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है”ह”ह

IS 14798 (2000): Aerospace - Self-Locking, Fixed,Single-Lug Anchor Nuts with Counterbore, Classification 1100 MPa/235°C [TED 14: Aircraft and Space Vehicles]

IS 14798 : 2000

Indian Standard

AEROSPACE - SELF-LOCKING, FIXED, SINGLE-LUG ANCHOR NUTS WITH COUNTERBORE,

CLASSIFICATION 1 1~00 MPa/235”C - SPECIFICATION

ICS 49.030.30

0 BIS 2000

BUREAU QF INDIAN STANDARDS MANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG

NEW DELHI 110002

August 2000 Price Group 1

Aircraft and Space Vehicles Sectional Committee, TED 14

FOREWORD

This Indian Standard was adopted by the Bureau of Indian Standards, after the draft finalized by the Aircraft and Space Vehicles Sectional Committee had~been approved by the Transport Engineering Division Council.

The configuration and dimensions specified in this standard are the same as given in IS0 3168: 1998 ‘Aerospace -Nuts, anchor, self-locking, fixed, single lug, with counterbore, with MI threads, classifications: 1 100 MPa (at ambient temperature)/235”C and 1 100 MPa (at ambient temperature)/315”C and 1 100 MPa (at ambient temperature)/425”C - Dimensions’. In addition it specifies material composition and surface treatment required for material of anchor nuts.

For the purpose of deciding whether a particular requirement of this standard is complied with, the final value, observed or calculated, expressing the result of a test or analysis, shall be rounded off in accordance with IS 2: 1960 ‘Rules for rounding off numerical values (revised)‘. The number of significant places retained in the rounded off value should be the same as that of the specified value in this standard.

IS 14798 : 2000

Indian Standard

AEROSPACE-SELF-LOCKING, FIXED, SINGLE-LUG ANCHOR NUTS WITH COUNTERBORE,

CLASSIFICATION 1 100 IMPa/ 5OC - SPECIFICATION

1 SCOPE Only maximum, envelope dimensions and those affecting interchangeability are imposed. The minimum dimensions are limited by the strength requirements. Details of form, not stated, are left to the manufacturer’s option.

This standard specifies the requirements for single-lug, counterbore, fixed anchor nuts, with a self-locking feature achieved by forming the upper portion out-of-round.

~2 REFERENCES

The following standards contain provisions which through reference in this text, constitute provision of this standard. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below:

IS No.

1572:1986

Title

Electroplated coatings of cadmium on iron and steel (second revision)

6603: 1972

10980

Stainless steel bars and flats

Aircraft bolts and nuts (MJ threads):

(Part 1): 1984 Basic profile

(Part 2): 1984 Dimensions for ~bolts and nuts

3 FIELD OF APPLICATION

3.1 These nuts are intended [or use in airborne vehicle assemblies, in which the fasteners are mainly subjected to shear loads. The counterbore on thread size 4 mm and larger is deep enough to accommodate a bolt plain shank in excess of assembly thickness as well as the incomplete threads; 3 mm nut does not have a counterbore.

3.2 They are intended to be used with threaded parts up to l 100 MPa tensile strength classification.

3.3 The cadmium plating restricts the use of these nuts to a temperature not exceeding 235°C.

4 REQUIRED CHARACTERISTICS

4.1 Configuration

The configuration shall be in accordance with Fig. 1.

4.2 Dimensions

All linear dimensions are in millimetres; they shall conform with the table and apply after cadmium plating, but before dry film lubricant.

4.3 Screw Threads

The profile of threads shall conform to IS 10980 (Part 1). The dimensions of thread shall be in accordance with IS 10980 (Part 2).

5 MATERIAL

Alloy steel of grade 15Cr16Ni2 of IS 6603 in hardened and tempered condition or any other alloy steel meeting the tensile strength requirements may be used.

6 SURFACE TREATMENT

The nuts shall be cadmium plated to the Service Condition No. 3 -of IS 1572 or as agreed to between the manufacturer and the purchaser.

7 DESIGNATION

An anchor nut shall be designated by its name. diameter code and number of this standard:

Example :

A self-locking, single lug, anchor nuts with counterbore having diameter code 050 and conforming to this standard shall be designated as:

Anchor Nut 050 IS 14798

8 PACKING

The packing shall be as per agreement between the supplier and the purchaser.

I

IS 14798 : 2000

67 (3)”

F&lWE SHARP EDGES O--l TOO.4 N t-5 I--

T

A$ERNfM;E,, j;COUNTERSUNK RIVET

AS #ibAY BE Di%tEk Of! CUT COU - IFI 0 Y PURCH-

NTERSUNK (AT MANUFACTURER* S OPTION1

FLANGE OR BEADS OPtIONAt

GM OUT OF ROUND IN THIS AREA TO ACHIEVE THE SELF tOCKlNG TORQUE r REQUIREMENT 2)

Diameter Thread’) C D E F G H J” K L

Code

Max Max Min Mm Max Max Max -__.

030 MJ3 x O.S-4H6H -- - 6 6 - - 4.6 6 17.7

040 MJ4 x 0.7-4H6H 6.6 8..5 4.4 2.2 6.2 8 23.7

050 MJS X 0.8-4H6H 0.4 8.1 9.5 8 5.5 2.4 7.3 9 25.2

060 MJ6 x 1-4HSH 9.2 6.5 8.7 10 27.7 I1 2.7 ‘-

080 MJ8 x 1-4HSH 12.8 8.5 10.9 13 29.7

0.5 . 8.5

100 MJlO x 1.25-4HSH 15 13 10.5 3 12.9 16.2 34.3

_ P

9;

NOTE - Tolerances of form and position shall conform to those ~specified in IS0 8788. Details of form not stated are at the manufacturer’s option

t) These values, in micrometres, apply before any surface coating(s) (are) applied The values do not apply to threads, punched holes or shear edges, the surface texture of which will be as achieved by the usual manufacturing methods.

*) Tooling marks permissible in this area.

3, In accordance with IS0 5855.2 in the self-locking zone, the tolerances apply before forming out-of-round.

4, Measured at sharp corners (chamfered) or point of tangency (radiused).

3) Maximum protrusion of the bolt.

FIG. 1 CONFIGURATION WITH CAP

2

Bureau of Indian Standards

BIS is a statutory institution established under the Bureau of Indian Standards Act, 1986 to promote harmonious development of the activities of standardization, marking and quality certification of goods and attending to connected matters in the country.

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Review of Indian Standards

Amendments are issued to standards as the need arises on the basis of comments. Standards are also reviewed periodically; a standard along with amendments is reaffirmed when such review indicates that no changes are needed; if the review indicates that changes are needed, it is taken up for revision. Users of Indian Standards should ascertain that they are in possession of the latest amendments or edition by referring to the latest issue of ‘BIS Catalogue’ and ‘Standards: Monthly Additions’.

This Indian Standard has been developed from Dot : No. TED 14 (140).

Amendments Issued Since Publication

Amend No. Date of Issue Text Affected

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