FED-STD-H28-2B Screw Thread Standards for Federal Services UN Inch
74
● FEFSTD-E28/2S 20 AqJst 1991 SUPEI?SEDItG FED-STD-F128/2A 20 April1984 (seeNote) FEDERAL STANDARD SCREW-THREAD STANDARDSFOR FEDERALSERVICES SECTION 2 UHIFIED INCHSCREW TMEADS- UNANDUt14R THREAD FORMS ,0 This standardwas approvedby theCkxmnissioner, Federal SupplySsrvice,GeneralServicesAdministration,forthe useof al-lEkderalagencies. ● AMc m APEA1’ms DISTFUW1’ION~ A. -Approvedforpublicrelease;distrikxkionisunlimited.
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Federal standard for UN Threads
Transcript of FED-STD-H28-2B Screw Thread Standards for Federal Services UN Inch
●
FEFSTD-E28/2S20 AqJst 1991SUPEI?SEDItGFED-STD-F128/2A20 April1984(seeNote)
FEDERALSTANDARD
SCREW-THREADSTANDARDSFOR FEDERALSERVICESSECTION2
UHIFIEDINCHSCREWTMEADS-UNANDUt14RTHREADFORMS
,0 This standardwas approvedby theCkxmnissioner,FederalSupplySsrvice,GeneralServicesAdministration,for theuse of al-lEkderalagencies.
●AMc m APEA1’ms
DISTFUW1’ION~ A. -Approvedforpublicrelease; distrikxkionis unlimited.
This FederalStadard is issuedin lwsel.eaf formto permit the insertionor removalof new or revisedpagesard sections.
All usersof FederalStadards stculdkeep them up to date by insertingrevisedor new pagesaa issued* removingsu~seded ad canceledpages.
w ad revisedpageswill be issti tier ChangeNoticeswhichwill benunberedcmsecutivelyad will bear the date of issuance. ChangeNoticesshouldbe retainedd filedin frontof tk stadard untilsuch timeas theyare s~rseded by a reissueof the entirestardard.
EtnawmI,., ,
This secticnwas develqed b provideUnified InchScrewThreadabr theFederalServices. It Q formxly kmwn as “UnifiedThreadI@rm ad ThreadSeriesforBolts,.!kretrs,Nuts,Ta~ BolesaM GeneralAppli=tions=.EEWS1’&H28/2Aws a Ca@ete revision of FR%7TWB28/2 dated 31 March 2978.It added the nsiterialpreviouslyidentifiedas FfD-sTD-H28\3dated31 March 1978,whichwas knownas “UnifiedThreadaof SpecialDianeters,Pitches,.ad Lengthsof Engagenx2nt”.&terial franAppmdices A3 ad AS ofFED+IWB28 dated 31 March 1978was revisedad tecaueApprdies A and B,respectively,of FBD-STD-E28/2A.
.,,...,, .,,,....:, ,, ,. .,.. .. ..... ,., ●FSD-51WH28/2Awas preparedby tk CefenseIndustrialSup@y Center ~-IS)
and inoxpxated theAmericanNeticnalStardsrdb’ Unitied InchScrewThreads,WI B1.1-1982. Significzmtchangesfranthe previousissuesincltiedthefollowing:
(1) AddedUNR, externalthreadformwith mandatoryroundedrrnt.(2) Sevisedtolerancerequirementsfor leadand flankangles.(3) Added requirementstir controlof surfacetixture,cknfers, ad rolled
threadled-ins ad run-outs.(4) Added requirementthat inspectionmethodsfor acceptabilityare in
aaxmdance witb FER51D-H28/20.
FED-STWH28/2BincorporatestheAmericanNationalStandardfor IJnified InchScrewThreads,A.SNZB1.1-1989whichsuperssdsdA!W B1.1-1982and itssuPPl~t , At=z B1.1s-1984. It @ates theFEE.S’K)-H28/2Adated 20 April1984ad improvesthe legibilityof the tables. ~ndix C was .dded toprovideinfonnaticmalxmt tk obsoluteAmrican Naticna3form threads.
ii
FED-sl’D-H28/2s
SETIOW 2 - UnifiedInchScrewThreads-UW ard UNR ThreadFOrIUS
1- ~ ~is ~tion providesthe standardfor WIified inch ~rewthreadsto be used by the FederalServices.
1.1 ,Qm.itations.(My uw ad UWR screw threadsare cmered in thissection. Ebr UNl threads (axkrolledexternalthreadrouded root withincreasedbasicminordiamter) see FED-STD-H28/4(MIL-S-8879). For UN!threads(miniaturethreada)aee FEO+lD-H28/5.
1.2 Application.
1.2.1 UW form screwthreads. The uw threadis intendedfor generalpurposefastening~~i-G; Its externalthreadroot may be either flatorrourikd.
1.2.2 UWR form scrqg i+reads. The UN’Sforma@ies mly to externalthreads. Y&~l~&n IS the sa.m as thatof the external UN thread exceptthat the rcot is requiredto be rourxled.UNR threadsare appliednmt often ‘mhigh volum annnercialfastenerthreadsproducedby rolling.
Nnz: The uardatiryroumiedrcotof the UNR threadgreatlyreducesthe wn02ntrationof stress,knee increasesthe fatiguelifeof threadedpr ta.
2. Referenceddcmnrents.——. —
2.1 Governxren~uMications. The issuesof * following&amenta in..—effecton the date of—invitationfor bids or rsquestforprqosal km a partof thisstandardto theextent~cified &rein.
FederalStadards...- ——-—
FElE71EH28/1 - Nxrenclatue,Definitionsand LetterSymkmlsforScrewThreads
FED-S’IEE28/6- Gagesti Gagingfor UnifiedScrew Threads
FED-SlWS28/20- InspectionM?tkds forAcceptabili& of UW, ONR,UNJ, M and Ml Screw-Threads
(Activitiesoutsidethe FederalGmernnent my obtaincopies of Federalspecifications,stardards,and ccaurercialitemdescriptionsas outlinedurilerGeneralInformationin the In5exof FederalSpecifications,.%an5ards,adCrammsrcialItem Oescriptions. The Index,which includescumulativebi-nnnthlySU@SIEntS as issued,is for saleon a subscriptionbasisby the Superinten+ent of Dccunenta,U.S.GovernmentPrintingOffice,Washington,IX 20402.
FIm-s13H128/2B
(Singlempies of thisstandardand otherF&eral specificatims, standardsad cwmercial itemdescriptionsrequiredby activitiesoutsidethe Federal ●@vernment for biddingp~ses are availablefrcxnthe GeneralServicesAdministrationSpecificationSection,Ftxxn6654,7th ard D Streets,S.W.,Washington,CC 20407;telepimw?(202)708-9205.
(FederalC%vermrentactivitiesmay obtainaypiesof F@deralstardardizationdocumnts, ad the Indexof FederalSpecifications,Standards,and (kxnnercialItemEescripticmsfran-est?bliskldistribution@nts in theiragencies.)
2.2 Otherpublicatims. ‘Illsfollowingdocummts forma part of thisstarxlardto the extent~ified herein. Unlessa specificissueisidentified,the issuein effectm dateof invitationfor bidsor requestforpropaal shallapply.
Ameri- Watimal Standards.
?@E El.1-1989 - Dnified InchScrewThreads (LIWad ONR Threadmm)
AMI/ASMZ B46.1- SurfaceTexture- SurfaceFImghneas,wavinessandLay
(A@icatia for rxpiesshouldte a&3ressedto theAmericanSocietyofWchanical Engineers,UnitedEngineeringCenter,345 Eakt 47thStreet,Wew York,WY 10017or theArericanNatimal StsndsrdsInstitute,H West 42ndStreet,Wew York,WY 10036.) ●
3. Definitions.The termsa~licable to thisstandardare definedinEEEsm-B2&/l .
4. Generalrequiremnts.
4.1 Screw threads. Unifiedinchscrewthreadssbal.1@ in,arxxx&ce withASMS B1.1-1989ad thisFederalStarderd. Qily Stam3ardSeries UnifiedScrewl%rezxls,listedin Table 3A of ASMEB1.1-1989,shallbe used for new designforthe FederalServicesunlesspriorapprovalhas beengrantedby theprmxreuentautlxxi~ to deviatefrom them. Coxae ad finethreadseriesare preferred.
4.2 AcceptabilityScrew threadinspectionmetl-dsfor acceptabilityshalllxsin arxxxdancewi~ E’ED-SD+328/20.The requiredgagingsystemshallbespecifiedin accordancewith thatstandard.
4.3 Gaqesad gaginq. Gagesand gaging shallbe in accordancewithFE&51D-H28/6.
5.1 Diamter~itch mubinations. When standardsize screw threadsreferredto..in.4.l.canno.t..lz2.used,..tbe.designez..kcddddchaos.e+referred.siz=sof.-ti’yeadslisl@ in ‘1’@.le3B of M B1.1-3.989.lf this is,not pssible,onsiderationslxxidbe gi.yento the folbi.ng sub-paragraphsin the choi~ ofthread.
5.1.1 Preferredrun-standarddiameters. tb?neverpossible,‘& ~diamter stwuldbe selectedEran seriesof dimretarincrementsas follows:
Diauk?terrange
inch
0.25 to 0.6stove 0.6 to 1.5abve 1.5 to 6.0stove 6 to16akove16w24
Firstchoiceincrelent
inch
0.050.10.250.51.0
Second&sireincreumt
inch
—
.0.050.10.250.5
It is rewmrendd thatdianetersless than 0.25 inchanform b the standardsizesaa there is virtucdlyno necessityfmr the selectionof a diameternotinclded in * sizes. A.1.eo,i+? ax.rseand fine thread series provideamplechoiceof‘diamstet-pitchccmbinatkms. -
5.1.2 Preferrednrn-standardpitches. 14kneverpossible,ti pitch shouldbe selectedfrcxoaae of the following: 40, 36, 32, 28, 24, 20, 16, 12, 10, 8,6and4threada per inch. Intermediatepitdieaalx3uMb usedonly whenabsolutelynecessary. Pitchesccarserthan 4 threadsper imh are notrecxxmnmded.The curvesslx%n in Figure2.B.2of -ix B cover thepracticaldiaueterlimitssuggestedfor each pi@.
5.2 Threadclassselectia. StandardUnifiedthreadclassesand theirapplicat~ection 4 of rk5MEB1.1-3989. when selectingathreadclass,considerationskxd-d firstbe given b & use of a class ~externalthreadwith a.c3.aas28 internalthreadsince theseclassesaredesignedfor generaluse. Before specifyingclass 3M3B series,it met beconsideredwhetherthe additionalproductkm mst, necessaryfix the tighterfit and toleranm is justified. If a fit Imser than the sbndard class NIBis required,* rm~referred classIAR may be .spsifiedfor an externalthreadof 16 threadsper inch and marser. This specialclassombines thelargerallowanceof the old AmericanNationalclass1 threadwith the Unifiedclassn toleranm. See 5.2.2 for classN al.lmenm.
e 3
I
FEFS1’Mi28/2B
5.2.1 Replacementsfor &solete AmericanNationalthreadclasses. Whenthreadsspecifiedwith the obsoleteAmericanNationalthreadclassesare to be ●replacedby unifiedthreads,the followingguidelinesare provided:
a. AmericanNationalclass1 coarsethreadsizes (tK!-l)is approxi-matelyequivalentto UnifiedclassIl@l series. C3.aSs1 finethreadseries (N&l) is approximatelyequivalent dirn?nsionallytoUnifiedclass 2A/2Bseries. StandardUnifiedseriesthreadsshould~, consideredprior bJ approvalof replacxznentby rzm-sta!xiardthreads.
b. Amrican Natirnalclass 2 rrarsethreadseries (K-2), 8 threadseries (EN-2), 12 threadseries (12N-2), 16 threadseries (MN-2),ad extra fine threadseries (NEF-2)are mxt nearlyequivalentto Unifiedseries13N2-21@, 8UN-2@B, 12Ut+2A/Z, 16UN-2A/Zad UNEF-2A/Z3,respectively.Class 2 fine threadseries (W-2)is approximatelyequivalentdimensionallyto Unifiedclass 3A/3B
series, but the use of class 2?@3 series should be omsideredprior to approvalof replacementby class3A/3B.
c. AmericanNationalclass3 seriesK-3, NY-3,FIEF-3,EN-3,12N-3and 16N-3are nest nearlyequivalentb Unifiedclass 3 seriesUN2-3A/3B,UNF-3A/3B,UNEF-3#3S, 8UN-3A/35,12UN-3A/3Bad16UN-3@B, respectively,
d. There is no Unifiedthreadclass equivalent@ the old AmericanNationalclass 4 whichrequir~ sel~tive fit of ~ts due ti the ●pxsibility of interference. “
5.2.2 Threaddbwance~bleranoa . Mbwances and tolerancesspecifiedfor sti~~ Unifiedthreadc.la.ssesare descritedin Secticn5 of A94E B1.1-1989.Ebr the spscialexternalthreadclass N, tolerancesare the saneas fir class3A and allowsnces are as follows:
Threadspr inch I Class lAR allowanm
16141210864
To ccxrplerrentparagraphhole sizelimitsbeforeincltiedin A-d ix A.
inch0.00180.00210.00240.00280.00340.00440.0064
5.6 of ?ENE B1.1-1989,reccnmnded tap drill sizes*threading,fordifferentlengthsof engagement,are
4
FEo-mB28/2E
5.3 -tion. Designationof Unifiedscrewthreadsis in axordanoe.—with section6 of AWE B1.1-I.989.tkini.na.lsize shallbe statedin dec~.Tk symtol~ is appli*e to any thread:
. . .. . ., .......
(1) havingthe taaicUnifiedthreadform
and (2) with limit5baseduponUnifiedformulations
arrl (3) which is not in the s~ard serieslistedin Table 3A ofASM?,B1.1-1989.
5.4 Limitsof size. See section8 of IXiMEB1.1-1989for limitsof sizeofstardardand preferrednm-a~ard threadsand km inbrmation used hrcalculationof nm-stardard threadsize limitswhichare not tabulated. Forclassm, calculateas br clasaIA exceptallowanceis tabulatedin 5.2.2.The followingexanpleillustratest& prccedurenecessaryto alcul.atethelimitsof sizeof a mn-starrhrd thread;this follow-sthe outlinesin tablesIAand lB of ?x?!MF,B1.1-1989:
Externalthread,2.500- 28UtG-2ALengthof engagement,1 imh
Maximm major diamter = Mxninalsize - a319wlnce(section13 of ASkE B.I.1-3989)
= 2.5000- 0.0014 (frantable32 of X!& B1.1-1989)= 2.4986
Mininnnnmjor diameter. Mdn’nunmajor diameter- tolerm%e(section 13 of ASMEB1.1-1989)
= 2.4986- 0.0065 (frantible31 of ?@4E B1.1-1989)= 2.4921
kiaxinwmpitchdiamter = Maxinnnnmajor diamtir - hk(table6, CO1. 13 of FtiN8 1.1-1989)
= 2.4986- 0.0232 (rourdedfrcxnO.023197)= 2.4754
Minimumpitchdiameter= M&mum pitch diamter - tolerance(section13 of A94E B1.1-1989)
5 2.4754- 0.0056 (frantable34 of XiFIEB1.1-1989)= 2.4698
Naninal (mximmn)minordiamter
= WXimm major diamter -?(table6, CCL 15 of ASMSB .l-1989)
= 2.4986- 0.0387 (rouded from 0.03866)= 2.4599
5
Fm-sImB28/213
Internalthread,2.500- 280N5-2%(b mate with the atrm thread)
Minb.nn&r diaueter. ~ size- 2%(table6; ml; ISofiU3MEB1:l-19S9)
= 12.5000-0.0387(roundedfrom0.03866)= 2.4613which is rcundadti 2.461
!.laximumminx diaueter= Minim.nnminor dianeter+ tolerance(sectim 13 of ISQZ B1.1-3.989)
= 2.4613+ 0.0063 (frantable39 of ASMEB1.1-1989forlengthof engagementof O.43)
= 2.4676which is rourdedW 2.468
Minimumpitch diameter= Nminal size- h(table6, ml. 1! of = _B1.1-1989)
= 2.5000- 0.0232 (rourriedfrom0.023397= 2.4768
Maximumpitch diameter= Mininunnpitchdiameter+ tilerance(sectirm13 of ~ B1.1-1989)
= 2.4768+ 0.0073 (frrxntie 37 of ASMEB1.1-1989= 2.4841
Mdna.1 (minim@ major= Minimum sizediameter
= 2.5000
Factorsused in the designof threada,particularlyspecialthreads,arepresentedin -ix B. It is to be noted thatdeviationsfrcanstiard~ler-s for majordiamter of the externalthreadard forminordi.amterofinternalthrerdmay be necessaryin order to arriveat th optimumdesign.
5.5 Surfacetexture.
5.5.1 l!he~ sbiillhave a smoth finishend te free firm flawsandotherdefects,suches fins,nicksand burrs,thatwouldmake them unsuitablefor * purpae intended.
5.5.2 Wdonanahip shallbe rrmaistentwith the &Jeranms specifiedherein. Surfacetextureof threadsprodumd b thisstamiardshallnot exceed100 microincharit.beticalaverageroughness (~) for at threads ~ 63microinch(~) for rolledard groud threadsin ar- with AISI/M?4ZB46.1.
WE: c2xrsead finepitch threadswith xoughsurfacetextureare tmre likelyb cross-thread.Threadswith chamferedenteringends have the leasttendencyto cross-threadwhen assembledwith pwer tmls.
6
E’Eo-sTrM28/2B
5:6 Chrunfer.
5.6.1 All enteringendsof externallythreadedfastenersand threadedcqenti _ have 45° Chamfecs(approxhately)frcunminor diametersorslightlyhelm mimr dianeters,unlessotherwi~ specified.
5.6.2 All enteringerdsof internallythreadedfaatenersand threadedcrspnents shall have nminal 900 -120° countersinksb or slightlygreaterthan the threadnjor diaueters,unlessotherwi= specified.
5.7 ~lled threads.
5.7.1 C4xrple&lyforud threads.threadprofile,w~thi.nthe tolerance(seefigure2.1).
5.7.2 InaaT!Plete formedthreads,
A carpletelyforned threadfollows the
znneover an axialdis=ce of cne pib=h
5.7.2.1 The lead-inthreadis measuredfran tk ed of the productto thestartof the firstcaupletet.hceadwhere themjor dianeteris equal b theminimumati~e majordiaueterad the threadrcot is egua.1to the maxiunnnminordiauetir. This slrxddnot exceed2P (seefigure2.2).
5.7.2.2 The run-outthreadis neasuredbetweenthe transiticm@nt of theproductad the firstthreadroot which is anpletely formed,where th minordiaueterequalsthe ue.xinumpermissibleminordiamter and the najordiam?terof the last fullyformedthread_ the minimumpenuissiblemajordianeter.When rcmtradiusis specified,1A? last cmpletely t%rmd rcotat tk minordieuetermust met the reguireuent.See figure2.3 for full shankfastener,figure2.4 for pitchdiauetershankfastener,figure2.5 for shouldertolt,figure2.6 for oversizediametershankfastenerand figures2.7 and 2.8 Jimthreafledto hed fasteners.
6. Notes..—
6.1 ~~rsession note. In additionbJ supersedingFED-STD-H28/2Adated20 April198~~~~-&~nt alrn superseciesAppendixXL of FED-SZD-H28dated31 March1978.
I 7
FED-S’I’&H28/2EJ
+-- r“.’ WI?,*D +
I I I r 6 BASIC MAJOR m
—+— —
d UIN MAJOR DiA
— — — -62 B.UX PITCHCU
I
I I I
‘d3MlN FOUNDEDROOT MJNDR VU
FIGURE 2.1 COMPLETELY FORMED EXTERNAL THREAO
w LEAD THREADS = 2P UAX
w
1
t= WD W SI+M
FIGURE 2.2 INCOMPLETE FORMEO EXTERNAL THREAOS, LEAD-IN THREADS
I
I
F131-~H28/Z3
●
+---- MAX RUN””,.2, ~ mMPL~ ~REMS —
FIGURE 2.3 INCOMPLETE FORMED THREADS, FULL SHANK
FASTENER -STANDARD DIAMFTER
F’=-;ETET”RE— -l—- —’
d M!N M4.JORDIA
f~”,~fi
FIGURE 2.4
+
INCOMPLETE FORMED THREADS, PITCH DIAMETER
SHANK FASTENER
9
FECHTE-H28/?B
~MINRuNwT=lp+w.y
--
FIGURE 2.5 FULL SHANK FASTENER -STANDARD DIAMETER,
OPTIONAL CONFIGURATION (SHOULDER BOLT)
t-
MAX RUN0U7=2P+0VERS12EINCREMENT+ z TAWe MIN)
+
COMPLETE THREADS —
km iwNw7. u=+WER -
y
SIZE INCREMENT + z Tb.N
12.~ 35.
!
-1/2 WERSIZEINCREMENT
NOTE:—- —
e =7RANs1710NTAPERANGLC
63 MAX WNDED ROOT MIMCf7ou
FIGURE 26 FULL SHANK FASTENER-OVERSIZE DIAMETER
FElHmHu8/2s
E’::::,xT-”—
— d UIN MAJW WA
w—–‘d, MAX RtMSCCD
\~wJTuBK%lw——
A
FIGURE 2.7 FULL SHANK FASTENER -THREADED TO HEAD
W4DERHEA9 SURFA~
w UAX *2P +UAX FILLET RADfus mMFu_FE ‘mF(E4Ds —
MAX
~[z
1- W MINs0.6PFILLET + MAX FILLETRAlus RADIuS
-I_’l.-7“
‘+- TwU.D,A\\
.~
I
d,MAX RIXJNSCD
LROJT MINCM 91A
v
FIGURE 2.8 PITCH DIAMETER SHANK FASTENER -THREADED TO HEAD
‘o1-l
FED-STD+i28/2B
APPENOIXA
TAP DruLLsm AmiamMmKm SCKE SHS?,LIMI’ISSEF?M?,5i353WW
10. Smpe. ~is a-ix providessuggestedtap drillsizesandrecrmmkied hcle size limits@iCable prior b firminginternalUnifiedscrewthreads. It is not a mandatorypart of tbe standard. The infonrati.mcontainedhereinis intendedfor guidanceonly.
20. ‘hp drillsizes.
20.1 General. ‘Ibassurethat the mirmrd~ter of an internalthreadisheldwithinspecifiedlimits,it may be necessaryto use a reamerto finishthehole. A varie~ of factorsenters inb the productionof a clean,mud,straightlmle of tk currectdiameter. For a discussionof Mae ad otherdata on drillingd @ping, referen~ my be made b “DrilledEoles forTapping”,a publicationof the UnitedStatesCuttinglbol 11’EtitUtd,1230 KeithBuilding,Cleveland,~ 441J.5.
20.2 !IabU2ateddata.
20.2.1 Table 11.A.1givesminordiameterlimitsand correspdingpercentagesof threadfor s3.2staderd seriesthreadsup b @ i.nddiq 3.75inchdiameterfor classesI.Band Z. Teble 11.A.2 is a similartatd.efor class ●~. These tablesalso listsizesof drillsthat nay h expectedto drillholeswithinor nsar the specifiedminordiamter limits. Tlxsdiameterof the drill,the probableInle size,ard the correepmiingpercentagesof thred aretabulated.
20.2.2 ~ a drillmay mxmal.lybe expectedto cut oversize,probabletdesizesare tabulatedthatare derivedfranprobablenmn oversi~s, &Mxilated. The followingis quotedfranthe ~tionad reprt: ‘...aseriesof testswas amducted by drillmanufacturers.Using six sizesofdrillsrangingfrrxn1/16” to 1“ in dianveter,a totalof 2,808holesweredrilledin cast ironad steel. Regularhigh speedsteeldrillsware usedwithdrilli.rqequi~t of the typenormallybud in metslmrking shops.... ~aver~e depthof kde drilledwas equalto 1-3/2 tinesthe dril..ldiemeter.&aeureurantof the lmlewas made at midpcintof the ds@ drilled....Theaverageof the...aumlntsoversize..shows a marked increasein arountwersizefordrillslargerthan 3/4”. For this size range reaming is recrmm&d. ”
12
EZD-SDH28/2B
20.2.3 “Pe&eit of thretilistedin’tablei”is t& ratio“A P&& of theacti heightof tbred to & value O.75H;thisvalue is the basicthreadheightof the oblete AuericanNational‘l’’breadProfile. Since the basicheightof a Ilnified ThreadProfileie 0.625H,the maximampercent-tiedpermissibleis 83.3%. Due to allnwmces ~r drillsto cut oversizeor due tolackof availabilityof drills within~cified minordiametirlimits,tapdrillslisted in tables11.A.1d 11.A.2nBy sbw greaterthan 83.3%threads.This indicatesthatthe drill size is smallerthan the minixm.rnthreadminordiameti arxladditional~hin~ of the hole my ha neoesearyin order topermit ecommlicaltapping.
30. ,Rermm’d d tde size limitsbeforethreadinq.
30.1 Genera+. Rx short lergthof engagement,the imleprior.to threadingslmti be heldnear the minimmnlimit toheightfor maximumjointstrength. AS lengthof engageurmt
diam?~ reouirednnximise th&adincreases,it is
advantageoustrJincreasetbe bok di.amterfor uore e&mcunical** withless riskof tap breakage. Therefore,* followingreccammdaticasweredeveloped(alsosee 30.2 telow):
Lenqthof Engaq@m?nt
Upto
Atove
Abve
Atove
and incltiing 0.33D
0.33D thru 0.67D
0.67D thru1.S)
1.5D tkll 3.OD
Minimm Eble Size—.—.
M.iniumminor dia
Min m.imrdia plusl/4 minordia tiler-
ti.inmi.mrdia plus1,/2mina dia tilerance
Min mimr dia plus3/4 minor dia tolerance
MasinumEbleSize————
Mn minx dia plus3/2 minor die tilerarce
i+linminimdia plus3/4 minordia tolerance
Max minordia (reinmirsxdia plus tolerance)
Max mirmr dia plus l/4-r dia tolerance(see30.2)
Fran the foregoingit will k seen that & differen~ betweenlimitsin eachrange is the w and egud to halfof & minordiametertmlersome.This is ageneralrule. B’xever,the minimumdifferen~s for si~s below0.25 in. areequal b the minordiamtir tolerancesgiven in tables39 and 40 in ASMEB1.1-1989for lengtheof engagementto and includingO.33D. i%r lengthsofengagementgreaterthanO.33D for sizes0.25 in. ad larger, the mininucn values
are adjusted sc thatthe differencebtween limits is never less than0.0040in.
13
FED-STD-H28/2B
30.2 l’abulatedd= Recomnmded hole sizelimitsfor stadard LJnified
threads a~ scam?Speczal (UNS)threadsare given in tablesII.A.3ard II.A.4. ●For other specialthreads,calculatein acmrdan~ with 30.1 almve;use mi.niim.rmminordiaueterad tolerancefran table3B of ASME B1.1-1989,or calculateinaaardanos-withsectian8 of ASME-Bl.q-1989ushg’Spprcpfate toleranoefrantable39 or 40 of lSKE B1.1-3.969fortoleran~ ratioof ‘1or frrm firmlas bPara9r@ 5.8.2of - B1.1-1989. Tabulatedhole sizesad Imle sizescalculatedin accordancewith 30.1 are not mrdatory unlessthe threaddesignationstatesthe ndified minordiarreterlimitsard & designationMXlin accordancewith paragraph6.7 in ~ B1.1-3989. If mdified minor diameterlimitsare not specfied,acceptancewill be in acrmdance with stardardminordiameterlimits.
Ncn!E:~ed maxinnnnhole sizesin 30.1, for lengthsof engagsrmkgreatertha 1.SD are outsidestarxiardminor dianeterlimits. They are notincltisdin tables11.A.3and 11.A.4. Use of a minordiamter hrger thanstandardwill resultin a reductionin sheararea of the externalthreadsofthematingpart. If manufacturingprocesspermits,maxinznnhole size beforethreadingskuld ke maintainedat the high eti of the stardardmi.mr diameterlimits.
30.3 Otherccmsiderations.When tappingrelativelysoft materials,especia~--f i.nepibch threads,thereis a terdencyfir the materialto besqueezeddown towardsthe rrmt of the tap so that the minor diameterof thetappedhole uay.berxwresmallerthan the diameterof the drilledtnle. It maybe necessaryto try a differentsize drillor differentstyle tap to assureasatisfactorythread. ●...
.
jm
—-—_—. ... . . ..-- __ —____ . . . . -
15
FED-STD-H28/2B
xInI-
&II
u0
16
.: :,,
17
FEESTD-H28/2B
18
E%&SlEH28/23
...i
—
—
—
FED-Sl’’D-E.28/Z0
.+
—
—
—
—I
J —
—
- —, —
11
●
In0
20
Fm-s’llH128/2B
—
—
—
—
4.+- . . ..-. . . . . . . . . . . #-l . . ..-..- ++.4. . ..-. . . . .—-— =i- ~-++—
21
FED-STIH128/2B
I
—
‘1
-.4..-. 4.+ .+-.A. 4+-.-!”. .++-. . ... . . ..4+.-. m~w%=— +-
22
—
11—
!-II
I I —
—
23
—
—
—
—
—
—
—
.
—
—
_
—
FED-srD-H2f3/2B
I
m
~
l-l
-
2s
—
FED-srBH28/2B
26
EIZ)-SIQ-H28/2H
ii
l?ED-sTIHG!8/Z3
28
F12?-.SlQ-H28/2B
●
N0+L-1n
ii
.j
5-15Wl2°3
I ~ I i
I I iI
I 1‘I I II
29
FEW5TD-H28/2E
I
—
—
m1111
ii
30
F311-STD-H28/ZB
0
31
Fl?QSTD-H28/213
i I I ‘ I’11I I
s
s
32
.
5
S’imm
---
EED-ST13-E28/Z3
33
EED-S’IT2-H28/2B
‘2nsLs11.A.3- ~ ~le size lim2fs tefore threading for different lergt.hsof e!qaqsrr?nt,stm3ardUnifid ad saa? UtG threads, c3ds.se6IB and 272 (see 30.1) IJ
Sm.iml size in fncb22ard thteds &Er kc!)
1
.06C+0 or M. 0-44
.07344 or M2. l-a
.073-72or h. 1-72
.08+56 or f&. %56
.006-64or N2. ‘WJ4
.099-48or m. 2-48
.099-36or M. 3-56
.112-40or m. 4-40
.U-48 or !b. 4-48
.125-40or 242.5-40
.n5-44 0s m. 5-44
.232-32or w.. 6-32
.13s40 01 m. 5-40
.16+32 or NO. 6-32
.164-36or WA 8-36
.190-24or lb 10-24
.290-32or 243.lC-32
.216-24or lb. 2.2-24
.21620 or m. 12-28
.216-32or M. 12-32
.250-20or 3/4-20
.250-22or 2/4-20
.250-32or L/4-32
.250-36or 3/4-36
.50C-22or 3/3-12
.500-13or 2/2-13
.500-16or W-16
.50C+20or 3/*Z
.500-38or 3/3-2E
.50C+32or U2-32
See fmt730tesat e
Seriesdesignatim
2
Ow
mcUfw
oxLaF
LxUNF
OKw
mc13mLmPUw
Luc2amw2WNCKmw
w2CmCm2mUMTma
ox16U4w
32m
of table.
—minx di=ter of internaltieais
3
~
0.0465
.0561
.Osao
.0667
.0691
.0764
.0797
.0049
.oa94
.0979
.1004
.104
.22.3
.130
.234
.145
.356
.171
.177
.182
.196
.211
.216
.220
.252
.256
.267
.274
.279
.282
.307
.322
.330
.336
.341
.345
.360
.370
.303
.399
.404
.410
.417
.432
.446
.461
.466
Percmdof
tied
4
83.1
83.383.1
83.283.3
83.503.2
83.483.5
M83.883.1
a3.i383.1
83.183.8
83.124.183.8
83.184.183.083.1
83.883.964.183.0a2.584.5
63.8a3.163.184.1a3.B83.1
83.583.1a3.983.082.5
83.1E3.183.683.104.183.8
5
in0.0514
.0623
.0635
.0737
.0753
.oa45
.0865
.0939
.0968
.1062
.1079
.324
.2.39
.139
.142
.2.36
.164
.3al
.106
.140
.207
.220
.224
.226
.265
.270
.277
.222
.2s6
.ZS9
.322
.332
.340
.345
.349
.352
.376
.3a4
.395
.407
.411
.42a
.434
.446
.457
.470
.474
PmmYof
nueed
6
53.0
S?.732.7
53.052.7
52.653.9
55.756.2
59.158.5
61.6a.o
62.864.0
64.764.764.0’
66.264.7
R
65.B65.465.665.765.365.1
66.566.264.764.764.063.7
66.365.965.465.765.3
66.566.066.566.2
H
34
●
Htntlmml
0.&65
.0563
.0560
.0667
.0691
..0764.0797
.0849
.0894
.0479
.1004
.104
.332
.230
.134
.145
.156
.m
.u7
.M2
.296
.22.3
.216
.2’M
.252
.254.
.167
.274
.279
.202
.307
.322
.330
.336
.342
.345
.360
.370
.383
.399
.404
.410
.U7
●.432.446.4Q.466
mxifm
B
2n0.0500
.0599
.062.3
.0705
.0724
.0604
.0831
.oa49
.0931
.1020
.Lou
.109
.235
.135
.228
.250
.160
.176
.182
.3B6
.202
.216
.220
.223
.259
.264
.272
.276
.262
.286
.314
.327
.335
.340
.345
.348
.368
.377
.389
.403
.407
.429
.425
.422
.452
.466
.470
limits for diftesent;
AtlYM 0.330 &“ o.6m
UlnImm
9
0.;79
.0560
.696
.0626
.0707
.0785
.0014
.0871
.0912
.1000
.1023
.106
.223
.132
.136
.147
.E8
.m
.179
.264
.B9
.233
:%
.256
.261
.27o
.276
.220
.203
.323
.326
.332
.338
.343
.346
.364
.373
.386
.403
.405
.414
.421
.436
.449
.463,468
10
in0.0514
.062.6
.0624
.0724
.0740
.0225
.0848
.0916
.0949
.1043
.1060
.2.22
.U7
.137
.140
.253
.162
.178
.184
.288
.204 .(
.222
.222
.225
.262
.267
.275
.260
.284
.287
.318
.330
.337
.343
.347
.350
.372
.320
.392
.405
.409
.423
.430
.443
.454
.468
.412
* of ~t
M0m3 0.670 thru 1.53!
in0.0479
.0565
.0602
.0699
.0720
.0205
.0831
.0894
.0931
.1023
.1042
.lm
.3.25
.2.34
.228
.150
.160
.176
.221
.2.66
.202
.216
.220
.222
.259
.264
.272
.278
.2a2
.205
.314
.327
.335
.340
.345
.348
.360
.377
.389
.403
.407
.43!4
.425
.439
.452
.466
.470
mximxa
32
In0.0514
.0622
.0635
.0737
.0753
.0045
.0865
.0929
.0%8
.1062
.lm9
.114
.129
.139
.142
.2s6
.164
.181
.266
.25’0
.207
.220
.224
.226
.265
.270
.277
.262
.266
.=9
.323
.332
.340
.345
.349
.352
.376
.384
.395
.407
.433
.422
.434
.446
.457
.470
.474
!4dna3 s!= in *adt.hreadsperird
1
.060%0as m. M30
.m~~ m. I-64
.07>72 or lb. 1-72
.086-56OK b. 2-56
.086+4or b. ‘N4
.03+48 or b. 3-48
.099-56orlb. ?-%
.2M-40 or m. 4-40
.3X4-48or m. 4-48
.125-40or m. HO
.32s-44or m. 5-44
.138-32or m. 6-32
.238-40or m. 6-40
.164-32or lb. +32
.164-36ox b. 6-36
.390-24Or b. lb24
.39C-32or h. 10-32
.216-24or h 12-24
.236-20.OZ m. P26
.236-32or m. 12-32
.350-m or 3/4-20
.230-200s 2/4-20
.25*32 or 3/4-32
.250-26or 2/4-36
3125-1Sor 5/36-323125-20or 5f16-2c3125-24or 5W243125-26or 5/16-2632Z5-32or 5/36-323125-36or V26-24
.375-16or 3/S16
.37>20 or 3/8-20
.37>24 Or 3/6-24
.375-20or 3/2-22
.37532 or 3/S32
.375-36or 3/S36
8375-140[ 7/3.6-141375-16or 7/36-16wrf-m or 7/26-20137s-22or 7/36-22137>32 m 7/M-32
50c-12or 2/2-12.50C-13or 3/2-13,500-16or 3/>16.Soo-m or 3/2-20.500-22or 3/2-28.50C-32m 2/2-32
See fcotnotesat end of table.
35
!1
~STEH28/2B
‘B&E 11A.+= kamx%x3ed txzhzsize limits tefore threadiq for diffezent krqths of engiqemnt, sbrdardUnified u-d safe UNS thzea&, chsses D and 2S (see 30.11 IJ - untinkd ●
Nminalsize in inchesFm5threads per inch
.5625-12 or 9/26-32
.5625-16 or 9/26-16
.5625-18 or 9/36-18
.5625-20 or 9/16-20
.562524 or 9/16-24
.5625+20 or 9/16-28
.5625-32 or 9/16-32
.625-u or 5/8-11
.625-12or 5/8-12
.625-16or 5/8-16
.625-3.8at 5/8-18
.625-20 or 5/8-20
.625-24 Or 5/8-24
.625-28 or 5/8-28
.6&32 or 5/8-32
.6875-12or
.6875-16 or
.6875-18 or
.687+20 or
.687+24 Or
.687528 or
.6875-32 or
.75C-1001 3/4-10
.750-12 or 3/4-12
.750-16 or 3/4-16
.750-18 or 3/4-18
.750-20 or 3/4-20
.750-28 or 3/4-28
.750-32 m 3/4-32
.875-9C: 7/8-9
.875-12or 7/8-12
.875-14 Or 7/0-14
.875-16 or 7/8-16
.P75-18 or 7/8-18
.875-20 or 7/B-20
.87S28 or 7/8-28
.875-32 os 7/8-32
.9375-12or 15/16-12
.937516or 15/16-16
.937>20 or 15/16-20
.9375-28 or 15/16-28
.937532 or 15/16-32
* fmtnotes at end
Seriesdesignatim
Incmmw
cmc3-2mN3am
w2.3U?16UNl.uw20026m2mN33U4
12UNlamm20UNK322F285S3mN
m127JNw?mw26UN3mN
3mN12UNus
..oNir2m3ZM
Luc12UNwMmmm261m32m
12L2+lamm2mN32UN
ale .
3
in.412.495.502.508.517.524.529
.527
.535
.557
.565
.571
.580
.566
.591
.597
.620
.627
.633
.642
.649
.654
.642
.660
.682
.690
.6%
.713
.716
.722
.745
.752
.75a
.774
.779
.755
.785
.758
.807
.815
.821
.836
.841
.847
.S70
.803
.e99
.?,]4
Fer03mYof
lhread
4
83.683.183.8e3.984.1e3.o82.5
83.083.183.083.183.183.184.183.8
83.6e3.183.883.984.1e3.o82.5
B3.183.183.883.1e3.184.183.B
83.6e3.183.8a3.983.0e2.5
e3.183.1e3.o93.883.1e3.184.1e3.8
e3.6e3.183.9e3.o82.5
.
2/Uaxiirmn
.4mw
.509
.525
.520
.527
.532
.536
.546
.553
.571
.578
.582
.590
.595
.599
.615
.634
.640
.645
.652
.657
.661
.663
.670
.6%
.703
.707
.7m
.724
.740
.759
.765
.770
.7e2
.786 .,
.778
.803
.814
.ezl
.828
.832
.845
.849
.865
.884
.e95
.907
.911
Percent.Yof
l?uead
6
67.o65.965.865.465.665.765.3
66.966.566.565.166.264.764.764.0
67.065.965.865.4 ●65.665.765.3
67.066.566.565.166.264.7M.o
67.o65.965.865.465.7 ‘65.3
67.266.565.766.565.166.?fd.164.0
67.065.965.465.765.3 ●
36
-s273-H28/2B
?S+?JZ11.A.3-- &mmenkd ble size lfmfts bebre thrediq for different lengths of erqqanent, sbdard---. .= Unified ad m IRS threaas, d855es D and 2S (see 30.1)1/ - mxmina.=. .
Reccmrer&d Ikzk size limits &r different h
Minilrm
7
in.472.495.502.508.517.524.529
.527
.535
.557
.565
.571
.580
.5s6
.591
.591
.620
.627
.633
.642
.649
.654
.642
.660
.682
.690
.696
.731
.116
.722
.745
.752
.7’58
.774
.179
.755
.785
.798
.807
.835
.821
.836
.842
.847
.870
.883
.899
.904
-
14axflmm
8
.a
.502
.509
.514
.522
.53s
.532
.536
.544
.564
.571
.5n
.5s5
.590
.595
.606
.627.
.634
.639
.647
.653
.657
.652
.6697
.689
.6%
.702
.716
.720
.731
.752
.759
.764
.778
.702
.766
.794
.806
.814
.823
.827
.840
.845
.856
.8n
.889
.903
.907
Abw 0.330till 0.67D
Hir.imm
9
in.4n.498.506.531.520.526.530
.532
.539
.562
.568
.574
.582
.5s8
.593
.6o2
.623
.630
.636
.645
.651
.655
.647
.664
.686
.693
.699
.7D
.72s
.727
.748
.756
.761
.n6
.780
.760
.789
.802
.ul
.810
.824
.838
.843
.852
.873
.BB6
.901
.905
Ma%h.m
10
fn.486.505.532.517.525.530.534
.541
.54B
.56S
.574
.5$0
.587
.593
.597
.62.3
.630
.637
.642
.650
.655
.659
.658
.673
.693
.699
.704
.72s
.722
.736
.755
.762
.767
.7s0
.7s4
.772
.79B
.B1O
.83,s
.824
.B30
.843
.B47
.861
.BSO
.S92
.905
.909
Ith of mgag.3Tent
AkNe o.6m till1.5D
u
in.4s2.502.509.514.522.526.532
.536
.544
.564
.571
.sn
.5B5
.590
.595
.606
.627
.634
.639
.647
.653
.657
.652
.669
.6B9
.696
.702
.716
.721
.731
.752
.759
.764
.778
.782
.766
.794
.806
.B14
.B21
.827
.840
.845
.856
.877
.BB9
.903
.907
3.2
in.490.509.53.5.520.527.532.536
.546
.553
.571
.57B
.502
.590
.595
.599
.61.5
.634
.640
.645
.652
.657
.663
.663
.676
.696
.703
.707
.720
.724
.746
.795
.765
.770
.782
.786
.778
.B03
.B14
.821
.828
.832
.845
.849
.865
.884
.095
.907
.911
tbina.1size fn inchesard thre&2s per inch
1
.5625-2.2or 9/26-22
.5625-16or 9/26-16 ““
.5625-2Bor 9/26-18
.562E-2oor 9/1+20
.562524or 9/M-24
.5625-26or 9/!lG2B
.5625-32m 9/16-32
.625-3.3or 5/B-31
.625-3.2or 5/6-12
.625-16 or 5/S-16
.625-18OK 5/S-lB
.625-20or 5/s-20
.625-24or 5/0-24
.625-2B or5/0-23
.625-32015/S-32
.750-10or 3/4-10
.750-12m 3/4-12
.750-16or 3/4-16
.750-2.sor 3/4-18
.750-20or 3/4-20
.750-2Sor 3/4-26
.750-32or 3/4-32
.B125-12or13/16-12
.6225-16or 13/16-16
.52.25-2.6or 13/26-3.8
.B3Z5-20or 13/26-20
.s325-2s or 1016-2B
.B2Z5-32 or 13/16-32
.87+9 0.?7/8-9
.87>12 or i’/B-l2
.B75-14 or 7/B-14
.875-16 os 7/8-16
.875-18 or 7/B-18
.875-20 or 7/s-20
.875-28 or 7/8-28
.87~32 OS 7/8-32
.937512m 3.5/16-12
.9375-16or 3.5/16-16
.9375-200235)26-20
.9375-26m 2s/26-20
.937532or 25/16-32
Ses fcotiotesat end of table.’37
i?EESTD-H28/2H
[email protected] ~ bk SiZ limitsbb:e threading br different lerqths of qpt, s-d3222ifie3a793-3x9th2’ea, ~ ls30Ya2E (see30.l)y-mtti.. -., ..-.
. ._- _>. .. ●3
W.run&
1
1.000-81.WC-U1.ML=141.-161.*231.-291.000-261.WO-22
1.12S-71.22581.125-221.223-161.125-2s1.123-20l.mia
1.267581.ls75121.387S-161.2237+2.01.1675-201.2B7>i$
1.332561.3125-121.317S-16!..3U5-181.3125-201.3223-in
1.3-1.375-61.37+131.375161.37+181.375a1.375-28
1.4315-6L.4375-81.h375-221.437+161.437>191.437+201.4375-20
1.5U-6l.sowe1.300-121.500-161.500-101.500-301.500-28
mlZM
14221wmm2mnl
wlM
Emol2a31
wmlm
if%
am
mlam161.31w2culZmm
mmmas2M342mm
Q.Nm+1224
=
2m14
lmc6m13w
Ll&$201J426W
3
.86S
.92a
.922
.932
.940
.966
.961
.966
.927
.972
.985
.9951.0021.0091.024
0.970.990
1.0231.0571.0651.0711.096
1.0s21.0973.2201.1271.2331.149
LR1.1601.1821.1901.1%1.232
1.1771.2221.2451.2521.2691.114
1.1951.2401.2831.3L771.32.51.37.21.334
dkza o
P&ma
&
4
83.183.163.083.083.183.184.183.8
03.4.83.683.583.183.883.983.0
83.s83.183.182.983.183.184.1
B3.483.683.183.883.983.0
83.583.183.183.683.183.184.1
83.483.683.183.803.903.0
82.183.183.183.083.183.184.1
E3.483.483.683.183.883.983.0
83.183.383.1a3.a83.183.164.1
5
.890
.93s
.92a
.946
.952
.957
.970
.974
.952
.9301.OCII1.0091.0231.0201.032
0.99B1.0351.0521.0711.0781.C821.095
1.077 ‘l.lls1.1241.1401.145l.m
1.2221.1401.1701.1%1.2031.2m1.220
1.2021.2401.2591.2651.2701.282
3.2231.2651.3031.32)1.3281.3331.343
1.Z81.3271.3651.3841.3901.3951.407
1.3S01.3901.4’231.4661.4531.4571.470
.%;66.365.965.865.465.7
68.467.766.5
6?:66.264.7-
68.167.065.965.865.465.7
60.4’67.766.566.s65.166.2.44.1
68.167.065.965.065.465.7
69.367.766.566.565.166.264.7
69.168.167.065.965.065.465.7
69.367.764.566.565.166.244.1
See fczhotes at end of tihle.38
- 11.A.3- Rxxxmended ble size lSmits kfore threadfng for difEerent leqtb of erq6g@m?nt, stamkxdUnified ti sme UKi threti, classes 3B and = (.93.330.1) 3J - .xzztimzd
● ‘~ b2s aim lkks fordiftermt kq?im of ~t;.
m ad inchdiq (1.3D
●
14inlmn
.865..910.923.932.940.946.962.944
.927
.972
.903
.9931.002l.om1.024
0.970.990
1.03s1.0371.0651.0721.066
1.0321.0971.1201.2271.3311.149
1.0951.2.251.3401,,+221.2901.1961.231
1.1771.2221.245J.2521.2581.274
1.1951.240l.im1.3071.3351.3231.336
1.2571.3021,3471.3701.3771.3031.399
1.3ZI1.3651.4101.4321.4401.4461.461
Seef
Kaxim3a
8
.877
.939
.932
.939
.946
.9S2
.9+6
.9m
.940
.901
.9931.0021.0091.0141.02a
0.9841.0021.0441.CU1.0711.077L090
1.261.1061.2271.U41.2391.M3
1.1091.1271.1691.1091.2961.2021.22.6
1.1991.2331.2521.2591.2641.275
1.2301.2s21.2W1.3141.3321.3271.340
1.2721.32s1.3561.3771.3841.3891.403
1.3351.3771.4291.4391.4461.4521.666
notes
Mvvc 0.3m thru0.67D
.871
.914
.927
.936
.943
.9i9
.%3
.94a
.926
.9n
.909
.9981.W61.0231.026
0.977
1:%1.0411.0661.0741.0s8
1.0$91.1021.2231.2301.1361.231
1.3021.ul1.164L 2661.2931.1991.223
1.1841.2271.24S1.2361.2611.276
1.m21.2461.’209L3231.3301.3241.338
1.2651.3oa1.3521.3731.2601.3861.401
1.3271.3711.4141.4261.4431.4491.463
end of
6baimm
M
.804
.923
.934
.943
.949
.954
.96E
.972
.946
.9S6
.?971.m31.0321.0171.OXI
0.9911.00B1.0481.0661.074l.ozn1.093
1.071
tE1.1371.1421.355
1.1161.3341.1731.3931.1992.2041.220
1.L961.2%L2351.3621.2671.200
1.2291.2301.29s1.3261.3241.33S1.343
1.-2801.3211.361l.zao1.3871.392L.405
1.3431.3S41.4221.4431.4491.4561.466
P&W 0.6792tuul.m
~b
u
.8n
.929
.931
.939
.946
.9S2
.%6
.970
.940
.981
.9931.M21.0041.0141.028
0.9641.0021.0441.0641.0711.0771.090
1.0651.2061.1271.1341.1391.233
1.1091.1271.1691.1891.2961.m21.216
1.2901.2311.2521.2391.2641.278
1.2201.2521.2941.3141.3211.3271.340
1.2721.3231.3561.3771.3841.3891.403
1.3351.3771.4291.4391.4461.4521.466
able.39
12
.890
.929
.92a
.944
.9s3
.957
.9m
.974
.962
.9901.0031.0091.0231.0201.032
0.9961.0351.0531.0711.0761.0221.09s
1.077
::s1.1401.1451.357
1.3231.1401.1-681.3961.2031.2071.2m
1.m21.2401.2591.2651.2701.2E2
1.2251.2651.3031.3211.3.291.3321.365
1.2881.3271.3651.3841.3901.3951.407
1.3301.3901.4201.4461.4s31.4571.470
F3%D-STD-H28/2B
1
1.000-s1.000-121.00C-141.000-26L.mu1.O*2Ol.oocl-z1.029-32
1.0625-41.0625-321.06zr141.0625-161.06S361.oa5-iQ1.0625-26
1.12.5+9
1.250-71.250-61.250-121.25*161.2s2-201.2s0-201.25C-2E
1.375-41.37S-81.37s-121.275-361.375-381.27s-m1.27S-2E
1.4275-61.4375-61.4375-121.4375-161.4s73-281.4375-2U1.4m528
1.50C-61.500-81.300-121.500-161.500-lB1.5oo-m1.500-26
- IIA.3- ~ tie sizeliaitsbsfnrethrediqh differentJxqthsof~:, s.-Mif+edald 6uIlew4hreadS, c38sses 231am53s(see30.1)lJ-amtinw2~.
m
Nmina2iai zefnfnctrsal’dthreadsperincb
1
1.5625-61.5625-81.5625-221.5625-161.5625-3S1.5625-20
1.625-61.625-81.625-321.625-161.625-M1.62S-20
1.6875-61.687>81.6s75-121.6S75-161.6s75-3s1.6675-20
1.750-51.75f+61.750-81.750-121.75C-161.750-20
1.62.25-61.U25-8l:ux-lz1.8125-161.822s-20
1.87S-61.87581.875121.875161.875-20
1.9375-61.9375-81.9373-U1.9375161.9375-20
2.000-4.52.000-62.000-82.000-122.000-162.OW-20
WIesdesignatim
2
m?mlzwm2t4m
SJNm1224Mmmm2om4
mN
liutl1s2!4-20UN
mmSLm
lammn4
64E4mmmMm2om
tm4mDmla20UN
6m4WNMN161n420UN
m60N8ot4
H
Mm? diam?teto]
3
M
1.3821.4271.4721.4951.s021.s08
1.4451.4901..s351.5571.5651.571
1.5071.5521.s971.620”1.6271.633
1.5341.5701.6331.6601.6821.696
1.6321.6771.7221.7451.759
1.6951.7401.7851.807l.szl
1.757l.aoz1.8471.8701.883
1.759Lam1.8651.9101.9321.946
4
83.483.483.683.183.sS3.9
83.183.183.183.883.163.1
83.4S3.483.683.183.8S3.9
83.1
E::83.183.883.1
83.483.483.683.183.9
S3.183.1
w83.1
83.4S3.483.683.183.9
83.583.183.1S3.183.883.1.
,terraltb
2/Haxim.m
5
fn
“1.4231.4521.4901.5091.52s1.520
1.47s1.52.s1.5531.5711.5781.5S2
1.53s1.5n1.6351.6341.6401.64s
1.56s1.6001.6401.6781.6961.707
1.6631.7021.7401.7591.7m
1.72s1.7651.s031.8211.832
1.7881.8271.8651.8841.895
1.7951.8501.BSO1.92s1.9461.9s7
s
I%m2el#of
‘nueFd
6
69.166.1 -67.065.965.865.4
69.367.766.566.565.166.2
69.1
67:;65.965.865.4 ●70.169.367.766.566.566.2
69.16s.167.065.965.4
69.367.766.566.566.2
69.168.1 ,67.065.965.4
* fmtnotes at end of tible.40
3’Ec-s213-E28/213msl.z11.A.3- ~ Imle size limits &tire threading for different leqths of eqeqenent, st.addrd
Lh-llfied-- LW threads, c2a59e9 2s and m (see 30.1) y - atillu33
----P f bok eim Mmitsztirdifferentlength of engagent...s
2b &d incluihg o.33n
1.3821.4271.4721.49s1.s021.s09
1.445I 1.490
1.535l.sn1.5651.571
1.5071.S521.5971.6201.6271.633
1.5341.5701.6U1.6601.6021.696
1.6321.6771.7221.7451.758
1.69S1.740I.78s1.807l.ml
1.7571.8021.8471.8701.883
1.7591.S2U1.86s1.9101.9321.946
1.3971.440L 4811.s021.5091.s14
1.4601.5021.5441.5641.5711.577
1.5221.S651.6061.6271.6341.639
1.S501.ss51.6271.6691.6s91.702
1.6471.6901.7311.7521.764
1.7101.7521.7941.8141.827
1.n21.s351.E561.8771.8s9
1.7771.8351.8771.919
I 1.9391.952
1
Atove 0.330 thru 0.67D
in
1.3901.4341. 4n1.4981. S061.531
1. 4s21.4%1.5391.s61l.sa1.574
3.5351.558L 6021.6231.6301.636
1.s42~.sn1.6211.6641.6861.699
1.6401.6841.7271.7481.761
1.7021.7461.7891.8221.824
L 765l.wa1.8s21.8731.s.86
1.7681.8271.8711.9141.9361.949
in
1.40s1.4461.4861.s051.53.21.517
1.4601.5081.S481.5631.5741.ss0
1.5301.5711.6311.6301.6371.642
1.S591.s93.1.6341.6731.6931.704
1.6551.6961.7361.7551.767
1.72E1.7501.79B1.8181.830
1.7801.8211.8611.B801.892
1.7861.0431.B841.9231.9431.954
AtUW 0.67Dthnl1.5D
IF14inimun2.3
in
1.3971.440L 4011.5021.s091.514
1.4601.s021.s441.s641.5711.577
1;5221.56S1.6061.6?)1.6341.639
1.5s01.5s51.6271.6691.6891.702
1.6471.6901.7311.7521.764
1.710L7521.794“1.8141.827
1.7721.8351.8561.8n1.8s9
1.7771.8351.8771.9291.9391.952
22
.fn
1.4231.4521.4901.5091.5251.520
1.4751.5251.5531.5711.578l.saz
1.s38I.sn1.6251.6341.6401.645
::%1.6401.6781.6961.707
1.6631.7021.7401.7591.770
1.72s1.7651.8031.WU1.832
1.7881.8271.8651.8841.s95
1.7951.8s01.8901.9281.9461.9s7
Nminel size in inches
Flt-f3thmadsprincb
1
1.S625-61. S625-81. S625-221.s625-161. S625-181.562S-20
1.625-61.625-B1.625-121.62+161.62S-181.62S-20
1.687Fr61.687S-81.6875121.6875-161.6875-181.607s-20
1.750-51.7s&61.750-8Z.750-121.750-161.750-20
1.812s-61.RU5-S1.8125-221.0U5-161.8125-20
1.87M1.875-81.875-121.87S-161.87520
1.9375-61.9375-81.9375-121.9375161.937>20
2.00C-4.52.000-62.000-82.00C+122.000-162.000-20
See faJtnotesat em3 of table.41
Ew-s’Iwz28/a
.=,
2%BtZ 11.i3 ;-.~●
lmle size MmLts bebce thswding for different lerqths of eq&&nt, star&JKdUnified and mre W thretds, C- f.flad m (sse 30.1) ~ . -&*
~simininches?lrdthre.adsperirch
2.062!+16
2.125+2.U+62.225-122.3.25-162.225-20
2.3E75-16
2.250-4.s2.250-6
2.5C4)-42.%3.000-43.250-4
kMi
sxiesdes igmatim Mi.nimm
=lF2 3
in
1.995
ml 1.945mm 1.990
2.03516U4 2.057XKR4 2.071
lx 2.la3
w 2.009Sam 2.om
Um 2.229WC 2.479m 2.729
2.979
See botmtes at E-X3of table.
I
II
I
I
42
4
83.1
83.183.183.183.883.1
83.1
83.583.1
:::83.483.4
5
in
2.0U3
1.9752.02s2.o532.0712.082
2.334
2.0452.100
2.2672.5172.7673.017
Ikmentv
&6
65.9
69.367.766.566.566.2
65.9
71.069.3
71.771.771.771.7 ●
L
FE23-STD-I?28/2B
~ bale siza 3.fmiteti different L
m ard fm2h251ng0.330IIAbve 0.3m thfu 0.67D
6uldms0
7
in
1.995
1.945.1.9902.0352.0372.072
2.320
2.0092.070
2.22s2.479
●2.?392.979
%
M82icd0nfniam
8 9
in fn
2.002 1.998
1.960 1.9522.002 1.9962.044 .2.0392.064 2.0612.077 2.074
2.227 2.322
2.027 2.03.82.065 2.077
2.240 2.239.2.498 2.4a92.748 2.7392.998 2.989
Mlxilmm
10
in
2.005
1.96E2.0082.0482.0602.060
2.230
2.0362.093
2.254 ‘-2.5082.7563.008
Nfnf2mn
2-3
in
2.002
1.%02.0022.0442.0642.077
2.127
2.0272.085
2.2402.4982.7462.998
23
h
2.009
1.9752.0252.0532.071Z.C&?
2.334
2.04s2.100
2.202.5172.7673.017
.-. . ––—
!kmfnalaizef.ntiLudthretdspximll
1
2.0625-16
2.3.25-42.=82.125-122.323-16’2.12?+
2.3S7%16
2.250-4.s2.250-6
2.300-42.750-43.oco-43.=0-4
~ ~~yg be.- limits.e qud m tb Anc.r dimcu~ tdermxs Liu3mgth90fIbever, * minikam v83ues -r lengths of
=Jw==t-~aqagewmt gredter than 0.33nin Sims 0.25 in.
and hrgez &e &!smd w that th! difference &been lfmfm Is _ less b 0.0040 h. ror dimce--piti &inaticzm ot.br tbm tlcee given in this mk.2e, am 30.2.
Zble nize limits &a dimcet.ec-piti ccmbfnatims which * -t ~ fn this W my k *-- M M Ofdun in this @da prcdded them is a diareter~imh ux&dnatim fn ths tabki(1) b-itht6=cuImpimbm3(2) with~ dtik thatislessty m fntegm2tmnmt &m tb dfmrebr+ti carhna“ tfm fm which ka3e sizs
vabm aze &sized, 0211S:Values In * table fur mninn3 sizes 2ess ttmn 0.25 in. c9m0t be used farthis pq2192. )
E2P2KlW lb cbtain * values for * 4.0*S2E or = thread, ad 2.000 b n2WS &r * 2.000-5NUueadslxamh t!mtahle. ‘17)esavalue.quuld thm ~: 3.865, 3.877, 3.871, 3.B84, 3.877,3.890. m PCrmlas of thread Wu.2 Zemfn Imchmlpea.
2J B.mA cm.Ue2. . randed off in tke prhirq .lum. 100 perumt of threzd - 0.791 [see 30.2.3).
lJ0asedonak@hofwwtqa3 tntlt?mmdrtal ditureter.
43
FED-ST13-H28/29
7mmE 11.?+.4- ~EX7 Imlesizelimitsbeforethreadiq h differentkqtb of mgagment, st.ardOnifiedd s=e W tbreds, * 3B [see30.1)~
I
“a
9
?linordiambx of inte~ ~e
Y
II 1
I .060-8001lb. 0-80
.073-64 or N2. 1-64
.073-72or tb. 1-72
.086-56or No. 2-56
.086-64or No. 2-64
.099-48or M. 348
.099-56or lb. 3-56
.122-40or b 4-40
.3X+48 or M. 4-48
.125-40or m. 5-40
.12544 or W. 544
.13S-32or b. 6-32
.138-40or No. 6-40
.164-32or M. %32
.164-36 or W. 8-36
.2.90-24or No. 10-24
.290-32or N& 10-32
.216-24or M. 1%24
.216-28 or NU. 12-2a
.216-32 or M. 12-32
.25C-20
.250-28
.250-32
.25C-36
.3125-M
.3125-20
.312524
.3125-28
.312>32
.3125-36
.375-16
.37>20
.375-24
.375-28
.375-32
.375-36
.4375-14
.437>16
.4375-20
*r iesIesignatim
.431!+28
.4373-32
* fwb-des at d of tah3e.
trw
Lrc
OKm
IRKm?
UKUm
m02-F
w
LwUNF
w
WLowm
UKInfFOtEfw
o-m2UIN
2671Nmm
‘K20UNUNF2euNIilJmm
m16UN
m327RJ
3
in0.0465
.0561
.0580
.0667
.0691
.0764
.0797
.0849
.0894
.0979
.1004
.1040
.Ulo
.3300
.3.340
.1450
.3S60
.1710
.1770
.1820
.1960
.2110
.2160
.2200
.2520
.2580
.2670
.2740
.2790
.2820
.3070
.3210
.3300
.3360
.3410
.3450
,3600.3700.3830.3990.4040
44
FercentYof
Thread
4
83.1
83.383.1
S3.283.3
83.583.2
83.483.5
83.483.3
83.883.1
83.883.1
83.183.8
83.184.183.8
03.184.183.883.1
83.883.984.183.082.584.5
.93.e83.183.184.183.883.1
83,583.183.983.082.5
taxim.m
5
0:514
.0623
.0635
.0737
.0733
.0845
.0865
.0939
.0968
.1062
.1079
.2240
.12E6
.1389
.1416
.3.55s
.1643
.1807
.M57
.1895
.2190
.7.229
.2258
.2630
.26E0
.2754
.28o7
.2847
.2877
.3182
.3297
.3372
.3426
.3469
.3501
.3717
.3800
.3916
.4051
.4094
Per02ntY
of‘1’nread
6
53.0
53.052.7
53.653.9
55.756.2
57.957.9
59.159.7
62.862.1
●63.763.8
65.265.365.3
66.766.866.8m.1
68.6
::;68.5 ,68.5 ,.66.7
70.069.769.069.869.269.0
70.970.870.769.8 “o69.2
FED-S2D-H28/2B
m15LE 11.A.4- ~ed tde sizelimi= tefore threading for different lengths of eqag-t, sbdard
unified ard 6are IN *e&, ck 3B (see 30.1) y - amtinued.-.
--Wmmm5ed bsle size limits for different length$ of aqagenent
m a-d fnchdij-lg13.33D
~ti
7
0.g65
..0561.0580
.0667
.0691
.0764
.0797
.0849
.0894
.0979
.1004
.1040
.Ulo
.2300
.1340
.1450
.2560
.1710
.1770
.1820
.1960
.2110
.2160
.2200
.2520
.2500
.2670
.2740
.2790
.2E20
.3070
.3210
.3300
.3360
.3410
.3450
.3600
.3700
.3830
.3990
.4040
W.%ium
8
~
0.0500
.0599
.062.3
.0705
.0724
.0804
.0831
.0894
.0931
.lom
.1041
.1091
.3.348
.3.345
.1371
.3.502
.1601
.1756
.183.5
.185a
.2013
.2352
.2196
.2223
.2577
.2632
.2714
.277’2
.2817
.2E50
.3127
.3253
.3336
.3395
.3441
.3475
.3660
.3749
.3875
.40m
.4066
W 0.33Dth?uo.6m
9
~
0.0479
.0580
.0596
.0686
.0707
.0785
.0814
.0871
.093.2
.1000
.1023
.1066
.2128
.1324
.1359
.1475
.3.582
.1733
.1794
.1043
.1986
.2131
.2172
.2203
.2551
.2600
.2694
.2749
.2792
.2823
.3101
.3231
.3314
.3370
.3415
.3450
.3630
.3723
.3855
.3995
.4040
10
~
0.0514
.0618
.0629
.0724
.0740
.0825
.0848
.0916
.0949
.1o41
.1060
.3M5
.3.267
.1367
.1397
.1520
.1623
.1782
.1836
.1877
.2040
.2171
.2212
.2243
.2604
.2656
.2734
.2789
.2832
.2863
.3155
.3275
.3354
.3410
.3455
.3490
.3688
.3774
.3896
.4035
.4080
Abve 0.67Dthcu1.5D
u
~
0.0479
.0505
.0602
.0699
.0720
.0805
.0831
.0894
.0931
.1022
.1042
.1091
.1147
.1346
.1378
.1502
.1602
.1758
.181S
.1859
.2013
.2250
.2189
.223.9
.2577
.2632
.2714
.2767
.2807
.2837
.3128
.329
.3332
.33S6
.3429
.3461
.3659
.3749
.3B75
.403.I
.4054
Mxiumn
32
0.214
.0623
.0635
.0737
.0753
.0845
.0865
.0939
.0968
.1062
.1079
.1140
.2186
.1389
.1416
.2555
.1641
.1807
.1857
.1095
.2067
.2190
.2229
.225a
.2630
.2680
.2754
.2807
.2047
.2877
.3182
.3297
.3372
.3426
.3469
.3501
.3717
.3800
.3916
.4051
.4094
..
txnfm.1size in incksardt&ead6periJlctl
1
.062-s0or lb. 0-80
.073-64or tb. 1-64
.073-72or tb. 1-72
.096-56or W.. 2-56
.086-64or w. 2-64
.099-48 or &a. 3-48
.099-56 or W. >56
.2X+40 or M. 4-40
.3.32-4.9or f&. 4-48
.125+0 or W. 5-40
.225-44 or m. -4
.13S32 or b. 6-32
.238-40 or No. 640
.164-32 or N% S32
.164-36 or tb. 6-36
.39*24 or No. 10-24
.190-32 or W. 10-32
.2M-24 or tb. 1>24
.216-28 Oc W.. 12-28
.216-32 or W. 12-32
.250-20
.250-28
.25*32
.250-36
.33.2518
.3125-20
.33.25-24
.312528
.3125-32
.3125-36
.375-16
.375-20
.375-24
.375-28
.375-32
.315-36
.4375-14
.4375-16
.4375-20
.4375-28
.4375-32
See foomotes at eti of table.
45
FE&STD-H28/2B
*5 iesdesiccation
‘3m3L211.A.4- Wc$mmcm2& hzle size limits before fhrezdirqfor differentlqtba of eqqemsnt, starctardOnified ad s.ne 11+3ttuewfs, ck15 ~ (66230.1)~ . ~~~
.- -..: ...
Ninor diaseterof internrdrim
NOniml size in incks —7Percenaad threadspm M of
17xecd
1
.500-32
.500-13
.500-16
.500-20
.500-26
.500-32
.5625-32
.5625-16
.5625-2B
.5625-20
.562524
.5625-28
.S62532
.625-11
.625-12
.625-16
.625-36
.625-20
.625-24
.625-28
.62532
.6s75-12
.6K7516
.6875-18
.6075m
.6675-24
.6675-28
.4875-32
.750-10
.750-12
.750-16
.750-18
.750-20
.750-28
.750-32
.8U5-12
.s125-16
.8125-18
.w+rn
.8125-28
.8125-32
.875-9
.875-12
.875-14
.87+16
.875-18
.875-20
.875-28
.875-32
.9375-12
.9375-16
.9375m
.93-H-2a
.9375-32
2
0?swlam
3aN
Lx12LXlam
32LN
lm
Zm331m
m120NU6PIRSm
16xmmw2m3am
iocU&Nw16m13f65
2WN3212.’
lam
2olN32m
See fa.tnotis at d of table.
3
~
.4100
.4170
.43m
.4460
.4620
.4660
.4720
.49s0
.5020
.5080
.5170
.5240
.5290
.5270
.5350
.5570
.5650
.5710
.5BO0
.586o
.5910
.5970
.6200
.627o
.6330
.6422
.6490
.6540
.64m
.6600
.6Bm
.6900
.6960
.73.30
.7160
.72m
.7430
.75m
.75m
.7740
.7790
.7550
.7850
.7980
.8070
.0150
.8210
.836o
.8410
.8470
.8700
.8630
.8990
.9040
46
4
83.183.183.B83.184.103.8
83.683.183.883.964.183.082.5
03.083.183.8B3.I83.1B3.1B4.1B3.8
83.6B3.183.083.924.183.082.5
B3.1E3.183a83.183.154.183.6
83.683.183.8B3.983.082.5
E3.1B3.183.083.863.183.104.183.8
83.6B3.1B3.983.002.5
naximm
5
in
.4223
.4264
.4434
.4537
.4676
.4719
.4843
.5040
.5106
.5162
.5244
.5301
.5344
.5391
.5463
.5662
.5730
.5787
.5269
.5926
.5969
.6085
.62S4
.6355
.6412
.6494
.655J .
.6594
.6545
.6707
.6900
.69S0
.7037
.7176
.7229
.7329
.7533
.7605
.7662
.7801
.7844
.7681
.7952
.8068
.815B
.8230
.8207
.8426
.8469
.8575
.8783
.8912
.9051
.9094
6
71.871.171.671.369.069.2
72.272.171.971.370.469.869.2
72.772.772.472.171.370.469.849.2
13.012.872.171.370.469.B69.2
13.573.372.972.171.369.869.2
73.572.972.171.369.869.2 ,
74.173.773.572.972.171.369.069.2
73.972.971.369.869.2
2?IB2.E11.A.4- ~ lde size limits tefnre thseadiq fnr different Zerqths of e!qqe7rent, stzdardUoified ad sme M *e*, * 3B (= 30.11 ~ - afi~
in.4100.42m.43m.4460.4610.4660
.47m
.4950
.som
.5080
.5170
.5240
.5290
.5270
.5350
.5570
.5650
.5710
.5800
.5660
.5910
0 .5970.62oo.6270.633o.6420.6490.6540
.6420
.66oo
.6820
.6900
.6960
.7230
.7160
.722o
.7450
.757fJ,7580.7740.7790
.7550
.7850
.7980
.8070
.8150
.B21O
.12.360
.8410
.8470
a
.8700
.8830
.0990
.9040
* 0.33D
----
._n=+-@=o Im2e size limits 20? different h
mamlti
mximm
8
511.4161.4225.4371.4498.4645.4691
.4783
.4994
.5065
.5123
.5209
.5270
.5316
.5328
.5406
.5617
.569o
.5748
.5834
.5895
.5942
.60~
.6241
.633s
.6373
.6459
.6520
.6566
.6481
.6652
.4866
.6940
.6998
.7145
.7191
.7276
.7491
.7565
.7623
.n70
.7816
.7614
.7900.8022,8116.B190.8248.8395.8441
.8524
.8741
.8973
.9020
.9066
Ak& 0.33Dthru0.670
‘Junimm
9
~
.U29
.41%
.4347
.4477
.4620
.4665
.4753
.49n
.5043
.5102
.5186
.5245
.5290
.5298
.5377
.55%
.5669
.5727
.5622
.5670
.59L5
.6001
.6219
.6294
.6352
.6436
.6495
.6540
.6449
.6626
.6644
.6929
.69n
.712U
.7165
.7254
.nii
.7602
.7745
.n90
.7580
.7874
.8000
.8094
.8169
.8227
.8370
.0425
.0699
.8739
.8852,8995.9040
10
~
.4192
.4234
.4395
.4517
.4660
.4705
.4813
.5017
.5066
.5142
.5226
.5285
.5330
.5360
.5435
.5640
.5710
.S167
.5651
.5910
.5955
.6057
.6262
.6335
.6392
.6476
.6535
.6580
.6513
.6680
.6887
.6960
.7017
.7160
.7205
.7303
.7512
.7585
.7642
.7785
.7830
.7647
.?926
.8045
.8137
.8230
.8267
.8410
.8455
.8550
.8762
.0892
.9035
.9080
h of engagmt II ‘“
~
.4160
.4226
.4371
.4497
.4636
.4679
.4703
.4994
.W65
.5122
.5204
.5261
.5304
.5329
.5405
.5430
.5609
.5747
.5629
.5806
.s929
.6029
.62U
.6314
.6372
.6454
.6523
.6554
.6481
.6653
.6065
.6939
.6997
.n36
.7179
.7276
.7490
.7564
.7622
.7761
.7804
.7614
.7900
.8o23
.6135
.8189
.8247,8306.8429
.0521
.8740
.8872
.90U
.9054
9[ ]~
.4223
.4284
.4419
.4537
.4676
.4724
.4043
.5040
.5106
.5162
.5244
.5301
.5344
.5391.5463.5662.5730.5787.5869.5926.5969
.608S
.6264
.6355
.6412
.6494
.6551
.6594
.654s
.6707
.6908
.6980
.7037
.7176
.722.9
.7329
.7533
.76o5
.7662
.-2801
.7044
.7681
.7952
.8068
.8156
.8230
.8287
.8426
.8469
.8575
.8783
.8932
.9051
.9094
.50C-12
.500-13
.500-16
.500-20
.500-2E
.500-32
.5625-3.i
.5625-16
.5625-18
.5625-2o
.562>24
.5625-24
.5625-32
.625-11
.625-12
.625-16 #
.625-18
.62520
.625-24
.625-28
.625-32
.687+12
.6875-16
.6e73-le
.687520
.687>24
.6875-28
.~7>32
.750-10
.75C-12
.750-16
.75C-18
.75C-20
.750-22
.750-32
.622512
.8225-16
.222518
.8225-20
.8225-28
.W25-32
.875-9
.875-12
.875-14
.875-16
.875-18
.875-20
.875-20
.875-32
.9375-12
.9375-16
.9375-20
.9375-28
.937+32
—
47
lSi3U?11.A.4- 3@mmemW Me sizeM&its bzforethreadfrqfordifferentlerqthzof qagemmt, scacdacd.Mfied md ~ ~ t32re2&,chzss33 (see30.1)IJ - -~~,. -
z. ... ●s
Wdl-la3 size In inchesaldtlu.xrMper&ch
1
1.000-8l.om-lz1.000-141.00U-16I.me-u1.Ore-20l.mo-a1.OCC-32
1.0426-01.0632?-221.0623-141.0623-16L.0625-261.062!+201.06.2!+26
1.225-71.123-s1.325-321.12S-161.US-1a1.12.%241.226-28
1.2.S7H1.2s73-121.167>161.1876-161.367s-m1.1873-26
1.350-71.LE.O-8l.mu1.250-16I.nc-in1.250-201.250-26
1.3226-81.3326-321.3225-161.3123-241.3125-201.3323-26
1.37+61.373-81.376-121.373-161.373-181.375-201.373-28
i.4373-61,4315-81.4373-121.4375-161.4373-381.4376-m1.4376-20
see fwbwtes at erd
5sriesLkignrttim
2
wLP2FmlWN
UmP2mJam
mlmlaw2um
mcamLQrlRNmm’
2m
maammlKNUNm‘3uLN2m7N
amUz31lQ.7NmmZfxm2MN
tie.
Hirnrdimreterof internaltk.s
3
.8650
.9100
.9230
.9320
.940d
.9460
.9610
.9660
.9370
.97m
.9850
.9950loom1. Oow1.0240
1.0320:.09701.12001.12701.13301.1490
1.09501.11501.16001.18m1.19001.19601.2110
1.17703.22m1.24501.25201.25281.2740
1.39s01.24001.28501.30701.31601.32101.3360
1.25’701.30201.34701.37001.37701.38301.3990
Fwca-.&of
‘nuerd
4
83.183.183.083.B83.103.1S4.183.8
63.483.683.583.183.B03.983.0
e3.583.183.183.8e3.183.184.1
83.483.683.163.s83.983.0
83.563.183.183.803.123.184.1
a3.483.683.103.883.903.0
83.183.163.183,883.163.184.1
83.483.403.683.103.683.983.0
2/16ZL131US
5
in
.E797
.9198
.9335
.9400
.9600
.9531
.9676
.97L9
.9623
.9823
.99401.00331.01051.01621.0303
1.06721.10731.12S31.13551.1U21.E51
1.31251.12971.169S1.190s1.39801.m371.2176
1.3.9221.23231.25331.2KD51.26621.2801
1.23461.25471.29481.315=91.32301.32s71.3426
1.27711.31721.35731.37031.28551.39121.4051
FerQntYof
nued
6
74.174.173.872.972.171.369.869.2
7d.174.173.872.972.171.369.8
-34.174.114.L12.972.171.369.8
74.1?4.172.9
%:69.8
14.174.114.172.972.171.369.8
74.174.172.972.171.369.S
74.174.174.172.972.171.369.6
74.114.114.172.972.171.369.6
48
22!&E 11.A.4 ; ~ tule Size limits befnre thre.dq @r different kqti of engqeuent, stardard13nifiedad snm W thzezdz, c3dss 3 (3ee 30.1) lJ - m~~
Iule size Ltiits for differentk
m d Inclldlng0.320
Mnimm mximm
~ of~t
AtOw o.6m tflc”1.50
, .,
bird size in fnchesard threadsPL?ri.mh
)JDve 0.330 thru 0.670
Rlnim.m Faxham !linimm
32
.8%.
.9148
.9271
.9365
.9439
.9497
.9636
.9679
.9347
.9773
.9896
.99901.00641.01231.0261
0.9789.9972
1.03981.06251.06891.07471.0886
1.05971.10231.32401.33141.13721.2.5U
L.10391.12221.164s1.3S651.19391.39971.2136
1.18471.22731.24901.25641.26221.n61
1.20461.24721.289S1.31331.3M91.32471.33B6
1.26713.30971.35231.37401.38141.3872:.4011
mximm
12
.8:7
.919B
.9335
.9408
.9400
.9537
.9676
.9729
7 8
.0s2
.9148
.9271
.9366
.9440
.9498
.9645
.9691
.9347
.9773
.9B96
.99911.00651.01231.0270
0.9790.9972
1.03981.06161.06901.07481.0095
1.05971.10231.12U1.33331.13731.2.520
1.10401.12221.16481.3.s661.39401.:9981.2345
1.10471.22731.24911.2S651.26231.m70
1.20461.24721.20981.33.361.31901.32481.3395
1.26711.30971.35231.37411.38s1.38731.4030
9
.8:4
.9123
.9269
.9344
.9U9
.9477
.9620
.9665
.9309
.9748
.9874
.99651.00441.01021.0245
0.9747.9934
1.03731.05941.06691.07271.CS70
1.05591.09981.12291.12941.33521.1495
1.09971.32841.16231.le441.19291.19771.2120
1.18091.22481.24691.25441.26021.3745
1.19961.24341.28731.30941.31691.32371.3170
1.26221.30591.34901.37191.37941.38521.3995
10
fn.8759.9173.9293.9387.9460.9517.9660.9705
1
.8:0
.9100
.9220
.9320
.94M
.9460
.9610
.966o
.9270
.97m
.9850
.99501.00201.00201.0240
1.00+81.000-121.00W141.00v-161.OM-lS1.000-201.OW-261.000-12
1.0S5-91.062S-121.0435-141.0625161.0635-181.0625-201.0625-28
1.125-71.32581.125121.225161.125-3.6,1.125-201.133-28
.9364
.9798
.99181.00121.00851.01421.02$25
.9422
.9833
.99401.00331.01051.01621.0301
0.9700.9900
1.03501.05701.06501.07101.0860
0.98331.00091.04231.CK371.07101.07671.0910
0.90751.00471.04481.06581.07301.07871.0926
1.06341.10481.1i521.13331.13921.3.335
1.10831.12391.16731.18871.19601.20171.2160
1.06721.10731.13431.13551.14121.2551
1.1875s1.3675-121.1875161.2272-321.1075-201.3.87+28
1.22251.1W71.16981.19081.19801.20371.2176
1.250-71.250-01.25C-121.350-161.2X-181.250-201.250-28
l.lno1.22201.24501.2520
1.18841.22981.25221.25851,26421.2785
1.29221.23231.25331.26051.26621.2801
1.3125-81.31>121.3125161.31~25-le1.3125201.3135-28
1.2ss01.2740
1.20961.25091.29231.31371.37.:01,32671.3410
1,27211.31341.35481.37621.38351.30921,4035
1.21461.25471.29481.31581.32301.32871.3426
1.375-61.373-81.375-121.375161.375-181.375-201.375-28
1.19501.24001.285o1.30701.31501.32101.3360
I 1,25701.30201.3470
I 1.37001.3770
e
1.30301.3990
:.27711.31721.35731.37831.38551.39121.4051
1.4375-61.4375-E1.437+121.4375-161.4375-181,4375-201.4375-28
See fcotmtes at end of *e.
49
I
FED-S’IWH2i3/Z3
‘27WLE11.A.4 - maurendd Imle size limits &fore thretiimg for different lerqths of erqagecent, stamdrdUnified UX5 scue m thmaka, * 38 (.80230.1) ~ . ~tin~
.- -.
.=. . ..
nternd thred3
fAmina3sizo b, LtisC.n5threadspesindl
1.5470-61.500-81.50C-321.500-161.600-281.50C-201.50C-28
1.5635-61.5625-61.5625-121.5625-161.5625-181.5625-20
1.625-61.625-81.625-131.623-161.625-181.625-3Q
1.6875-61.6875-81.6875-111.6875-161.6875181.6875-20
1.75C-51.750-61.75C-81.750-121.750-161.750-20
1.B125-61.8125-81.Lu26-121.8125-161.8125-20
1.m25-d1.6325-61.8125-221.6225-161.0225-20
1.9375-61.9375-01.9375-121.9375-161.9375-20
2.00C-4.52.000-62.MO-82.000-122.000-162.000-20
%, iesdesignatim
2
oxW8IO@16WNm
m
m&mlmlllaIn&P2L2m
UC
m12LNlam2LI.54
ml
13W+lam
L%mmlam2ow4
mmmlamlam201M
2.0623-16
Se8 fcotnotes at ez-dof talzk.
w
~
1.32001.36S01.62001.43201.44001.44601.4610
1.38201.42m1.47m1. 49s0l.zom1.5080
1.44;01.49001.53501.5570i.%%1.5710
1.5a701.55201.59701.62001.627o1.6330
1.53401.s7001.63501.66001.6am1.696o
1.632o1.67701.72201.74301.7580
1.695o1.74m1.78501.80701.8210
1.15101.80201.84701.81001.8830
1.75901.820U1.S6501.91001.93201.9460
1.9950
83.183.1a3.103.803.183.184.1
63.483.403.683.183.883.9
83.183.183.103.883.183.1
03.483.483.683.183.883.9
83.183.183.183.183.803.1
83.483.483.683.183.9
03.183.183.163.s83.1
83.483.483.683.103.9
03.583.183.183.183.683.1
83.1
Y
5
L3
1.33%1.37911.63s81.440a1.44801.45371.4636
1.40231.44221.48231.50331.52n51.5162
1.46461.50471.54481.56591.57301.5787
1.57/11.56721.60731.63831.63551.6h12
1.55751.58%1.62971.66981.69081.m31
1.65211.69221.73231.75331.7662
1.71461.75471.79401.815%1.8287
1.77711.01721.85731.87831.B912
1,70611.83%1.87971.92981.94081.9537
2.0033
9wmltYof
mrezd
6
74.174.174.172,972.171.369.8
74.174.114.172.972.171.3
74.114.174.113..972.1n.3
74.174.174.172.972.171.3
74.174.114.174.172.971.3
74.114.174.172.971.3
74.174.174.172.971.3
74.174.17<.172.971.3
74.174.174.174.172,971.3
72.9
50
FEE+lD-H28/2B
●
●
●
‘mEG? 11.X.4 - ~ bale size 1hits before threading for different lengths of engagement, starxkdUnified ard - U2G threa5s, class 30 [see 30.1) ~ - -t~~
—-
~ed hale size Mm.@ fur difierent 1,
7“
in1.32001.36501.41001.43201.44001.44601.4610
1.2s201.42701:47201.49501.50201.5080
1.44501.49001.53301.55701.56501.5710
1.50701.55201.59701.62U01.62701.6330
1.53401.57001.625o1.66001.68201.6960
1.63201.67701.72X1.74501.7580
1.69501.74001.78501.80701.82L0
1.75701.00201.84701.87001.8e30
1.1590l.ezoo1.86s01.91001,93201.9460
?~
1.32961.37221.41481.43661.44401.449e1.4645
1.39221.43471.47731.49911.50651.5123
1.45461.49721.539e1.56161.56901.5?48
I.wfL.55971.60231.62411.63=1.6373
1.54551.57961.62221.66481.6e661.6998
1.64221.68471.72731.74911.7623
1.70461.74721.789e1.01161.8248
1.76711.80971.85231.e7411.0873
~.nn1.82961.87221.91481.93661.9498
1.9991
k 0.33D W“ 0.67u
Minimm
~
1.32461.36241.42.231.43441.44L91.44771.4620
1.38711.43091.474e1.49691.50441.5102
1.44%1.49341.53731.55941.56691.5727
1.52221.55591.599B1.62391.62241.6352
1.53951.57461.61841.46231.68441.69n
1.63711.68091.72481.74691.7602
1.69961.74341.7e731.80941,E227
1.76211.80591.04981.n7191.B852
1.76611.82461.e6e41.91231.93441.9477
1.99691.9950
see fmlnotes at end of m.
UAnnm
10-
m1.33461.37591.41731.A3871.446o1.45171.466o
1.39711.43241.479e1.50121.50851.5142
1.45961.60091.54231.56371.5?101.5767
1.52231.56341.60481.62621.63331.6392
1.55251.5S461.6259>.66731.68871.7017
1.64711.68841.7W81.75121.7642
1.717961.75021.79231.81371.8267
1.77211.81341.e5481.87621.8892
1.71941.03461.87591.91731.93e71.9517
2.0012
—
Ch9 of engagemnt
P&W 0.6772thm 1.50
1.;961.37231.414B1.43651.44391.44971.4636
1.39221.43471.47731.49901.50641.5322
1.4S461.49721.539e1.56351.56e91.5747
1.51711.55971.60231.62401.63141.6372
1.54551.5?961.62231.66401.68651.6997
1.64211.60471.72731.74901.7623
1.70461.74721.7e9a1.81251.s247
1.76711.00971.85231.87401.8872
1.77281.82961.87221.91481.93651.9497
1.9990
12
~—
1.33961.37971.41981.44001.44ed1.45371.4676
1.402L1.44221.48221.50331.51051.5162
3..4646i.50471.54461.56581.57301.5787
1.52711.56721.60731.62631.63551.6422
1.55751.5E961.63971.66981.69081.7037
1.65221.69221.73231.75331.7662
1.71461.75471.79401.8L541.8287
1.77711.81721.es731.a7831.8912
1,78611,83961.87971.91961.94081.9537
2.0033
NAn?.1size in&sardthmods pertih
1.50C-61.500-81.50C+121.50C-161.500-181.500-201.5oo-2e
1.5625-6k7625-e1.5625-121.s623-161.5625181.56>2S
1.625-61.625-81.623-121.625-161.623-32L.625-20 ‘
1.607H1.6075-.91.6275-121.687$-161.6675-181.6675-20
1.750-51.75+61.750-81.750-121.75C-161.75C-20
1.8125-61.8125-8i.e225-121.822%161.0L25-20
1.S15-61.e75-81.e75-121.87S-161.875-20
1.9375-61.9315-81.937>121.9375-161.9373-20
2.000-4.52.000-62.000-02.000-122.0K+162.000-20
2.0625-16
51
EED-sm-H213/273
- -.
l!ALu.2 11.A.4 -“R&rrrdd hole size limitstefarethreadingbr differentlengthsof erqag~nt, st.artiard●Lhifiedad = W *e*, .=3d69= (* 30.U Y - ~~@
2.125-6
II6rJN
2.325-8 81R4.2.12522 Mm2.125-16 Mm2.125-20 2orm
2.1875-16 II w2.250-4.52.250-6
II %2.500-42.750-43.000-43.250-4 II=
tiI diameterof internalthreads
Minimum
3
in
1.94501.99002.03502.0S702.0710
2.1200
2.00902.0700
2.22902.47902.72902.9790
Fercentvof
‘Iluead
4
83.183.1B3.103.883.1
83.1
83.583.1
83.483.483.483.4
s
h.
1.96462.00472.04482.06582.0787
2. 12S3
2.03612. 0!396
2.25942.50942.75943.0094
Ferrem&of
Tluead
6
74.174.174.172.971.3
72.9
74.174.1
74.174.174.174.1
see frxsnotes at eti of Gable.
52
FED-Sl’lH28/2E
mw 23.A.4=~ Me sim limitsbfnre thredhq focdifferentkqtb of tcq~k, ~-- onifbd8rL2g=tkell&,c&M 2a(00e30.1)J/-amtillw2d—
~ bale slm Mni- & different luqttm of ~ II
TO ad iIY%u3~ 0.3~ II A@ve 0.3~ t&U 0.67D
7
2.3300
2.2C902.07m
2.2m2.47902.7m2.9790
26nLimmll Mnioma
in h1.9s63 1.96%L.9P73 1.99M2.0396 2.03n2.0616 2.05542.0766 2.0721
2.2262 II 2.3229
Z.mn
II
2.03612.07% 2.0746
m
10
h1.95%2.00092.04232.0637Z.om
2.3262
2.02942.cm6
2.25392.50392.75393.0039
-o-~til,= I124andslx@lnimsEo
32
in1.95461.99772.039s2.06352.0747
2.3260
2.02262.07%
2.24442.49442.74442.9944
in1.9644 2.Xu-4ZO047 2.22s-82.OUB 2.32s-3.22.0656 2.225-162.0787 2.225-20
2.2293i 2.387+3.6
2.0263 II 2.250-4.52.m% 2.2s0-4
2.2594
II2s00-4
2.50942.7596 :=3.0094 3.*
3f21=dlffe2ambmlht=arecq+dbthemkr dXbr2rhr-fc c3aytlmofc~t badhSM3hlg o.3m. ~,t.b~mluesbr klgthaoc UqagaEnt gmlk thsn o.3m in SIZZ2S0.25 tn.d hrocr am ti5t62 - tkt Um differertm~tbeen lidtn is - 2eso tkm 0.0060 tn. Fur dbseepitch ~tmti other * t.lm9Bgiven in this t8b3e, mc 30.2.
2k.3eslw Mmiil125(21rRta?r+tctl.adi=laticmahtlk41Lbr0tqQrMrin thiatah2e mlyhc&lMrledbyuR0sva.bs&thiswpm96&2u!er9 iwadk~ikheilnthmin tbtaae!(1) Ulthtbmpiaml[2)wiuladi=mtAEttmtis3es9bianintI?911J [email protected]!EtH-Qiml a&iMtimti
14ucb & tin ~ are&sired. ou3z:vahua3nt.tmtabf0rmalna2 oimk?sdtbml.ooin.~trJw05&tMdpu6me.)
~i m*taint&. va2mdf0rt& 4.0m3-m3+m thremf. U3f 2.OQO In S2.2m ti &e 2.c@o-m tkueti6kam Jn the t8b2e. = Vd83S tudd thn ~: 3.6630, 3.8722, 3.8684, 3.8759, 3.8m2,3.67P7. mm pantagm of thread vLu -III Lmdmqel.
~8aw2.m ~.cau&d Offint.hpr&irq mlum. 100 prxcsnt of thred - 0.75B (m 20.2.3).
53
l?EIF.SSD-H28/2B
—.--
APPENDIXB
IE.SIQ4@UNIFIED—~
I 40. ~. fiis apg=dix prwides guidelines which rcaybe used in thedesign of unified screw threads for threaded parts. It is not a rnardatory part
of the standard. The information IXX-Itained herein is intended for guidance
only. It supplementsinformstimrnntainedin ApperdixB ofJ@i8 Bi.1-1989.
I 50. General.
50.1 Intrcductim. In general,any givenprcblemin threaddesignmay te
I ==@ible tO ==~ mre or less Satisfacbxy sdutiona basedon thepreljndnaryselecticnof certainelem?ntaof the designand the prcper
I adjustmnt of the O* elenmw. In othermrds, threaddesign is to a largeextentempiricaland is partiallybasedon previouse~riene with similardesignsad the j~nt of & designer. Acmrdir@y, it is not practicableto presenta definitesystemof approachto the designof a threadedassemblybut nrely b presenta discussia of variousdesignfactirs.
50.2 Factorrelationships.The interrelationof lengthof engagement,minimmnmajordiameterof the externalthread,maximumminor diameterof theinternalthread,ard the stre@h of the assembledthrecdneeds to be urrier-sbrrlti carefullyconsideredin order to producetlm?optimumdesignof aspecialthread. It is not eccmunicalta use eithera ler@I of threadergageuent which is longerthan required @.sbor@r than thatwhichwill davelopthe ●full strengthof theexternallythreadedmember. Otherfactors,suchascontrolof tap breakage,prcparseatingof a threadedparton a sbcul.der,thepreventirmof cross threading,omditicns of loadingwhen the assenbl.dpartsare not concentric,SIXIpassiblecollapseof a hol.lcwexternallythreadedmmber, requirecarefulanalysisti adjustmnt of thedesignwith respecttoselectionof the diameter-pitihcurbination,the classof thread,lengthofen9a9~nt, and major and minor diametertoleran=s.
50.3”Threadfit consideratims. A close fittingthreadassemblytier acmeCcrr3iticnsmay fail,whereasthe causeof failuremsy k elimina&d byprovidinga Icoserfit. A cap screwthatseatsonly on one side of the tearingsurfaceorderthe hea3 may breakoff when the screwis tightened.Wken a screwhas a largetearingsurfacetier the head or when the headmust be squarewitha projectingpin, sufficientpitchdiameterclearancemust be providedto allrwfor any out-of-aqdarenessof the screwaxis with the bearingsurfaoeurderthehead. Thus,as largea pitchdkuretertoleran~ as pcssible,togetherwithprovidingproper toleranceson squarenessof face with the threadasis whereseatingis reguired,may avoid thenecessityfor specifyinga heat treatedtmlt.
I 54
??Eo-s!m-H2e/2B
50.4 .Staniardthreads. use of standardthreadsis reguiredin accordanceInformationon preferredsizesad classesbr .sp3cia2threadswith 4.●7—
appeSZSin 5.1 and 5.2. Wheneverpracticable,lengthsof engagementforcc.srse,fine,4, 6 and 8 threadseriesshouldbe tetween5 pitihes- 1 l/2diamters; for all other seriesthey shouldte’betwsen“5”@ 15 pitches.A&i= theseprincipleswill help keepcostsof nwinufatiread gsging
60. mtriciti of as-ly and cross threadinq.
Note: Tat& 6 of Xi&E B1.1-1989inch.deetabk.s of“O.375H,0.75Hh H.
In aesemhlyad use, tk crxrbiredkkmnces ad armarms on bothmatingparta shouldnot allow threadsto disengagecm o= sideW&en assemblyiseccentric. I’& axis of the internalthreadcan be displacedradiallyfrrsacoinc~with *asisofth ex=nalthread byamaimuntequd totheaumof the pitchdizuretertolerancesard the alkwame. This radialdis#acementmay be sufficient= that the flankom~t is entirelycm one sidead on theopposi~ side the crest of the externaltbre~ will bs. in line with tl-e crest
of the uternal thread with the following results * * screw is constrained
in sti a ~sition in a tq@i hole: (1) There will & danger of aossiq the
threads in starting,iux3(2)the screwmay @ out of thetole when tensionisexertedin thisconstrained~sition. The minimumanuuntof overlapisarbitraryaml controversial,tit the followinggeneralrulecan be used in lieuof mre specificdata:
* the first step to assuretk minim.nnsafe overlapon hth sidestin theassemblyis amcentric, the differencebe~ tl’eminirmmmjor ditmeterofthe externalthreadad the n!axti minor diamter of the internalthreadslmld not te less than twicethe addendumof the externalthread (0.75E).O*rwiae stated,the sum of themajor+ iaretertoleranceand allowsnce,ifany, of the externalthreadad the minor-diametertoleranceof the in&xnalthreadshouldnot be greaterthan 4/3 the addendumof thz externalthread,0.5H. This providestir a minim.mof 50 percentthreadengagement.As theaeccndstep,to assurethat mininunsafe overlapon one side when the assemblyis ~tric, tte differencebetweenthe nbsximumpitchdianeterof the internalthreadand th? minimumpitch di.amterof tk externalthreadshouldnot begreaterthan the basic threadheight (O.625H). otherwisestited,the ~ ofthe pitch-diaretertolerancesof troththreadsand the allowance,if any, shouldnot be greaterthan the basic tfueadheight (0.62513).This providesfm anecxx?ntricassemblyccmditionequal@ half the beic threadkight (O.3225H)and zeromini.mmoverlapon cme side. If the resultsfrcm the limitsof sizeselectedviolate& atmve rules,the toleran~s shouldbe reducedby usingacloserclassof tolerance,assumingtolerancesconsistentwith nnnufacturingpxsibility, or a marser pitch shouldbe used to increase the amunt ofoverlap. The nujor~iameter tileranceof the esternalthreador minor-diametertoler~ of th internalthreadshr@d not te less than the pitch-diaretertoleranceof tk respectivethread~ maintainthreadform. Also, it shouldbsnoted that,if the toleranceon the minor diarreterof tbe internalthreadmustneeeearily be large,&s nmjor diameterof the externalthreadmust be heldclose to the msxinummajor diameterad vice versa.
55
FED-SID-i128/2B
70. Str engtb factors..-
70.1 Tensilestressarea. Testa have * thatexternallythreade3psrtsfail,in tensinn.atlnadscorres@rxiQ in *, of xntbreaded.parb.nitbdiamters midwaybetweenttx?irpitch & minor dtiters. Formulas(la)and(lb)in table11.B.1providestressarea tasedupn a diameterapproximstdymidwaytetkeenmininnnnpitchdiameterand mininn.nnminordiamter. Theseformulashave been applifslsuccessfullykY steel.and otiernY2b.Lswith ultimatestrengthsup to 180,000psi and are oftenused for productacceptance.milestressareasfor s=ard sizesare tabulatedin section11 of = B1.1-1989.
70.2 Shearareasat minixmnnmaterial. The gatric s~ar areaof anin~ threadat minimxnmaterialis ecaualto tb? areaof that tbreulwhichis intersected by a qlider with a dians&r equal to tbe mininm najordiareterof the matingex@’nal threadover the lengthof engagznt. This is
identifiedin figure2.B.1for a one pitchsecticmad formuhs (2S)and (2b)in table11.B.1are used forcalculation. Simil.srly,the gemretricahearareaof an externalthreadat minimummaterialis equal tm the area of thatthreadwhichis intersectedby a cylirderwith a dianeterequal IXJthe maxiusnnminordiameterof the matinginternalthread. ‘I?& is also identifiedin figure2.B.1for a one pitch sectionam5 firnndas(4a)and (4b)in table11.B.1areused for Calculatiral.
,.
56
FED-sTD-H28/2B
TABLE 11.B.1 Formulasfor screwthreadstrengthfactors
1-
FED-!31!wIi2e/2B
I
I
I
I
I
I
I
I
I
TABLB II.B.2 Formulasfor screwthreaddesign
Rferem=90cmlhmmbm
Kfuueeter iatic mrmfd P=$m@
[f-l) Iuuilc Btresa, ‘zxterd.fy % -:. km (b) ~ (M) 70.6~ prt - We fmsim
a
(23) ~ tii2a .t.mM, 5:.5:+5 & 70.6exwrnally tfueafd prxt 2
?WifbSt -
0.7654~d+w]
+E
““*g
6A: fzm (,d)0, (fb)[13) Ialgthof rl?3ngEerlt fssrdltul. r.?-
~ * fAilLUC 0~ ..&d~
70.7.3
ad Intellnlfbra
3A; frm (3A)or (lb](M] laq’tbOf0qag5mtfssmdqm m. 70.7.4
W of extxrnc.1 thread .W. fcus Na) or (w
fts
2A” fzlxl (k.) or (fb)(M) Ia-@fl of ergLgrs51t fused up 12—~ 70.7.5
dQR3@ng fu12 tendle tieqth M frmd Mb)of exturn, t.hmrd Wifb tfuti●t -ic Si’Z3 - W vitb [161
tms \
[16) m*Ofew+f==ntw- Iz-Izfrcm[Elx LEEu %7.5A?arofintmnalfmuld ~ m (9)
k )isgremcrtfml
,
fbmtim: dpim - mfnimnl mlmr dirllmtic, external thcead, flat form (- K+inl . im=h.
xndmub [12),dl.nin-d+-~fl-d~-~
dh . me diawter, eat.crrmlly tfxe?ded put, inch. If tic, is M tie, db - Q
58
FEtWlWH28/2S
I sEmoNmMIN,M”M I
I SHEAR AREA OF
INTERNAL TNREAD I
m ““’”’ ‘MAXIMUM MINOR OIAMETER MINIMUM MAJOR OIAMETER —OF lNTERWAL TNREAO OF EXTERNAL TNREAO
70.3 Shearareaaat basicsize. The gearetric*ar areaof an exkwnal
thread a=ic size is equal to tke area of a basicsize threadwhich isintersectedby a cylinderwith a dianeterequalto the basicminor diameter.
Formulas(6a)and (6b)of tible11.B.1are used fircalculation.‘Fhsgecznetricsheararea“ofan ~te&al threadat tasic size is not ordinarilyused forcalculations.
70.4 Sheararea simolif&~ formulas. ‘mnnulas(3)and [5) in -le 11.B.1are siniplified fornud.asfor Internal ad external thread shear areas. They are
based upn aqirical dati ad give shear areas whichvary frmn the gecan?tricminimummaterialshearareas. In sczne-s, testdab agreesnxxe clmelywith thesesimplifiedformulashearareas thanwith gecmstricsheerareas.
59
FED-S’i’WH2E/2B
70.5 Sheararea,cabined failureof externaland internalthreads. Whenthe mstfngexternaland internalthreadsare a partsImnufacturedfran ●materialsof a~roximstelyequal strength,failurewill usuallytakeplace intoth threadssimultaneously.Threadbendingduringfailurecharxp the threadgeometryin thismae sc thateffec$ivesheararea is significantlysaallerthan tise -lculated franformulasdiscussedin 70.2,70.3ard 70.4above.Formula (7) in table11.B.1is an ~irical formulawhichgivesan approximateequivalentfor thiscase. Numerically,it describesa failureat the pi&hdiamter of one of the threads.
70.6 ‘[email protected]. Formula (1.1)in table11.B.2is oftenused foracceptanceof externallythreadedfastenerswith ultimatetensilestrength,yield strength,or rareother selectedstresslevelappliedto St in order bdeterminethe requiredaxialtest load. When threadsare used in a joint,atightening torque is applied to over- friction tier a tdt head or nut, b
over- thread frict ion, ard to develop the axial lcasd. This torgue results
in a shear stress, which when tiined with * tensile stress fran * axial
load, causes an increese in the effective tensile stress. Etxmula (12)in=e II.B.2describesthis situation.Experien~ has slxnmthat for a solidexternallytbrerdedpart, the ccmbinedstressis generally*ut 20% greaterthan * tensilestresscalculatedfrcxnforrmd.a(n). Therefore,in this case,the crrnbinedstressis oftenassuuedto be 1.2S or is not considereddue bSStisfact.myexperiencewith tbe Facimrof Safe& used.
70.7 Lenqth of engaqem?nt,LE.
70.7.1 If failureof a fasteningsystemusingstardardthreadedfasteners ●shculdomur it is generallynure ecommical tit the externallythrezuiedpartwill breakratir thanthat eitherthe externalor internalthreadwill strip.In othermrds, the lengthof threadengagenmt stxnild& sufficienttn devel.cpthe fullstrengthof the screw. ‘Ihua,the lengthof internalthresdard thediuensirmsof this thread,particularlyitsmimr diameter,shouldbe suchthat,takingintoacrmunta pxsible differen~ in strengthof materialof t&internalad externalthr.swls, the threaded pxtion of tbe externallythreadedpaxt will break before eitbsr the external or internal threads strip. Due tothis situation, lengths of engagement formulas are dez ived fr.anshear fornulaswith tensile stress area ~ replaced by X because the reguired area in
skar is twioe tlBS tensile stress area in order b develq the full strength of* externally threaded part. This relationship is baaed upm experkmts mileby tbe National 3ureau of Sta.r&rds in 1929, in which it was foundthat forkt-roll@ arxlcold-rolledsteel,and brassscrewsand nuts, this factorvariedfran 1.7 to 2.0. The effectof ccmbinedstressis not tikenintoacmunt incalculationof 12?becausethe added @ear lcxd affectstoth tensileard shearstressesin approximately the Sanb2 prqrtion.
● ’60
EwsmB28/m
70.,? :2, All Iimmlaa -r @gth of engag-t, given‘intable11.Bi2yieldapprQX_te Val= Since theyare based in part upn shearareaswtiic.h%renotexactdue to nut dilatim whichvarieswith gmtry, frictionforrs, ardmaterialproperties. Also, the effectivemssof partialthreads,in *countsrsinkfi~ordmnifer6)ciitliie*” of the intird thiead,‘isiiitalwaysthe Smle. For calml.atirxu3,approximatiy ba.lfthe crxmtersinkd@I may teccmsideredin the -lengthof ~t. It is advisablethat~tirms oflengthof engag~t and correspx-ding hd capabilitiesof a threadedjointbecheokedby actualtests,for criticaljoints.
70.7.3 Wls?nthe ex~y ad internallythre?skaputs are made frrmlmatir* of approximatelythe same strength,requiredlengthof engagauentinformu2a(2.3)of tableII.B.2may be applied. This assumesa cmthatirzlfailureof both threads (see70.5).
70.’7.4When * strengthof * internalthreadmaterial.lvexceedsthatof* external thread, r+ired kr@ of engagementin form& (14)of tableII.B.2uay be spplied. !RIisassuresshearof the externalthreadd uses thegecmetricshearareaof the minimumexternalthread (see70.2) . A slightlyI.mgeror abrter lengthof eng~-t will te fiicatad if the simplifiedformula(5) in Uahl.e11.B.1is used.
70.7.5 When the strengthof * externalthred materiallyexceedsthatof
I
II
I
I
o
the internal thread, reguired hrqth of engag~ in @rmula (16)of table11.S.2is used. This is basedqxn the internalthrezdstrippingloadM.ngequal b the ncminalexternalthred stri@ng load whichwilldevelcpfullstrer@ of W.externally,threadedgmrk. Zf & ia.Jaas.thsn.1,see
7.3.70.7.4ard if approximetilyequal to 1, see 70.
70.7.6 For an adjustfigor lead screwof if the ~ctim will befrequentlyunscrewed,* *ulsted IE simuldbe increasedto a.1.kwfir thee~titear On * flanksof * threadsduringtk usefullifeof tbe
.
“~0.?17:For”t&ed)n2es”in ahi?et”*M, ,* kinum size of th6’screwto be~ifid stxd.db such”thatthe thicknessof sheetequak theLE requiredtodeve@ full StKel@h. In order to use the largestpssible screw,it isn~ssary that tbe tolerance,~, cn the minordiameterof * b.laslx.nddbe * practicalminimun. If it should“prove.ti& inpracticahleto reduce tk
inimr diametertoleranceb sucha vslue, it may be n~ to decreasetheminimumminordizmter of tl16internalthre~ arxlto increasetb minordbtar bleranca by the:= arxnant.If this..i6 daqa,..tlp.Jmximum@BJKdi,amStarof t.hsscrewmust be reduc@ ~“ th ~ auxwnttopreventinterfermce aIX3the.rniuxdianeterof the ~ threadringgage must likewisetedecreiisd,as this is W cnly controlof theminordianeterof the screw. Inall awh cases,wtw?redimensionsare alteredfrrznthosecalculatedacmrding totk standard,theAQ4?.B1.1-2.989.
. . .
threadas.bu.ldbe designatedas specifiedin sectirm6.7 of
61
FEESTD-H28/28
70j.& ~r’ retainingus iiishafti“tie * ‘** aiialfirceresi-by the collaris appreciablyless thenthe tensilefir02that““theshaftiiselfis“capableof resisting,LE need orilybe lcmg etx)qhb withstadthe expec~ axial.forcgw the mllar. If,FC is.QK axial..for~..@[email protected] the mllar, UIS~ is the tensilestrengthof the shaftad W1’Snis the tensilestrengthof the collar,calcolatethe requiredlengthofengagenrmtfran one of the followingfornmlas:
Z?ca. ColJ.ar thread strip: I.E=
~ x ASn from (2a),(2b)or (3).—
LE
2??=b. Shaft threadstrip: LE =
L71S5x ASS fran (4a),(4b)or (5)
z
c. Cmkinatirm threadstrippingwhenWIS.s= W1’Snapproximstily:
2FC~.
UIS5 or WfSn x X frrxn(7)
-FE
Note: Numbers in parenthesis are &mmila v’mmters,frcxntable11.B.l.
70.7.9 For I_dlow,thinwall threadedpertsas the wall thicknessof eitheror bth the internal ad externalumbers-~s thin,the temkncy of tlEexternal mmker WY enlarge ad the internal Xremker to neck dcnm in * threcdmeans thatsn I.Egreaterthangiven by fornulamustbe used,also that thetilersnceson minordiane@r of the intxmal threadard majordiamti of thsexternal‘thread,~ ad ‘M, must be smll to obtain* maximumpracticabledepthof threadengagement.For cxqanents having~eeds on thin-selltubing,tests@e? actualtmrkingconditionsslmld be made ti determineprqerselectirnof wall thicknesses,lengthof engagement,and pitch of thread.
80. l’bredm-qxxtims in relationto tapping.
80.1 In the productionof threadsit is rxms.ideredimpracticalto tap athreadunlessits nmninaldiameteris greaterthansix timss.the lxsicthreadheight;therefore,wtr?nti ratioof D to h is less than 6, tk use of a largerdiamter, a finerpitchof ~e@, or both,s~~d te mnsidered.
80.2 ‘l’he size of9
is a factorin cmtrolling tap breakage. Tap breakageis infrequentif the larm2tirof the tap is over 0.5 in. or if the lengthofthreadto be tappedis less than0.5D. For sizesless than0.5 in.and lengthof threadover O.5D, tap breakagecsn be minimizedby use of a largeis ~ trash.
~ thatHowsver,thismeans thatLE may have to be increased
developthe fullstrengthof * screw.
62
FEO-8TD-H28/2B
,.90.--Bxal&s Rf.hreaddesim.. :
... ....=.,.-90a ‘&m &rel thread. A gun barrelis subjectedb an internalexplosive
pressurethatproducesa tensilestressin the threadederd. The lengthof~~t of the ~ ~ be -SUfficient‘toprcducea &* -~ea inshearon tk threadsof tk e.crm in line with the mi.mr di~ter of the tap~dFOle thred.sequal to twice * stressarea of the threadedporticnof *barrel. Assume that * thread on the barrel is 1.500-8aN-fiad the minimuminternaldiaus?terof the baxrelat tte threedederxlis 0.792inch.
I Note: 8ymbolKAaticm ard fornuib numters in parenthesisare inaccordancewith tables11.B.1 ad 11.B.2.
a. Pe@red lengthof engag~t is titi usingformula(14)fix al?dl.owpart.
(~ . 2 As - o“7fJ54d;)
with~ =( \
0.7854 dw - 0.9743 2. In thiscase,As may te
read as \ ni
1.492 fron table13 of ASM3 B1.1-1989.
dh = 0.792
n . 8
%= = 1.390 frantable34 of ASME B1.1-l!389.
d@n = 1.4093fran tah.le3A of ASME El.1-1989.
b. Calculatingfrcsnthe atnveyieldsa requiredlengthof eqagemnt of0.777 inch. By reducingthe internalthreadmi.mr diametertoleranceby half, the resulting
?nsu is reducedto 1.3775
inches,zud the reguiredlengtho engagemnt is reducedto 0.714inch.
63
90.2 screwsnmmt@ bracket.b Cask irm part. lb dimeosirm.iarequired.——for the largeststsae.1asp Z= tit can.k@used .tobald a ,bracketon,a.uaatira-:x@. ‘@e tgrisilestrengthof the steel is 60,000psi, the t@ailestrerigti“ofthe cast iron 20,000psi,SIXIthe thiclmessof the cast iion is
●sti that the lengthof threadcmgageanenkcanmt exceed1.750in. Tbe screws
-.on* *.eide *f--ti-ba!*”wilJA-iJl-tassios.---.------’--------------------,, ... .. ..,., ... ,.. ....... .. .
~te: .Symbl mtatinn and formulanumbersin parentbesiaare in=rdane With tables11.B.1ard 11.B.2.
a.
b.
c.
d.
e.
f.
Since tkexkrnal threadnxiteridis considerablystmqer thanthat of the internalthreadmsterial,in -rdanCz with 70.7.5,formula(16)wi.U te used to d.culdte the lengthof engagementrequired. This Ermmil.ais appliedfor LE tasedupn shearof theinternalthreti. ‘R3rmnfirmthisasswuiptim,Ij4 shouldbeCalculated.Rl cannotbe calculatedfrcm formula(8)until a threadsire isselected. BY definitim, however,R1 is * ratioof ex-nalthreadsheararea ti internalthreadsheararea. M approximationof RI, ran be readeusing* simplifiedformulasfor shararea5 so
ApproxhsNz
~ is calculatedfran
U&
R1 . F&Ida (5) . 0.833
ZziEm
fonrnd.a (9).
%= ~;=- =0.333
Fran b end c abve, R1/R = 2.5 approximtdy. This *Wz“beinggreaterthan1 m mm tbe use of formula (16) for
calculationof lengthof engagement.. . . .
Fran formula (16)it is seen that * lengthof engageumt mustk approximately2.5 timesas lmg es that requiredif shear intheexternalthreadwere tke omtrolling factor. Thusr Since*maximunavailableLE is 1.750inchs, the approxiOataLIZrequiredfor tbe screwto develrpfullstrengthis 1.750/2.5 = 0.700 inch.
J.mmuch as the hole is tappedin cast iron,a relativelycrarsethreadmuld be reguired,that is W or coarser. The matreadilyavailablescrewsvmuldbe UK. Selectthreadsi7-esfranfigure2.B.2whichyieldLE of a~roximately 0.700inch. Figure2.B.2 was devel~ fron formula(1.5).
For 1’ - 8uK, LE/D = 0.594and LE = 0.594
For 1~- 7’UK,LE/D = 0.592 (est.) and U? = 0.6568
For lL - 70’N2,L@ = 0.600 (est.) and E = o.7504
64
IEZD-S7TD-R28/2B
I!0
h. The threadskouldke checkedin zciwrdancewith formula(16).Formula (16)may be exprb as follcws:
3.1416~min XL
4
(with ~ = 0.7854 db - 0.9743)2. In thiscase,As IMy-be read as \ ‘}
0.763frr.entahl.e8 of ASMR B1.1-1989.
r+lnin= 0.970fran table34 of ASME B1.1-1989.
FOrIIU.&I (6b) +X%*‘1 = Fo@ .
.,. . . .. . . . .!n[ 1
ihnin:Lax. 0.57735 (dQin ;- I&sax)
n=7
dmin = 1.1064franixib.le3A of ?!SkiEEl.1-1989.
D2max= 1.0416fran We 3A of M24E B1.1-1989.
so R1 = 0.863
RI . 0.333 fK!IUC *W.
i. Calcuhting frmn0s atme yieldsa requiredlengthof engagementof 1.729 inches. This is acceptablesince it is less than themasimumavailableengagmt lengthof 1.750.
I65
FED-Sl!D-H28/2B
tmmwcammmmm m msttn ‘am
66
(-4
!3E
P’EMm+w29
.. - APPENDIXC..~ _=-, .. ...
AMERIC2NNWX2QLFWU4CFTHREAD
100. ~. This appsrdixprovid~ gemxal informiticm‘atimttheobsoleteIimericanNati.trialform screw thr~s. It is not a mardatorypsrt of thestiard. See 5.2.1 for eelecticmof atamiardlhified screwthreadclassestoreplacetheAnericanNationalform threads.
110. Profiles. Basic profile is the same as thatof M Unifiedscrewthreadexceptthat the width of the fbt at the root is 0.125P. The designprofile for internalthreads ia the W as thatof tbeUnifiedscrewthread,i.e., widthof flatat the root is 0.250P.
3.20. ‘llueti classes. ‘here are 5 cbaees of AmeriainNationalfbrmthreads. Ebr informatirmon Class 5, see FEM?m+28/23, C1.aSS5Interference-FitScrew Threads. See below tir otherclasses.
120.1 AUowaces. my Class 1 externalthrede have an alkwmce. Class 4externalthreadshave a negativealhance on the pitchdiametexonly.Allowancesare ehmm in Table 11.C.1.
120.2 ‘lbleran02s.Piti diaretertiler-s for externaland internalthreadsare .sl’nwnin Table 11.C.2. Externalthreadmajordiamter bkrancesfor Uaaaes 1 ad 2 equal twim their respectivepitchdiamebertoleranms; theClass 3 ad 4 tolerancesare the sameas the Class 2. Internalmi.mrdiam=tertolersrms for Classes1, 2, 3 and 4 are @ to 0.1 t~s the design(minimum)minordi-ters.
120.3 Formulae.
Note: Pitch,P = I./threadsper inch.
120.3.J Internalthread.
Min. major dia. = basicmajor dia.
Min. pitih dia. = min. majordia. - 0.649519P
Max. pitch dia. = min. pit@ dia. ‘“~ fr~ TFMe 11.c.2
Min. mirxx dia. = min. msjor dia. - 1.082532P
[email protected] dia. = min. minor dia. + 0.1 (min.minordia.)
120.3.2 Externalthread.
Class 1 max. major dia. = basicmjor dia. - esl franTable 11.C.1
masses 2, 3, 4 max. major dia. = basicmajordiameter
67
FBHmx328/ZB
-..—.=.
Min. majordia. = max. msjor dia. - ‘I’dfrcanTable 11.C.2.
I Classes 1, 2, 3 mix. pitchdia. = max. majordia. - 0.649519P
Class 4 max. pitchdia. = ~. rmjordia. - 0.649519P+ esfrcnnTable 11.$.1
tlin.pitchdia. = max. pitchdia. - ‘R32frcsnTable 11.C.2
Max. minordia. = max. majordia. - 1.226869P
130. Desiqnatims. StandardAnericanNstionalfirm threadsare deaignatithe saue as the Unifiedthreadsexceptthatseriesi.rxiicatirdces not we the“Umand classdoes not have the ‘Ae or “Bm indkdth fix “external”ormintermal=.Thus, a stam3ardthreaddesignaticmmight read ‘1/2-131?l-2m,brexmple. A seriesdesigmstor‘W” is used for ~ial crmhinatima ofdiaueters,pitchesad lengthsof engagmnt.
140. -es. ~es are designedin ~rdance with tteprinciplesof Unifiedthr~ gage design. See ~8/6, Gagesand GagingfirUnifiedScrfiwThreads- UN ad UNR ThreadForms.
,..
I 68
,., ,.,
I?Ews!m+128/2B
‘““TRBLE 11.C.1- Albwance for AuericanNationilScrew‘?lhreiuk:.._.=.
Threads“perinch, tpi
8072645648
4440363228
2420181614
1312II109
87654 l/24
0.00070.00070.00070.00080.0009
0.00090.0010
0.oo1.10.oo110.0012
0.00130.001.50.00160.00180.0021
0.00220.00240.00260.00280.0031
0.00340.00390.00440.00520.00570.0064
. Class 4 negative
allWanCx2 , es4
inch
0.0002
0.00030.00030.00030.00040.0004
0.00040.00050.00050.00060.0006
0.00070.00080.00090.00100.oo1.10.0013
1069
EnHTD-H28/2B
-* 11.C.2.-Tolerances@r Ameria National Screw Threads Y ,,:. ●
Threads
per inch,tpi
8072.645648
4440363228
2420181614
131211
109
876541./24
Pibh diasetertolerarmesInternaland externalthreads
class 1
l“D2/’m2’
inch
0.00240.00250.00260.00280.0031
0.00320.00340.00360.00380.0043
0.00460.00510.00570.00630.0070
0.00740.00790.00850.00920.0100
0.o1.1.10.01240.01450.01690.01840.0204
Class 2
Trl.@32
inch
0.00170.00180.00390.00200.0022
0.00230.00240.00250.00270.0031
0.00330.00360.00410.00450.0049
0.00520.00560.00590.00640.0070
0.00760.00850.01010.01160.01270.0140
claaa3
m@32
inch
0.00130.oo130.00140.00150.0016
0.00160.00170.00180.oo190.0022
0.00240.00260.00300.00320.0036
0.00370.00400.00420.00450.0049
0.00540.00590.00710.00820.00890.0097
class 4
‘rD#rd2
inch
0.0011
0.00120.00).30.00150.00160.001.8
0.001.90.00200.00210.00230.0024
0.00270.00300.00360.00410.00440.0048
E&r
class1
m
inch
0.00480.00500.00520.00560.0062
0.00640.00680.00720.00760.0086
0.00920.01020.01140.01260.0140
0.01480.01580.01700.01840.0200
0.02220.02480.02900.03380.03680.0408
1 threada
;laases2,3,4,
‘m
inch
0.00340.00360.00380.00400.0044
0.00460.00480.00500.00540.0062
0.00660.00720.00820.00900.0098
0.01040.01120.01.180.01280.0140
0.01520.01700.02020.02320.02540.0280
1/ MinordianAer tolerance for internal thread is one-tenth of the_.minimumminordiameter.
70
I
FED-SIH128/2B
o1.
r
I
●
.-. .; -T-,
CustxMians:
“~v+&
Air Force - 99
ReviewActivities:
Amly-cR, E?i, ER, MEAir Force - 11, 15, 82
UserActivities:
Army -AT, MI
CIVILAmtcY ccoFu31rwrIm AcrlvITm:
GA-7FXEEur-AcclNMiA-JFK
PREPARINGPLTMTY :
D.I A-Is
(DcDProject‘I131X3-0082)
71
SIANDARDIZATION DOCUMENT IMPROVEMENT PROPOSAL‘ (*lmfnImml - R~ S&)
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NAME OF SUe.un-rllw OnOAwlzATlON 4. TVPE OF 0RGAM1L4TIOU (~ a)
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NAME OF SU@MITTER (kt FIMI. Ml) - O@an,l b, WORK TELEPMO”NE UUMOI?S flnddrColid - Opuolld -
@AtLINO AoORF?SS (7J08,1. .2ty. Stitr. ZIP Cdl - O@onal S. DATE OF SUEIMl~lON (YYMMDD)
,- ----- . ---
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