum) width across flats of
the corresponding screw head or nut. (2) The allowance (minimum clearance) between maximum width across flats of screw head or nut and jaws of wrench equals
(0.005 W + 0.001). The tolerance on wrench opening equals plus (0.005 W + 0.004 from minimurn). W equals the nominal size of the wrench.
99
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ASME 818.6.3-1998
NONMANDATORY APPENDIX C DIMENSIONS OF ROUND HEAD SCREWS
Dimensions for slotted round head machine screws and Type I and Type II recessed round head machine screws are provided in Tables CI , C2, and C 3 .
TABLE C l DIMENSIONS OF SLOTTED ROUND HEAD MACHINE SCREWS
Nominal Size or Basic Screw Diameter
Head Diameter Head Height Slot Width Slot Depth A H J T
[Note (111 Max. Min. Max. Min. Max. Min. Max. Min.
O000 0.0210 0.041 0.035 0.022 0.016 0.008 0.004 0.017 0.013 O00 0.0340 0.062 0.056 0.031 0.025 0.012 0.008 0.018 0.012 O0 0.0470 0.089 0.080 0.045 0.036 0.017 0.010 0.026 0.018
O 0.0600 0.113 0.099 0.053 0.043 0.023 0.016 0.039 0.029 1 0.0730 0.138 0.122 0.061 0.051 0.026 0.019 0.044 0.033 2 0.0860 0.162 0.146 0.069 0.059 0.031 0.023 0.048 0.037 3 0.0990 0.187 0.169 0.078 0.067 0.035 0.027 0.053 0.040
4 0.1120 0.211 0.193 0.086 0.075 0.039 0.031 0.058 0.044 5 0.1250 0.236 0.217 0.095 0.083 0.043 0.035 0.063 0.047 6 0.1380 0.260 0.240 0.103 0.091 0.048 0.039 0.068 0.051
8 0.1640 0.309 0.287 0.120 0.107 0.054 0.045 0.077 0.058 10 0.1900 0.359 0.334 0.137 0.123 0.060 0.050 0.087 0.065 12 0.2160 0.408 0.382 0.153 0.139 0.067 0.056 0.096 0.073
0.2500 0.472 0.443 0.175 0.160 0.075 0.064 0.109 0.082 5/16 0.3125 0.590 0.557 0.216 0.198 0.084 0.072 0.132 0.099 ’/B 0.3750 0.708 0.670 0.256 0.237 0.094 0.081 0.155 0.117
7/16 0.4375 0.750 0.707 0.328 0.307 0.094 0.081 0.196 0.148
’/2 0.5000 0.813 0.766 0.355 0.332 0.106 0.091 0.21 1 0.159 ’116 0.5625 0.938 0.887 0.410 0.385 0.118 0.102 0.242 0.183
0.6250 1 .O00 0.944 0.438 0.41 1 0.133 0.116 0.258 0.195 ’/4 0.7500 1.250 1.185 0.547 0.516 O. 149 0.131 0.320 0.242
GENERAL NOTES: (a) Use of round head screws is not recommended; use pan head screws. See para. 1.2.11 and Tables 9A, 9B, and 9D. (b) For additional requirements refer to para. 2. NOTE: ( I ) Where specifying nominal size in decimals, zeros preceding decimal and in the fourth decimal place shall be omitted.
101 Previous page
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ASME 818.6.3-1998 NONMANDATORY APPENDIX C
This type of recess has a large center opening, tapered wings, and blunt bottom, with all edges relieved or rounded.
TABLE C2 DIMENSIONS OF TYPE I CROSS RECESSED ROUND HEAD MACHINE SCREWS
Nominal Size or Basic Screw
Diameter
Head Head Recess Recess Recess Recess Diameter Height Diameter Depth Width Penetration
A H M T N. Driver Gaging Depth
[Note (111 Max. Min. Max. Min. Max. Min. Max. Min. Min. Size Max. Min.
O 0.0600 0.113 0.099 0.053 0.043 0.073 0.060 0.042 0.022 0.014 O 0.035 0.015 1 0.0730 0.138 0.122 0.061 0.051 0.082 0.069 0.052 0.033 0.015 O 0.045 0.026 2 0.0860 0.162 0.146 0.069 0.059 0.100 0.087 0.053 0.034 0.017 1 0.046 0.027 3 0,0990 0.187 0.169 0.078 0.067 0.109 0.096 0.062 0.042 0.018 1 0.055 0.035
4 0.1120 0.211 0.193 0.086 0.075 0.118 0.105 0.072 0.053 0.019 1 0.065 0.046 5 0.1250 0.236 0.217 0.095 0.083 0.154 0.141 0.074 0.046 0.027 2 0.063 0.035 6 0.1380 0.260 0.240 0.103 0.091 0.162 0.149 0.084 0.056 0.027 2 0.073 0.045
~~
8 0.1640 0.309 0.287 0.120 0.107 0.178 0.165 0.101 0.075 0.030 2 0.090 0.064 10 0.1900 0.359 0.334 0.137 0.123 0.195 0.182 0.119 0.093 0.031 2 O. 108 0.082 12 0.2160 0.408 0.382 0.153 0.139 0.249 0.236 0.125 0.099 0.032 3 0.108 0.082
0.2500 0.472 0.443 0.175 0.160 0.268 0.255 0.147 0,121 0.034 3 0.130 0.104 5/16 0.3125 0.590 0.557 0.216 0.198 0.308 0.295 0.187 0.161 0.040 3 0.170 0.144 '4 0.3750 0.708 0.670 0.256 0.237 0.387 0.374 0.228 0.202 0.064 4 0.208 0.182
7/16 0.4375 0.750 0.707 0.328 0.307 0.402 0.389 0.241 0.216 0.066 4 0.221 0.196
'/, 0.5000 0.813 0.766 0.355 0.332 0.416 0.403 0.256 0.231 0.068 4 0.236 0.21 1 0.5625 0.938 0.887 0.410 0.385 0.459 0.436 0.292 0.265 0.075 4 0.272 0.245 0.6250 1.000 0.944 0.438 0.411 0.554 0.531 0.318 0.277 0.077 5 0.285 0.244
"/4 0.7500 1.250 1.185 0.547 0.516 0.654 0.631 0.418 0.379 0.088 5 0.385 0.346
GENERAL NOTES: (a) Use of round head screws is not recommended; use pan head screws. See para. 1.2.11 and Tables 9A, 96. and 9D. (b) For additional requirements refer to para. 2. NOTE: (1) Where specifying nominal size in decimals, zeros preceding decimal and in the fourth decimal place shall be omitted
102
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NONMANDATORY APPENDIX C ASME 618.6.3-1998
This type of recess consists of two intersecting slots with parallel sides converging to a slightly truncated apex at bottom of recess.
TABLE C3 DIMENSIONS OF TYPE II CROSS RECESSED ROUND HEAD MACHINE SCREWS
Nominal Size
Diameter
Head Recess or Basic Screw Diameter Head Height Diameter Recess Depth Width Driver Recess Penetration
Recess
A H M T N. Size Gaging Depth
[Note (111 Max. Min. Max. Min. Max. Min. Max. Min. Min. [Note (211 Max. Min. ~~
O 0.0600 0.113 0.099 0.053 0.043 0.073 0.064 0.036 0.025 0.020 . . . [Note (3)l [Note (3)) 1 0.0730 0.138 0.122 0.061 0.051 0.090 0.079 0.047 0.034 0.022 . . . [Note (311 [Note (3)l 2 0.0860 0.162 0.146 0.069 0.059 0.105 0.095 0.056 0.045 0.025 . . . 0.030 0.020 3 Cj.0990 0.187 0.169 0.078 0.067 0.122 0.110 0.067 0.055 0.027 . . . 0.041 0.030
4 0.1120 0.211 0.193 0.086 0.075 0.137 0.125 0.077 0.064 0.029 . . . 0.051 0.039 5 0,1250 2.236 0.217 0.095 0.083 0.153 0.141 0.086 0.073 0.032 . . . 0.062 0.050 6 0.1380 0.26C 0.240 0.103 0.091 0.169 0.156 0.096 0.083 0.034 . . . 0.072 0.060
8 0.1640 0.309 O.lT7 0.120 0.107 0.201 0.187 0.117 0.103 0.039 . . . 0.093 0.080 10 0.1900 0.359 0.334 0.137 0.123 0.233 0.217 0.133 0.117 0.043 . . . 0.114 0.099 12 0.2160 0.408 0.382 0.153 0.139 0.265 0.248 0.154 0.138 0.048 . . . 0.135 0.120
0.2500 0.472 0.443 0.175 0.160 0.307 0.288 0.181 0.164 0.054 . . . 0.162 0.146 5/16 0.3125 0.590 0.557 0.216 0.198 0.383 0.362 0.223 0.204 0.065 . . . 0.212 0.194
0.3750 0.708 0.670 0.256 0.237 0.460 0.435 0.273 0.251 0.076 . . . 0.262 0.242 '/16 0.4375 0.750 0.707 0.328 6.307 0.487 0.460 0.290 0.268 0.080 . . . 0.279 0.258
0.5000 0.813 0.766 0.355 0.332 0.528 0.498 0.317 0.292 0.086 . . . 0.306 0.282 0.5625 0.938 0.887 0.410 0.385 0.61G 0.577 0.370 0.344 0.098 ... 0.359 0.334 0.6250 1.000 0.944 0.438 0.411 0.650 0.614 0.397 0.368 0.103 . . . 0.386 0.358
3/4 0.7500 1.250 1.185 0.547 0.516 0.650 0.614 0.397 0.368 0.103 . . . 0.386 0.358 - GENERAL NOTES: (a) Use of round head screws i s not recommended; use pan head screws. See para. 1.2.11 arid Tables 9A. 96. and 9D. (b) For additional requirements refer to para. 2. NOTES: (1) Where specifying nominal size in decimals, zeros preceding decimal and in the fourth decimal place shall be omitted (2) Point same on all drivers. (3) Not practical to gage.
I03
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