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FEFSTD-E28/2S 20 AqJst 1991 SUPEI?SEDItG FED-STD-F128/2A 20 April 1984 (seeNote)

FEDERAL STANDARD

SCREW-THREADTANDARDSFOR FEDERALSERVICES S

SECTION 2 UHIFIED SCREW INCH TMEADSFORMS UNANDUt14R THREAD

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This standardwas approvedby the Ckxmnissioner, Federal SupplySsrvice,GeneralServicesAdministration, for the use of al-l Ekderalagencies.

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APEA1'ms A. -Approvedforpublicrelease; distrikxkion unlimited. is

DISTFUW1'ION ~

This FederalStadard is issuedin lwsel.eaf form to permit the insertion or removalof new or revisedpages ard sections.

All usersof FederalStadards stculdkeep them up to date by inserting revisedor new pages aa issued* removingsu~seded ad canceledpages.

w ad revisedpages will be issti tier Change Noticeswhich will be nunberedcmsecutively ad will bear the date of issuance. ChangeNotices shouldbe retainedd filedin frontof tk stadard until such time as they are s~rseded by a reissueof the entirestardard.

EtnawmI ,., , This secticnwas develqed b provideUnified Inch Screw Threada br the FederalServices. It Q formxly kmwn as "[email protected] ad Thread Series for Bolts,.!kretrs, Nuts, Ta~ Boles aM GeneralAppli=tions=. EEWS1'&H28/2Aws a [email protected] revision of FR%7TWB28/2 dated 31 March 2978. It added the nsiterial previouslyidentified FfD-sTD-H28\3 as dated 31 March 1978,which was knownas "Unified Threadaof SpecialDianeters, Pitches,.d Lengthsof Engagenx2nt". a &terial franAppmdices A3 ad AS of FED+IWB28 dated 31 March 1978 was revisedad tecaueApprdies A and B, respectively,f FBD-STD-E28/2A. o .,,...,, .,,,....:, ,, ,. .,.. .. .... . ,., FSD-51WH28/2Awas preparedby tk CefenseIndustrial [email protected] Center ~-IS) and inoxpxated the AmericanNeticnalStardsrdb' Unitied Inch Screw Threads, WI B1.1-1982. Significzmt changes fran the previousissuesincltiedthe following : (1) Added UNR, externalthreadform with mandatoryroundedrrnt. (2) Sevisedtolerancerequirements for lead and flank angles. (3) Added requirements tir controlof surfacetixture,cknfers, ad rolled threadled-ins ad run-outs. (4) Added requirement that inspection methods for acceptability are in . aaxmdance witb FER51D-H28/20 FED-STWH28/2B incorporates the AmericanNationalStandardfor IJnif Inch ied Screw Threads,A.SNZ B1.1-1989which superssdsd A!W B1.1-1982and its dated 20 April suPPl~t , At=z B1.1s-1984 It @ates the FEE.S'K)-H28/2A . 1984 ad improvesthe legibility the tables. ~ndix of C was .dded to provideinfonnaticm alxmt tk obsoluteAmrican Naticna3form threads.

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FED-sl'D-H28/2s SETIOW 2 - UnifiedInch Screw ThreadsUW ard UNR ThreadFOrIUS

1- ~ ~is ~tion providesthe standardfor WIif ied inch ~rew threadsto be used by the FederalServices. 1.1 ,Qm.itations. (My uw ad UWR screw threadsare cmered in this sect ion. Ebr UNl threads (axkrolledexternalthreadrouded root with increased basic minor diamter ) see FED-STD-H28/4 (MIL-S-8879 For UN! ). threads (miniature threada)aee FEO+lD-H28/5. 1.2 Application. 1.2.1 UW form screw threads. The uw threadis intendedfor generalpurpose fastening ~~i-G; Its externalthreadroot may be either flator rourikd. 1.2.2 UWR form scrqg i+reads. The UN'S form [email protected] mly to external IS the sa.m as that of the external UN thread except threads. Y&~l~&n that the rcot is requiredto be rourxled. UNR threadsare appliednmt often `m high volum annnercialfastenerthreadsproducedby rolling. Nnz: The uardatiryroumiedrcot of the UNR threadgreatlyreduces the wn02ntration of stress,knee increasesthe fatiguelife of threadedpr ta.

Referenceddcmnrents. 2. ----. -- 2.1 Governxren~uMications. The issuesof * following &amenta in ..-- effecton the date of--invitation for bids or rsquestfor prqosal km a part of this standardto the extent ~cified &rein. Federal ..- ------- Stadards. FElE71EH28/1 - Nxrenclatue, Definitions and Letter Symkmlsfor Screw Threads FED-S'IEE28/6- Gages ti Gaging for UnifiedScrew Threads FED-SlWS28/20- Inspection M?tkds forAcceptabili& of UW, ONR, UNJ, M and Ml Screw-Threads (Activities utsidethe FederalGmernnent my obtaincopies of Federal o specifications,tardards, s and ccaurercial itemdescriptions outlineduriler as GeneralInformation the In5ex of FederalSpecifications,%an5ards, in . ad Crammsrcial Item Oescr ions. The Index,which includescumulativebi-nnnthly ipt [email protected] as issued,is for sale on a subscription basisby the Super inten+ ent of Dccunenta, U.S. Government PrintingOffice,Washington, 20402. IX

FIm-s13H128/2B

(Single mpies of this standardand other F&eral specif icatims, standards ad cwmercial itemdescriptions required activities by outsidethe Federal @vernment for biddingp~ses are availablefrcxn the GeneralServices Administration Specification ection,Ftxxn S 6654, 7th ard D Streets,S.W. , Washington, 20407;telepimw?(202)708-9205. CC (Federal C%vermrent activities may obtainaypiesof [email protected] documnts, ad the Indexof FederalSpecifications,tandards, S and (kxnnercial Item Eescripticms fran-est?bliskldistribution @nts in theiragencies. ) 2.2 Other publicatims. `Ills following docummts form a part of this starxlardo the extent~ified t herein. Unlessa specificissue is identified, the issue in effectm date of invitation for bids or requestfor propaal shall apply. AmeriWatimal Standards.

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[email protected] El.1-1989 - Dnified Inch Screw Threads (LIW d ONR Thread a mm) AMI/ASMZ B46.1 - SurfaceTexture- SurfaceFImghneas, wavinessand Lay ([email protected] for rxpiesshouldte a&3ressedto the AmericanSocietyof Wchanical Engineers, UnitedEngineering Center,345 Eakt 47th Street, Wew York, WY 10017or the ArericanNatimal StsndsrdsInstitute, West 42nd H Street,Wew York, WY 10036. ) 3. Definitions. The terms a~licable to this standardare definedin EEEsm-B2&/l . 4. Generalrequiremnts. 4.1 Screw threads. Unifiedinch screw threadssbal.1 in ,arxxx&ce with @ ASMS B1.1-1989ad this FederalStarderd. Qily Stam3ardSeries UnifiedScrew l%rezxls,istedin Table 3A of ASME B1.1-1989,shallbe used for new design for l the FederalServicesunlessprior approval has been grantedby the prmxreuent autlxxi~ to deviatefrom them. Coxae ad fine threadseriesare preferred. 4.2 AcceptabilityScrew threadinspection metl-dsfor acceptabilityhall s lxsin arxxxdance wi~ E'ED-SD+328/20.The requiredgaging systemshallbe specifiedin accordance with that standard. 4.3 Gaqes ad gaginq. Gages and gaging shall be in accordance with FE&51D-H28/6 .

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5.1 Diamter~itch mubinations. When standardsize screw threadsreferred to.. in.4.l.canno.t..lz2. tbe. used,.. designez..kcdddd chaos.e+referred.siz=s of.ti'[email protected] in `1'@.le of M l 3B B1.1-3.989. this is, lf not pssible, onsideration slxxidbe gi.yen the folbi.ng sub-paragraphs the choi~ of to in thread. 5.1.1 Preferredrun-standard diameters. tb?neverpossible,`& ~ diamter stwuldbe selectedEran seriesof dimretarincrements follows: as Diauk?terange r inch 0.25 to 0.6 stove 0.6 to 1.5 abve 1.5 to 6.0 stove 6 to16 akove16w24 First choice increlent inch 0.05 0.1

0.25

Second&sire increumt inch -- .0.05 0.1 0.25 0.5

0.5

1.0

It is rewmrendd that dianetersless than 0.25 inch anform b the standard sizes aa there is virtucdlyno necessityfmr the selection a diameternot of inclded in * sizes. A.1.eo, ax.rseand fine thread series provide ample i+? choiceof `diamstet-pitch ccmbinatkms. 5.1.2 Preferrednrn-standard pitches. 14kneverpossible,ti pitch should be selectedfrcxo aae of the following: 40, 36, 32, 28, 24, 20, 16, 12, 10, 8, 6and4threada per inch. Intermediate pitdieaalx3uMb used only when absolutely necessary. Pitches ccarserthan 4 threadsper imh are not recxxmnmded. The curves slx%n in Figure 2.B.2of -ix B cover the practicaldiaueterlimitssuggestedfor each [email protected] 5.2 Thread class selectia. StandardUnified threadclassesand their applicat~ection 4 of rk5ME B1.1-3989. when selectinga threadclass,consideration skxd-d firstbe given b & use of a class ~ externalthreadwith a.c3.aas internalthreadsince theseclassesare 28 designedfor generaluse. Before specifying class 3M3B series,it met be considered whether the additionalproduct km mst, necessaryfix the tighter fit and toleranm is justified. If a fit Imser than the sbndard class NIB is required,* rm~referred class IAR may be .spsifiedfor an external threadof 16 threadsper inch and marser. This specialclass ombines the largerallowanceof the old AmericanNationalclass 1 threadwith the Unified class n toleranm. See 5.2.2 for class N al.lmenm.

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FEFS1'Mi28/2B for &solete AmericanNationalthreadclasses. When 5.2.1 Replacements threadsspecified with the obsoleteAmericanNationalthreadclassesare to be replacedby unifiedthreads,the following guidelines are provided: a. AmericanNationalclass 1 coarse threadsizes (tK!-l) approxiis matelyequivalent Unifiedclass [email protected] series. C3.aSs fine to 1 threadseries (N&l) is approximately equivalent dirn?nsionally to Unifiedclass 2A/2B series. StandardUnifiedseriesthreads should~, considered prior bJ approvalof replacxznent rzmby sta!xiardhreads. t b. Amrican Natirnalclass 2 rrarse threadseries (K-2), 8 thread series (EN-2) 12 threadseries (12N-2) 16 threadseries (MN-2), , , ad extra fine threadseries (NEF-2) are mxt nearlyequivalent to [email protected], [email protected], 12Ut+2A/Z, 16UN-2A/Z ad UNEF-2A/Z3, respectively.Class 2 fine threadseries (W-2) is approximately equivalent dimensionally Unifiedclass 3A/3B to but the use of class [email protected] series should be omsidered series, prior to approvalof replacement class 3A/3B. by c. AmericanNationalclass 3 seriesK-3, NY-3, FIEF-3, N-3, 12N-3 E and 16N-3 are nest nearlyequivalentb Unifiedclass 3 series UN2-3A/3B, UNF-3A/3B, UNEF-3#3S, 8UN-3A/35, 12UN-3A/3B ad [email protected], respectively, d. There is no Unifiedthreadclass [email protected] the old American Nationalclass 4 which requir~ sel~tive fit of ~ts due ti the pxsibility of interference. "

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5.2.2 Threaddbwance~bleranoa . Mbwances and tolerances specified for sti~~ Unifiedthreadc.la.sses descritedin Secticn5 of A94E B1.1-1989. are Ebr the spscialexternalthreadclass N, tolerances are the sane as fir class 3A and allowsnce are as follows: s Threadspr 16 14 12 10 8 6 4 inch

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Class lAR allowanm inch 0.0018 0.0021 0.0024 0.0028 0.0034 0.0044 0.0064

To ccxrplerrent paragraph5.6 of ?ENE B1.1-1989,reccnmnded tap drill sizes * are hole size limitsbefore threading,for differentlengthsof engagement, incltiedin A-d ix A.

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FEo-mB28/2E 5.3 -tion. Designation Unified screw threadsis in axordanoe of .-- with section6 of AWE B1.1-I.989. tkini.na.l shall be stated in dec~. size Tk symtol~ is appli*e to any thread: ., .... ... . . .. . (1) having the taaicUnified thread form and (2) with limit5based upon Unified formulations serieslisted in Table 3A of

arrl (3) which is not in the s~ard ASM?, B1.1-1989.

5.4 Limitsof size. See section8 of IXiME B1.1-1989for limitsof size of stardardand preferrednm-a~ard threadsand km inbrmation used hr calculation nm-stardard threadsize limitswhich are not tabulated. For of class m, calculateas br clasa IA except allowanceis tabulatedin 5.2.2. The following exanpleillustrates t& prccedurenecessaryto alcul.atethe limitsof size of a mn-starrhrd thread;this follow-she outlinesin tablesIA t and lB of ?x?!MF, B1.1-1989: Externalthread,2.500- 28UtG-2A Lengthof engagement, imh 1 Maximm major diamter = Mxninalsize - a319wlnce (section of ASkE B.I.1-3989) 13 = 2.5000- 0.0014 (frantable 32 of X!& B1.1-1989) = 2.4986 Mininnnn jor diameter. Mdn'nunmajor diameter- tolerm%e m (section 13 of ASME B1.1-1989) = 2.4986- 0.0065 (frantible 31 of [email protected] B1.1-1989) = 2.4921 kiaxinwmitch diamter = Maxinnnn ajor diamtir - h p m (table6, CO1. 13 of FtiN8 1.1-1989) k = 2.4986- 0.0232 (rourded frcxn O.023197) = 2.4754 Minimumpitch diameter M&mum pitch diamter - tolerance = (section of A94E B1.1-1989) 13 2.4754- 0.0056 (frantable 34 of XiFIE B1.1-1989) = 2.4698

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Naninal (mximmn) minor diamter

WXimm major diamter (table6, CCL 15 of ASMS B .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% (table ml; IS ofiU3MEB1:l-19S9) 6; = 12.5000-0.0387 (roundedfrom 0.03866) = 2.4613which is rcundadti 2.461

!.laximum minx diaueter= Minim.nninor dianeter tolerance m + (sectim 13 of ISQZ B1.1-3.989) = 2.4613+ 0.0063 (frantable 39 of ASME B1.1-1989 for lengthof engagement O.43) of = 2.4676which is rourdedW 2.468 Minimumpitch diameter= Nminal size - h _B1.1-1989) (table6, ml. 1! of = from 0.023397 = 2.5000- 0.0232 (rourried = 2.4768 Maximumpitch diameter= Mininunnitch diameter tilerance p + (sectirm of ~ 13 B1.1-1989) = 2.4768+ 0.0073 (frrxnie 37 of ASME B1.1-1989 t = 2.4841 Mdna.1 ([email protected] major = Minimum size diameter = 2.5000 Factorsused in the design of threada,particularly specialthreads,are stiard presentedin -ix B. It is to be noted thatdeviationsfrcan ~ler-s for major diamter of the externalthreadard for minor di.amterof internalthrerdmay be necessaryin order to arriveat th optimumdesign. 5.5 Surfacetexture. sbiill have a smoth finishend te free firm flawsand 5.5.1 l!he ~ other defects,such es fins,nicks and burrs,thatwould make them unsuitable for * purpae intended. 5.5.2 Wdonanahip shall be rrmaistent with the &Jeranms specified herein. Surfacetextureof threadsprodumd b this stamiardshallnot exceed 100 microincharit.betical averageroughness (~) for at threads ~ 63 microinch(~) for rolledard groud threadsin arwith AISI/M?4Z B46.1. WE: c2xrse ad fine pitch threadswith xoughsurfacetextureare tmre likely ends have the least tendency b cross-thread.Threadswith chamferedentering to cross-thread when assembled with pwer tmls.

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E'Eo-sTrM28/2B

5:6 Chrunfer. 5.6.1 All enteringends of externallythreadedfastenersand threaded cqenti _ have 45° Chamfecs (approxhately)frcun inor diameters m or slightly helm mimr diane ters,unlessotherwi~ specified. 5.6.2 All enteringerds of internally threadedfaateners and threaded crspnents shall have nminal 900 -120° countersinks or slightlygreater b than the threadnjor diaueters, unlessotherwi= specified. 5.7 ~lled threads. 5.7.1 C4xrple&lyforud threads. A carpletelyforned thread follows the threadprofile,w~thi.n the toleranceznne over an axialdis=ce of cne pib=h (seefigure2.1). lete formedthreads, 5.7.2 InaaT!P 5.7.2.1 The lead-inthreadis measuredfran tk ed of the product to the start of the firstcaupletet.hceadhere the mjor dianeteris equal b the w minimumati~e major diaueterad the threadrcot is egua.1 the maxiunnn to minor diauetir. This slrxddnot exceed 2P (seefigure2.2). 5.7.2.2 The run-outthreadis neasuredbetweenthe transiticm @nt of the productad the first threadroot which is anpletely formed,where th minor diaueterequals the ue.xinumermissible p minor diamter and the najor diam?ter of the last fully formedthread_ the minimumpenuissible majordianeter. When rcmt radius is specified, 1A? last cmpletely t%rmd rcot at tk minor dieuetermust met the reguireuent. See figure2.3 for full shank fastener, figure2.4 for pitch diauetershank fastener,figure2.5 for shouldertolt, figure2.6 for oversizediametershank fastenerand figures2.7 and 2.8 Jim threafled hed fasteners. to 6. Notes. .-- FED-STD-H28/2A ated d 6.1 ~~rsession note. In additionbJ superseding 20 April 198~~~~-&~nt alrn supersecies AppendixXL of FED-SZD-H28 dated 31 March 1978.

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FED-S'I'&H28/2EJ

+--

r".' WI?,*D

+

I

--+

I

--

--

I

--

-- --

r 6 BASIC MAJOR m

d UIN MAJOR DiA -62 B.UX PITCH CU

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FIGURE 2.1

I

COMPLETELY

`d3MlN I FORMED EXTERNAL THREAO

FOUNDED

ROOT MJNDR VU

w

w

LEAD THREADS = 2P UAX

1

t= FIGURE 2.2 INCOMPLETE FORMEO EXTERNAL

WD

W SI+M

THREAOS, LEAD-IN

THREADS

I

F131-~H28/Z3

q

+----

MAX

RUN"", ~ .2,

mMPL~ ~REMS --

FIGURE

2.3

INCOMPLETE

FORMED

THREADS, DIAMFTER

FULL SHANK

FASTENER -STANDARD

F'=-;ETET"RE

--

-l---

--'

d M!N M4.JOR DIA

I

+ FIGURE 2.4 INCOMPLETE SHANK FORMED THREADS,

f~",~fi

PITCH DIAMETER

FASTENER

9

FECHTE-H28/?B

~MINRuNwT=lp+w.y --

FIGURE 2.5

FULL

SHANK

FASTENER -STANDARD

DIAMETER,

OPTIONAL

CONFIGURATION

(SHOULDER BOLT)

MAX RUN0U7=2P+0VERS12E INCREMENT + z TAWe MIN)

COMPLETE THREADS +

--

t-

km iwNw7. u= +WER SIZE INCREMENT + z Tb.N

12. 35. ~ y !

-1/2 WERSIZE INCREMENT NOTE : e = 7RANs1710N TAPERANGLC

63

---

--

MAX WNDED

ROOT MIMCf7 ou

FIGURE

26

FULL

SHANK

FASTENER-OVERSIZE

DIAMETER

FElHmHu8/2s

E'::::,xT-"

-- -- d UIN MAJW WA

----

w--­ A

FASTENER -THREADED

`d,

MAX RtMSCCD

\~wJTuBK%lw

FIGURE

2.7

FULL

SHANK

TO HEAD

W4DERHEA9 SURFA~ w UAX * 2P +UAX MAX FILLET RAlus ~[z -I_'l.\ \ .~ d, MAX RIXJNSCD ROJT MINCM 91A L I v `+7" TwU.D,A FILLET RADfus W MINs0.6P + MAX FILLET RADIuS mMFu_FE `mF(E4Ds --

1-

FIGURE

2.8

PITCH

DIAMETER

SHANK FASTENER

-THREADED

TO HEAD

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1-l

FED-STD+i28/2B

APPENOIXA TAP DruLLsm AmiamMmKm SCKE SHS?, LIMI'ISEF?M?,i353WW S 5

10. Smpe. ~is a-ix providessuggestedtap drill sizes and recrmmkied hcle size [email protected] prior b firminginternal Unifiedscrew It is not a mandatorypart of tbe standard. The infonrati.m threads. contained herein is intendedfor guidanceonly.

20. `hp

drill sizes.

20.1 General. `Ibassurethat the mirmr d~ter of an internalthreadis heldwithin specifiedlimits,it may be necessaryto use a reamerto finishthe of hole. A varie~ of factorsenters inb the production a clean, mud, straightlmle of tk currectdiameter. For a discussion Mae ad other of data on drillingd @ping, referen~ my be made b "DrilledEoles for Tapping",a publication the UnitedStatesCuttinglbol 11'EtitUtd, of 1230 KeithBuilding,Cleveland, ~ 441J.5.

20.2 !IabU2ated data. 20.2.1 Table 11.A.1gives minor diameterlimitsand correspding percentages thread for s3.2 of staderd series threadsup b @ i.nddiq 3.75 inch diameterfor classesI.B and Z. Teble 11.A. is a similartatd.e or class 2 f ~. These tablesalso list sizes of drills that nay h expectedto drill holes withinor nsar the specified minor diamter limits. Tlxs diameterof the drill, the probableInle size, ard the correepmiing percentages thred are of tabulated . 20.2.2 ~ a drill may mxmal.lybe expectedto cut oversize, probabletde sizesare tabulatedthat are derived franprobablenmn oversi~s, & Mxilated. The followingis quoted fran the ~tionad reprt: `... a seriesof testswas amducted by drill manufacturers.Using six sizesof drillsrangingfrrxn 1/16" to 1" in dianveter, totalof 2,808 holes were a drilledin cast iron ad steel. Regularhigh speed steeldrills ware used with drilli.rq equi~t of the type normallybud in metslmrking shops .... ~ aver~e depth of kde drilledwas equal to 1-3/2 tines the dril..l diemeter. &aeureurant the lmle was made at midpcintof the [email protected] drilled.... of The averageof the. ..aumlntsoversize ..shows a marked increasein arountwersize " for drills largerthan 3/4". For this size range reaming is recrmm&d.

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EZD-SDH28/2B 20.2.3 "Pe&eit of thretilisted in' tablei" t& ratio"A P&& is of the acti heightof tbred to & value O.75H;this value is the basic thread heightof the oblete AuericanNational`l''bread Profile. Since the basic heightof a Ilnif ThreadProfile ie 0.625H,the maximampercent-ied ied t permissibleis 83. 3%. Due to allnwmces ~r drills to cut oversizeor due to lack of availability drills within ~cified minor diametirlimits,tap of drills listed in tables11.A.1 d 11.A.2nBy sbw greaterthan 83.3% threads. This indicatesthat the drill size is smallerthan the minixm.rn threadminor diameti arxl additional ~hin~ of the hole my ha neoesearyin order to permit ecommlicaltapping.

30. ,Rermm'd d

tde size limitsbefore threadinq.

30.1 Genera+. Rx short lergthof engagement,the imle diam?~ reouired prior. threadingslmti be held near the minimmnlimit to nnximise th&ad to height for maximumjoint strength. AS lengthof engageurmtincreases, is it advantageous trJincreasetbe bok di.amterfor uore e&mcunical** with less risk of tap breakage. Therefore,* followingreccammdaticaswere developed (alsosee 30.2 telow): Lenqth of [email protected]?nt Upto

and incltiing 0.33D

Minimm Eble Size --.--. M.iniumminor dia

MasinumEble Size --------

Mn

minx dia plus 3/2 minor die tilerarce

Atove 0.33D Abve

0.67D

thru

0.67D

Min m.imr dia plus l/4 minor dia tilerti.in mi.mr dia plus 1,/2 mina dia tilerance Min mimr dia plus 3/4 minor dia tolerance

i+lin minim dia plus 3/4 minor dia tolerance Max minor dia (reinirsx m dia plus tolerance) Max mirmr dia plus l/4 -r dia tolerance (see30.2)

thru 1.S) 3.OD

Atove 1.5D tkll

Fran the foregoingit will k seen that & differen~ betweenlimitsin each range is the w and egud to half of & minor diametertmlersome. This is a generalrule. B'xever,the minimumdifferen~s for si~s below 0.25 in. are equal b the minor diamtir tolerances given in tables39 and 40 in ASME B1.1-1989for lengtheof engagementto and including O.33D. i%r lengthsof engagement greater than O.33D for sizes 0.25 in. ad larger, the mininucn values are adjusted sc that the differencebtween limits is never less than 0.0040 in.

13

FED-STD-H28/2B 30.2 l'abulated d= Recomnmded hole size limits for stadard LJnified 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.rm minor diaueterad tolerancefran table 3B of ASME B1.1-1989, calculatein or aaardanos-withsectian of ASME-Bl.q-1989 8 ushg' Spprcpfate toleranoefran table 39 or 40 of lSKE B1.1-3.969 for toleran~ ratioof `1or frrm firmlas b [email protected] 5.8.2 of B1.1-1989. Tabulatedhole sizes ad Imle sizes calculatedin accordance with 30.1 are not mrdatory unless the thread designation statesthe ndified minor diarreterimitsard & designation l MXl in accordance with paragraph6.7 in ~ B1.1-3989. If mdified minor diameter limitsare not specf ied, acceptancewill be in acrmdance with stardard minor diameterlimits.

threads

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Ncn!E: ~ed maxinnnnole sizes in 30.1, for lengthsof engagsrmk h greatertha 1.SD are outsidestarxiard minor dianeterlimits. They are not incltisdin tables11.A.3and 11.A.4. Use of a minor diamter hrger than standardwill result in a reductionin shear area of the externalthreadsof the mating part. If manufacturing processpermits,maxinznn ole size before h threading skuld ke maintainedat the high eti of the stardardmi.mr diameter limits. 30.3 Other ccmsiderations.When tappingrelatively soft materials, especia~--f i.ne pibch threads,there is a terdencyfir the materialto be squeezeddown towardsthe rrmt of the tap so that the minor diameterof the tappedhole uay .berxwre smallerthan the diameterof the drilledtnle. It may be necessaryto try a differentsize drill or differentstyle tap to assurea satisfactorythread. ...

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--____

.

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. j

m

15

FED-STD-H28/2B

x

In I-

& II

u

0

16

.: :,,

17

FEESTD-H28/2B

18

E%&SlEH28/23

--

--

--

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FED-Sl''D-E.28/Z0

--

--

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-- -

--,

--

-- -- I

--

11

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.+

In

0

20

Fm-s'llH128/2B

--

--

4.+--

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.......... -----

#-l . . ..-..-

=i-

++.4 . . ..-. ~-++--

....

--

21

FED-STIH128/2B

`1

-.4..-.

4.+

.+-.A.

4+-.-!".

--

~w%=--

.++-. . .. . .

. ..4+.-.

m

+-

I

22

1

II

I

1 !--

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

I

~ I

I

I

i

i

I

I I

1`

II

I

q

.j

515Wl 2°3

N

0+

L-1

n

ii

29

FEW5TD-H28/2E

1111

m

--

ii

--

I

30

F311-STD-H28/ZB

0

31

Fl?QSTD-H28/213

i

I

I` II

I'11

s s

32

EED-ST13-E28/Z3

5

.

imm

S'

---

33

EED-S'IT2-H28/2B

`2nsLs 1.A.3 ~ 1 ~le

size lim2fs tefore threading for different lergt.hsof e!qaqsrr?nt, stm3ard

Unifid ad saa? UtG threads, c3ds.se6IB and 272 (see 30.1) IJ

--

minx di=ter Sm.iml size in fncb22 ard thteds &Er kc!) Series designatim Percmd of tied 3 ~ .06C+0 or M. 0-44 Ow 0.0465 .0561 .Osao .0667 .0691 .0764 .0797

ox

of internaltieais

PmmY

of

nueed 5 in 0.0514 .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 59.1 58.5 61.6 a.o 62.8 64.0 64.7 64.7 64.0' 66.2 64.7 R 65. B 65.4 65.6 65.7 65.3 65.1 66.5 66.2 64.7 64.7 64.0 63.7 66.3 65.9 65.4 65.7 65.3 66.5 66.0 66.5 66.2 H 6

1

2

4 83.1 83.3 83.1 83.2 83.3 83.5 03.2 83.4 83.5

53.0 S?.7 32.7 53.0 52.7 52.6 53.9 55.7 56.2

.07344 or M2. l-a .073-72or h. 1-72 .08+56 or f&. %56 .006-64or N2. `WJ4 .099-48or m. .099-36or M. 2-48 3-56

mc

Ufw

.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 .250-22or .250-32or .250-36or 3/4-20 2/4-20 L/4-32 3/4-36

LaF

.0049 .oa94 .0979 .1004 .104 .22.3

M

83.8 83.1 a3. i3 83.1 83.1 83.8 83.1 24.1 83.8 83.1 84.1 83.0 83.1 83.8 83.9 64.1 83.0 a2.5 84.5 63.8 a3.1 63.1 84.1 a3. B 83.1 83.5 83.1 a3.9 83.0 82.5 83.1 E3.1 83.6 83.1 04.1 83.8

Lx

UNF

.130 .234 .145 .356 .171 .177 .182

OK

w

mc

13m

LmP Uw Luc 2am w 2WN CKm w

.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

w

2Cm Cm 2m UMT ma

ox

16U4 w 32m .50C-22or .500-13or .500-16or .50C+20or .500-38or .50C+32or 3/3-12 2/2-13 W-16 3/*Z 3/3-2E U2-32

See fmt730tes e at

of table. 34

q

limits for diftesent; AtlYM 0.330 &" Htntlmml o.6m

*

of ~t !4dna3 s!= in *

M0m3 0.670 thru 1.53!

mxifm

B 2n

UlnImm 9 10 in 0.0514 .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

adt.hreadsperird

mximxa

32 1

0.&65

.0563 .0560

in

0.0479 .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

0.0500

.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

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

In 0.0514 .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

.060%0as m. M30 .m~~ m. I-64 .07>72 or lb. 1-72 .086-56 b. 2-56 OK .086+4 b. `N4 or

.03+48 or b. 3-48 .099-56or lb. ?-% .2M-40 or m. 4-40 .3X4-48or m. 4-48 .125-40or m. .32s-44or m. .138-32or m. .238-40or m. HO 5-44 6-32 6-40

.0667

.0691 ..0764 .0797 .0849 .0894 .0479 .1004 .104 .332

.230

.134 .145 .156

.164-32or lb. +32 .164-36ox b. 6-36 .390-24Or b. .39C-32or h. .216-24or .OZ .236-20 .236-32or .350-m or .230-200s .25*32 or .250-26or 3125-1Sor 3125-20or 3125-24or 3125-26or 32Z5-32or 3125-36or .375-16or .37>20 or .37>24 Or .375-20or .37532 or .375-36or 8375-140[ 1375-16or wrf-m or or 137s-22 137>32 m 50c-12or or .50C-13 ,500-16 or .Soo-m or .500-22or .50C-32m

h m.

lb24 10-32 12-24 12-32

.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

m. P26

3/4-20 2/4-20 3/4-32 2/4-36 5/36-32 5f16-2c 5W24

5/16-26

5/36-32 V26-24 3/S16 3/8-20 3/6-24 3/2-22 3/S32 3/S36 7/3.6-14 7/36-16 7/26-20 7/36-22 7/M-32 2/2-12 3/2-13 3/>16 3/2-20 3/2-28 2/2-32

q

See

fcotnotes end of table. at 35

!1

~STEH28/2B `B&E 11A.+=

kamx%x3ed txzhzsize limits tefore threadiq for diffezent krqths of engiqemnt, Unified u-d safe UNS thzea&, chsses D and 2S (see 30.11 IJ - untinkd sbrdard

q

Nminal size

Fm5threads

in inches per inch

Series designatim

Fer03mY of lhread

2/

Uaxiirmn

Percent.Y

of l?uead

3 in

.5625-12 or .5625-16 or .5625-18 or .5625-20 or .562524 or .5625+20 or .5625-32 or 9/26-32 9/26-16 9/36-18 9/16-20 9/16-24 9/16-28 9/16-32 Inc .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

4

6

.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 67.o 65.9 65.8 65.4 65.6 65.7 65.3

mm

w

cmc3-

2mN 3am w 2.3U? 16UN l.uw 20026 m 2mN 33U4 12UN lam m 20UN K322F 285S 3mN m 127JN w? m w 26UN 3mN 3mN 12UN us ..oNir 2m 3ZM

83.6 83.1 83.8 e3.9 84.1 . e3. o 82.5 83.0 83.1 83.0 83.1 83.1 83.1 84.1 83.8 83.6 e3.1 83.8 83.9 84.1 e3. o 82.5 B3.1 83.1 83.8 83.1 e3.1 84.1 83. B 83.6 e3.1 83.8 a3.9 83.0 e2.5 e3.1 83.1 e3. o 93.8 83.1 e3.1 84.1 e3.8 e3.6 e3.1 83.9 e3. o 82.5

. 625-u or 5/8-11 .625-12 5/8-12 or or .625-16 5/8-16

.625-3.8 at .625-20 or .625-24 Or .625-28 or .6&32 or 5/8-18 5/8-20 5/8-24 5/8-28 5/8-32

66.9 66.5 66.5 65.1 66.2 64.7 64.7 64.0

67.0 65.9 65.8 65.4 65.6 65.7 65.3 67.0 66.5 66.5 65.1 66.2 64.7 M.o 67.o 65.9

.6875-12r o .6875-16 or .6875-18 or .687+20 or .687+24 Or .687528 or .6875-32 or . 75C-10 3/4-10 01

.750-12 .750-16 .750-18 .750-20 .750-28 .750-32 or 3/4-12 or 3/4-16 or 3/4-18 or 3/4-20 or 3/4-28 m 3/4-32

q

65.8 65.4 65.7 65.3 67.2 66.5 65.7 66.5 65.1 66. ? fd.1 64.0

67.0 65.9

`

.875-9 C: 7/8-9 or .875-12 7/8-12

.875-14 Or .875-16 or .P75-18 or .875-20 or .87S28 or .875-32 os 7/0-14 7/8-16 7/8-18 7/B-20 7/8-28 7/8-32

Luc 12UN w Mm m m 261m 32m 12L2+ lam m 2mN 32UN ale .

.9375-12r 15/16-12 o .937516or 15/16-16

.937>20 or 15/16-20 .9375-28 or 15/16-28 .937532 or 15/16-32

65.4 65.7 65.3

q

*

fmtnotes at end

36

-s273-H28/2B ?S+?JZ 11.A.3-. .= ---

&mmenkd ble size lfmfts bebre thrediq for different lengths of erqqanent, IRS threaas, d855es D and 2S (see 30.1)1/ - mxmina .=. . Unified ad m Ikzk size limits &r different h Ith of mgag.3Tent

sbdard

Reccmrer&d

-

Abw 14axflmm 8

0.330 till 0.67D

AkNe o.6m till1.5D

tbina.1 size fn inches

ard thre&2s per inch

Minilrm 7

in

Hir.imm

Ma%h.m

10 fn u in in 3.2 1

9

in .4n

.472 .495 .502 .508 .517 .524 .529 .527 .535 .557 .565 .571 .580 .5s6 .591

.591 .620

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

.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

.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

.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

.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

.5625-2.2 9/26-22 or o .5625-16r 9/26-16 o .5625-2Br 9/26-18 or .562E-2o 9/1+20 .562524 or 9/M-24 o .5625-26r 9/!lG2B .5625-32 9/16-32 m 5/B-31 or .625-3.2 5/6-12 .625-16 or 5/S-16 .625-18 5/S-lB OK or .625-20 5/s-20 or .625-24 5/0-24 .625-2B or 5/0-23 .625-32015/S-32

.625-3.3 or

""

.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

or .750-10 .750-12 m or .750-16 or .750-2.s or .750-20 or .750-2S .750-32 or

3/4-10 3/4-12 3/4-16 3/4-18 3/4-20

3/4-26

3/4-32

or .B125-12 13/16-12 .6225-16 r 13/16-16 o or .52.25-2.613/26-3.8 or .B3Z5-20 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

.782 .766 .794 .806 .B14 .B21 .827 .840 .845 .856 .877 .BB9 .903 .907

.836 .842 .847 .870 .883 .899 .904 Ses

.889 .903 .907

.937512m 3.5/16-12 o .9375-16r 3.5/16-16 .9375-200235)26-20 .9375-26 2s/26-20 m .937532or 25/16-32

fcotiotes end of table. at

'37

i?EESTD-H28/2H

[email protected] ~ . ..-. . , -. ._- _>. . bb:e bk SiZ limits 3222ifie3a793 -3x9th2'ea, threading br different lerqths of qpt, ~ ls30Ya2E (see30.l)y-mtti . . dkza P&ma & 1 1.000-8 1.WC-U 1.ML=14 1.-16 1.*23 1.-29 1.000-26 1. WO-22 m lZM 14221 w mm 2mnl 1.12S-7 1.2258 1.125-22 1.223-16 1.125-2s 1.123-20 l.mia 1.26758 1.ls7512 1.387S-16 1.2237+.0 2 1.1675-20 1.2B7>i$ w lM 3 .86S .92a .922 .932 .940 .966 .961 .966 .927 .972 .985 .995 1.002 1.009 1.024 0.970 .990 1.023 1.057 1.065 1.071 1.096 1. 0s2 1.097 3.220 1.127 1.233 1.149 4 83.1 83.1 63.0 83.0 83.1 83.1 84.1 83.8 03.4 .83.6 83.5 83.1 83.8 83.9 83.0 83.s 83.1 83.1 82.9 83.1 83.1 84.1 B3.4 83.6 83.1 83.8 83.9 83.0 83.5 83.1 83.1 83.6 83.1 83.1 84.1 83.4 83.6 83.1 83.8 03.9 03.0 82.1 83.1 83.1 83.0 83.1 83.1 84.1 E3.4 83.4 83.6 83.1 83.8 83.9 83.0 83.1 83.3 83.1 a3.a 83.1 83.1 64.1 5 .890 .93s .92a .946 .952 .957 .970 .974 .952 .930 1.OCII 1.009 1.023 1.020 1.032 0.99B 1.035 1.052 1.071 1.078 1.C82 1.095 1.077 ` l.lls 1.124 1.140 1.145 l.m 1.222 1.140 1.170 1.1% 1.203 1.2m 1.220 1.202 1.240 1.259 1.265 1.270 1.282 3.223 1.265 1.303 1.32) 1.328 1.333 1.343 1.Z8 1.327 1.365 1.384 1.390 1.395 1.407 1. 3S0 1.390 1.4'23 1.466 1.453 1.457 1.470 o 3 W.run& s-d

q

.%;

66.3 65.9 65.8 65.4 65.7 68.4 67.7 66.5 6?: 66.2 64.768.1 67.0 65.9 65.8 65.4 65.7 60.4' 67.7 66.5 66. s 65.1 66.2. 44.1 68.1 67.0 65.9 65.0 65.4 65.7 69.3 67.7 66.5 66.5 65.1 66.2 64.7 69.1 68.1 67.0 65.9 65.0 65.4 65.7 69.3 67.7 64.5 66.5 65.1 66.2 44.1

E mol

2a31 w ml m if% am

LR 1.160

1.182 1.190 1.1% 1.232 1.177 1.222 1.245 1.252 1.269 1.114 1.195 1.240 1.283 1.3L77 1.32.5 1.37.2 1.334

1.33256 1.3125-12 1.317S-16 !.. 3U5-18 1.3125-20 1.3223-in 1.31.375-6 1.37+13 1.37516 1.37+18 1.375a 1.375-28 1.4315-6 L.4375-8 1.h375-22 1.437+16 1.437>19 1.437+20 1.4375-20 1.5U-6 l.sowe 1.300-12 1.500-16 1.500-10 1.500-30 1.500-28

m lam 161.31 w 2cul Zmm m m ma

s

2M34 2mm

Q.N m+ 1224 = 2m14 lmc 6m 13w

Ll&$

201J4 26W

See

fczhotes at end of tihle.

38

F3%D-STD-H28/2B

11.A.3Rxxxmended ble size lSmits kfore threadfng for dif Eerent leqtb of [email protected]?nt, stamkxd Unified ti sme UKi threti, classes 3B and = (.93.3 30.1) 3J - .xzztimzd b2s aim lkks fordiftermt kq?im of ~t P&W 0.6792tuul.m

q

;. `~ m

ad inchdiq (1.3D 14inlmn Kaxim3a 8 .865 ..910 .923 .932 .940 .946 .962 .944 .927 .972 .903 .993 1.002 l.om 1.024 0.970 .990 1.03s 1.037 1.065 1.072 1.066 1.032 1.097 1.120 1.227 1.331 1.149 1.095 1.2.25 1.340 1,,+22 1.290 1.196 1.231 1.177 1.222 1.245 J.252 1.258 1.274 1.195 1.240 l.im 1.307 1.335 1.323 1.336 1.257 1.302 1,347 1.370 1.377 1.303 1.399 1.3ZI 1.365 1.410 1.432 1.440 1.446 1.461 .877 .939 .932 .939 .946 .9S2 .9+6 .9m .940 .901 .993 1.002 1.009 1.014 1.02a 0.984 1.002 1.044 1.CU 1.071 1.077 L090 1.26 1.106 1.227 1. U4 1.239 1.M3 1.109 1.127 1.169 1.109 1.296 1.202 1.22.6 1.199 1.233 1.252 1.259 1.264 1.275 1.230 1.2s2 1.2W 1.314 1.332 1.327 1.340 1.272 1.32s 1.356 1.377 1.384 1.389 1.403 1.335 1.377 1.429 1.439 1.446 1.452 1.666

Mvvc 0.3m thru0.67D 6baimm M .871 .914 .927 .936 .943 .9i9 .%3 .94a .926 .9n .909 .998 1.W6 1.023 1.026 0.977 1:% 1.041 1.066 1.074 1. 0s8 1.0$9 1.102 1.223 1.230 1.136 1.231 1.302 1.ul 1.164 L 266 1.293 1.199 1.223 1.184 1.227 1.24S 1.236 1.261 1.276 1.m2 1.246 1.'209 L323 1.330 1.324 1.338 1.265 1.3oa 1.352 1.373 1.260 1.386 1.401 1.327 1.371 1.414 1.426 1.443 1.449 1.463 end

.804

~b u

.8n .929 .931 .939 .946 .9S2 .%6 .970 .940 .981 .993 1.M2 1.004 1.014 1.028 0.964 1.002 1.044 1.064 1.071 1.077 1.090 1.065 1.206 1.127 1.134 1.139 1.233 1.109 1.127 1.169 1.189 1.296 1. m2 1.216 1.290 1.231 1.252 1.239 1.264 1.278 1.220 1.252 1.294 1.314 1.321 1.327 1.340 1.272 1.323 1.356 1.377 1.384 1.389 1.403 1.335 1.377 1.429 1.439 1.446 1.452 1.466

12

.890 .929 .92a .944 .9s3 .957 .9m .974 .962 .990 1.003 1.009 1.023 1.020 1.032 0.996 1.035 1.053 1.071 1.076 1.022 1. 09s 1.077 ::s 1.140 1.145 1.357 1.323 1.140 1.1-68 1.396 1.203 1.207 1.2m 1.m2 1.240 1.259 1.265 1.270 1.2E2 1.225 1.265 1.303 1.321 1.3.29 1.332 1.365 1.288 1.327 1.365 1.384 1.390 1.395 1.407 1.330 1.390 1.420 1.446 1.4s3 1.457 1.470

1 1.000-s 1.000-12 1.00C-14 1.000-26 L.mu 1. O*2O l.oocl-z 1.029-32 1.0625-4 1.0625-32 1.06zr14 1.0625-16 1.06S36 1.oa5-iQ 1.0625-26

.923 .934 .943 .949 .954 . 96E .972 .946 .9S6 .?97 1.m3 1.032 1.017 1.OXI 0.991 1.00B 1.048 1.066 1.074 l.ozn 1.093 1.071 tE 1.137 1.142 1.355 1.116 1.334 1.173 1.393 1.199 2.204 1.220 1. L96 1.2% L235 1.362 1.267 1.200 1.229 1.230 1.29s 1.326 1.324 1. 33S 1.343 1.-280 1.321 1.361 l.zao 1.387 1.392 L. 405 1.343 1. 3S4 1.422 1.443 1.449 1.456 1.466

1.12.5+9

q

1.250-7 1.250-6 1.250-12 1.25*16 1.2s2-20 1.2s0-20 1.25C-2E

1.375-4 1.37 S-8 1.37s-12 1.275-36 1.375-38 1.27s-m 1.27S-2E 1.4275-6 1.4375-6 1.4375-12 1.4375-16 1.4s73-28 1.4375-2U 1.4m528 1.50C-6 1.500-8 1.300-12 1.500-16 1.500-lB 1.5oo-m 1.500-26

Seef

notes

of able. 39

-

IIA.3- ~ .~.

Mif+edald

tie size liaits sfnre b thrediqh different Jxqths of~:, 6uIlew4hreadS, c38sses 231am53s (see30.1) lJ-amtinw2

Mm? diam?teto]

,terral tb s

s m

Nmina2iai

zefnfnctrs al'dthreadsperincb 1

WIes designatim

2/

Haxim.m 3 M 4

5

I%m2el#

of `nueFd 6

2

fn 83.4 83.4 83.6 83.1 83.s S3.9 83.1 83.1 83.1 83.8 83.1 63.1 83.4 S3.4 83.6 83.1 83.8 S3.9 83.1 E:: 83.1 83.8 83.1 83.4 83.4 83.6 83.1 83.9 S3.1 83.1 w 83.1 83.4 S3.4 83.6 83.1 83.9 83.5 83.1 83.1 S3.1 83.8 83.1.

"1.423

1.5625-6 1.5625-8 1.5625-22 1.5625-16 1.5625-3S 1.5625-20 1.625-6 1.625-8 1.625-32 1.625-16 1.625-M 1.62S-20 1.6875-6 1.687>8 1.6s75-12 1.6S75-16 1.6s75-3s 1.6675-20 1.750-5 1.75f+6 1.750-8 1.750-12 1.75C-16 1.750-20 1.62.25-6 1.U25-8 l:ux-lz 1.8125-16 1.822s-20 1.87 S-6 1.8758 1.87512 1.87516 1.875-20 1.9375-6 1.9375-8 1.9373-U 1.937516 1.9375-20 2.000-4.5 2.000-6 2.000-8 2.000-12 2.000-16 2.OW-20

m? m lzw m2t4 m SJN m 1224 Mm mm 2om4 mN liutl 1s2!4 20UN m m SLm lam mn4 64E4 m mm

Mm

1.382 1.427 1.472 1.495 1.s02 1.s08 1.445 1.490 1..s35 1.557 1.565 1.571 1.507 1.552 1.s97 1.620" 1.627 1.633 1.534 1.570 1.633 1.660 1.682 1.696 1.632 1.677 1.722 1.745 1.759 1.695 1.740 1.785 1.807 l.szl 1.757 l.aoz 1.847 1.870 1.883 1.759 Lam 1.865 1.910 1.932 1.946

40

1.452 1.490 1.509 1.52s 1.520 1.47s 1.52.s 1.553 1.571 1.578 1.5S2 1.53s

1.5n

69.1 66.1 67.0 65.9 65.8 65.4 69.3 67.7 66.5 66.5 65.1 66.2 69.1 67:; 65.9 65.8 65.4 70.1 69.3 67.7 66.5 66.5 66.2 69.1 6s.1 67.0 65.9 65.4 69.3 67.7 66.5 66.5 66.2 69.1 68.1 67.0 65.9 65.4 ,

-

1.635 1.634 1.640 1.64s 1.56s 1.600 1.640 1.678 1.696 1.707 1.663 1.702 1.740 1.759 1.7m 1.72s 1.765 1.s03 1.821 1.832 1.788 1.827 1.865 1.884 1.895 1.795 1.850 1.BSO 1.92s 1.946 1.9s7

q

2om tm4 m Dm la 20UN 6m4 WN MN 161n4 20UN m 60N 8ot4 H

*

fmtnotes at end of tible.

3'Ec-s213-E28/213 msl.z 11.A.3- ~

---Imle size limits &tire threading for different leqths of eqeqenent, Lh-llfied-LW threads, c2a59e9 2s and m (see 30.1) y - atillu33 st.addrd

P. ..s

f bok

eim Mmitsz differentlength of engagent tir

1

2b &d incluihg o.33n

Atove 0.330 thru 0.67D

AtUW 0.67D thnl1.5D

Nminel size in inches

Flt-f3thmadsprincb

in 1.382 1.427 1.472 1.49s 1.s02 1.s09 1.445

1.490 1.535 l.sn 1.565 1.571 1.507 1.S52 1.597 1.620 1.627 1.633

in 1.40s 1.446 1.486 1.s05 1.53.2 1.517 1.460 1.508 1.S48 1.563 1.574 1.ss0 1.530 1.571 1.631 1.630 1.637 1.642 1. S59 1.s93 .1.634 1.673 1.693 1.704 1.655 1.696 1.736 1.755 1.767 1.72E 1.750 1.79B 1.818 1.830 1.780 1.821 1.861 1.B80 1.892 1.786 1.043 1.B84 1.923 1.943 1.954

IF

2.3

14inimun

22 .fn 1.423 1.452 1.490 1.509 1.525 1.520 1.475 1.525 1.553 1.571 1.578 l.saz 1.s38 I.sn 1.625 1.634 1.640 1.645 ::% 1.640 1.678 1.696 1.707 1.663 1.702 1.740 1.759 1.770 1.72s 1.765 1.803 1.WU 1.832 1.788 1.827 1.865 1.884 1.s95 1.795 1.8s0 1.890 1.928 1.946 1.9s7

1

in

1.397 1.440 L 481 1.s02 1.509 1.s14 1.460 1.502 1.544 1.564 1.571 1.577 1.522 1.S65 1.606 1.627 1.634 1.639 1.S50 1.ss5 1.627 1.669 1.6s9 1.702 1.647 1.690 1.731 1.752 1.764 1.710 1.752 1.794 1.814 1.827 1.n2 1.s35 1.E56 1.877 1.8s9 1.777 1.835 1.877 1.919 1.939 1.952

1.390 1.434 1. 4n 1.498 1. S06 1.531 1. 4s2 1.4% 1.539 1.s61 l.sa 1.574 3.535 1.558 L 602 1.623 1.630 1.636 1.s42 ~.sn 1.621

1.397 1.440 L 401 1.502 1.s09 1.514 1.460 1.s02 1.s44 1.s64 1.571 1.577 1; 522 1.56S 1.606 1.6?) 1.634 1.639 1.5s0 1.5s5 1.627 1.669 1.689 1.702 1.647 1.690 1.731 1.752 1.764 1.710 L752 1.794 "1.814 1.827 1.772 1.835 1.856 1.8n 1.8s9

1.777

1.S625-6

1. S625-8 1. S625-22 1.s625-16 1. S625-18 1.562S-20

I

1.625-6 1.625-B 1.625-12 1.62+16 1.62S-18 1.62S-20 1.687Fr6 1.687S-8 1.687512 1.6875-16 1.6875-18 1.607s-20 1.750-5 1.7s&6 1.750-8 Z.750-12 1.750-16 1.750-20 1.812s-6 1.RU5-S 1.8125-22 1.0U5-16 1.8125-20 1.87M 1.875-8 1.875-12 1.87S-16 1.87520 1.9375-6 1.9375-8 1.9375-12 1.937516 1.937>20 2.00C-4.5 2.000-6 2.000-8 2.00C+12 2.000-16 2.000-20

1.534 1.570 1.6U 1.660 1.602 1.696 1.632 1.677 1.722 1.745 1.758 1.69S 1.740 I.78s 1.807 l.ml 1.757 1.802 1.847 1.870 1.883 1.759 1.S2U 1.86s 1.910 1.932 1.946 See

1.664 1.686 1.699 1.640 1.684 1.727 1.748 1.761 1.702 1.746 1.789 1.822 1.824 L 765 l.wa 1.8s2 1.873 1.s.86 1.768 1.827 1.871 1.914 1.936 1.949

I

1.835 1.877 1.929 1.939 1.952

faJtnotes em3 of table. at 41

Ew-s'Iwz28/a

.=,

2%BtZ 11.i3 ;-.~ lmle size MmLts bebce thswding for different lerqths of eq&&nt, Unified and mre W thretds, Cf.fl d m (sse 30.1) ~ . -&* a

star&JKd

q

~simininches ?lrdthre.adsperirch

sxies des igmatim

2.062!+16 2.125+ 2.U+6 2.225-12 2.3.25-16 2.225-20 2.3E75-16

2.250-4.s 2.250-6

=lF

2 3 in 1.995

ml

k

Mi

Ikmentv

Mi.nimm

&

4 5 in 83.1

83.1

6

2.0U3 1.975 2.02s 2.o53 2.071 2.082 2.334 2.045 2.100 2.267 2.517 2.767 3.017

65.9 69.3 67.7 66.5 66.5 66.2 65.9 71.0 69.3 71.7 71.7 71.7 71.7

mm

16U4 XKR4 lx w Sam

Um

1.945 1.990 2.035 2.057 2.071 2.la3 2.009

2.om

83.1 83.1 83.8 83.1 83.1 83.5 83.1

:::

2.5C4)-4 2.% 3.000-4 3.250-4

See botmtes

WC m

at E-X3of table.

2.229 2.479 2.729 2.979

83.4 83.4

q

I

I I

I

I

42

L

FE23-STD-I?28/2B

.-.

~ m bale siza 3.fmiteti different L

. ­­--

ard fm2h251ng 0.330 IIAbve

0.3m thfu 0.67D Mlxilmm Nfnf2mn

2-3 23 h

!kmfnalaizef.nti

Ludthretdspximll

6uldms0

7

M82icd0nfniam 8

9 fn 1.998 1.952 1.996 .2.039 2.061

2.074

10

1

in

1.995 1.945. 1.990 2.035 2.037 2.072 2.320

2.009 2.070

in

%

in

2.005 1.96E 2.008 2.048 2.060 2.060 2.230 2.036 2.093

2.254 `2.508 2.756 3.008

in

2.002 1.%0 2.002 2.044 2.064 2.077

2.127 2.027 2.085

2.002 1.960 2.002 2.044 2.064 2.077 2.227 2.027 2.065 2.240 2.498 2.748 2.998

2.009 1.975 2.025 2.053 2.071 Z. C&? 2.334 2.04s 2.100 2.20 2.517 2.767 3.017

2.0625-16 2.3.25-4 2.=8 2.125-12 2.323-16' 2.12?+

2.3S7%16

2.322 2.03.8 2.077 2.239. 2. 4a9 2.739 2.989

2.250-4.s 2.250-6 2.300-4 2.750-4 3.oco-4 3.=0-4

q

~

2.22s 2.479 2.?39 2.979

~~yg

2.240 2.498 2.746 2.998

Liu3mgth90f be.limits.e qud m tb Anc.r dimcu~ tdermxs =Jw==t-~ gredter than 0.33nin Sims 0.25 in. Ibever, * minikam v83ues -r lengths of aqagewmt 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 dun in this @da

dimcet.ec-piti ccmbfnatims which * -t ~ prcdded them is a diareter~imh ux&dnatim

fn this W fn ths tabki

my

k

*--

M

M

Of

(1) b-itht6=cuImpimbm3

(2) with~ dtik

thatis lessty m fntegm2 tmnmt &m

0211S: Values In *

tb dfmrebr+ti

vabm aze &sized, this pq2192. )

table fur mninn3

" carhna tfm fm which ka3e sizs sizes 2ess ttmn 0.25 in. c9m0t be used far

E2P2KlW lb cbtain * values for * 4.0*S2E or = thread, ad `17)esaalue.quuld thm ~: v Uueadslxamh t!mtahle. 3.890. m PCrmlas of thread Wu.2 Zemfn Imchmlpea. 2J B.mA cm .Ue2. . randed off

2.000 b n2WS &r * 2.000-5N 3.865, 3.877, 3.871, 3.B84, 3.877,

in

tke prhirq

.lum.

100 perumt of threzd - 0.791 [see 30.2.3).

[email protected]

tntlt?mmdrtal ditureter.

43

FED-ST13-H28/29

7mmE 11.?+.4 ~EX7 -

Imle sizelimitsbeforethreadiq h different kqtb Onifiedd s=e W tbreds, * 3B [see30.1)~ ?linor iambx of inte~ d

of mgagment, st.ard 9 ~e

Per02ntY

of

I "a I

*r ies Iesignatim FercentY of Thread

Y 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

`1'nread

I

1 .060-8001lb. 0-80

.073-64 or N2. 1-64

3 trw

Lrc

4

6 53.0

I

in 0.0465 .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

83.1 83.3 83.1 S3.2 83.3 83.5 83.2 83.4 83.5 83.4 83.3 83.8 83.1 83.8 83.1 83.1 83.8 83.1 84.1 83.8 03.1 84.1 83.8 83.1 83.8 83.9 84.1 83.0 82.5 84.5 .93. e 83.1 83.1 84.1 83.8 83.1 83,5 83.1 83.9 83.0 82.5

.073-72 tb. 1-72 or

or .086-56 No. 2-56 or .086-64 No. 2-64 OK

m

IRK

53.0 52.7 53.6 53.9 55.7 56.2 57.9 57.9

59.1 59.7 62.8 62.1

.099-48 M. 348 or .099-56 lb. 3-56 or

or .122-40 b .3X+48 or M. 4-40 4-48

m?

UK Um

.125-40 m. or .12544 or W.

5-40

544

m

02-F

. 13S-32or b. 6-32 or .138-40 No. 6-40 .164-32 M. %32 or

.164-36 or W. 8-36

w

Lw UNF

q

.2.90-24 No. 10-24 or or .290-32 N& 10-32 .216-24 M. 1%24 or .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

w

W Low

63.7 63.8 65.2 65.3 65.3 66.7 66.8 66.8 m.1 68.6 ::; 68.5

68.5 66.7 70.0 69.7 69.0 69.8 69.2 69.0 ,.

m

UK InfF OtEf

w o-m 2UIN 2671N m m `K 20UN UNF 2euN IilJm m m 16UN m 327RJ

at d

,

.4375-14 .437>16 .4375-20

.431!+28 .4373-32 * fwb-des

70.9 70.8 70.7 69.8 69.2

"o

of tah3e.

44

FED-S2D-H28/2B m15LE 11.A.4- ~ed

.-.

Wmmm5ed

tde size limi= tefore threading for different lengths of eqag-t,

unified ard 6are IN *e&, ck 3B (see 30.1) y - amtinued

sbdard

--

bsle size limits for different length$ of aqagenent

..

txnfm.1size in incks ardt&ead6periJlctl

m a-d fnchdij-lg 13.33D

~ti

W

0.33Dth?uo.6m

Abve 0.67Dthcu1.5D

Mxiumn

W.%ium 7 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

at eti

9

~

10

u

~

32

1

~

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

See

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

of table.

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

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

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

.062-s0 or

lb.

0-80

.073-64 tb. 1-64 or .073-72 tb. 1-72 or .096-56 W.. 2-56 or or .086-64 w. 2-64

.099-48 or &a. 3-48 .099-56 or W. >56

.2X+40 or M. 4-40 .3.32-4.9 f&. 4-48 or .125+0 or W. .225-44 or m. 5-40 -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

foomotes

45

FE&STD-H28/2B

`3m3L2 11.A.4 - Wc$mmcm2& hzle size limits before fhrezdirqfor differentlqtba Onified ad s.ne 11+3ttuewfs, ck15 ~ (662 30.1)~ . ~~~ .- -. .:

of eqqemsnt,

starctard . .

Ninor diaseterof internrd rim NOniml size in incks ad threads pm M *5 ies desiccation --7 Percena

of 17xecd

naximm

1

2

3 ~

4

5 in

6

.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

0?s w lam

.4100 .4170

.43m .4460

3aN

.4620 .4660 .4720 .49s0 .5020 .5080 .5170 .5240 .5290

83.1 83.1 83.B 83.1 84.1 03.8 83.6 83.1 83.8 83.9 64.1 83.0 82.5 03.0 83.1 83.8 B3.I 83.1 B3.1 B4.1 B3.8 83.6 B3.1 83.0 83.9 24.1 83.0 82.5 B3.1 E3.1 83a 83.1 83.1 54.1 83.6 83.6 83.1 83.8 B3.9 83.0 82.5 E3.1 B3.1 83.0 83.8 63.1 83.1 04.1 83.8 83.6 B3.1 B3.9 83.0 02.5

.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

71.8 71.1 71.6 71.3 69.0 69.2 72.2 72.1 71.9 71.3 70.4 69.8 69.2 72.7 72.7 72.4 72.1 71.3 70.4 69.8 49.2 13.0 12.8 72.1 71.3 70.4 69.B 69.2 13.5 73.3 72.9 72.1 71.3 69.8 69.2 73.5 72.9 72.1 71.3 69.8 69.2 74.1 73.7 73.5 72.9 72.1 71.3 69.0 69.2 73.9 72.9 71.3 69.8 69.2

Lx

12LX

lam

32LN lm

.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

Zm 331m m 120N U6P IRS m

. 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 See fa.tnotis at d

16xm m w 2m 3am ioc

,

U&N

w 16m 13f65 2WN 3212.'

lam

2olN 32m of table.

46

2?IB2.E 11.A.4- ~ [email protected]=o

mamlti

lde size limits tefnre thseadiq fnr different Zerqths of e!qqe7rent, stzdard Uoified ad sme M *e*, * 3B (= 30.11 ~ - afi~

---Im2e size limits 20? different h h of engagmt II `"

*

0.33D

Ak&

0.33Dthru0.670

mximm 8 in 511

`Junimm

9

10

~

~

~

.4160 .4226 .4371 .4497 .4636 .4679 .4703 .4994 .W65 .5122 .5204 .5261 .5304

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

.4100 .42m .43m

.4460 .4610 .4660 . 47m .4950 . som .5080 .5170 .5240 .5290

.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

.U29 .41%

.4347 .4477 .4620 .4665

.4192 .4234

.4395 .4517 .4660 .4705 .4813 .5017 .5066 .5142 .5226 .5285 .5330

.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

.4753 . 49n .5043 .5102 .5186 .5245 .5290

.5298 .5377 .55% .5669 .5727 .5622

.5670

.5270 .5350 .5570 .5650 .5710 .5800 .5660 .5910

.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

.59L5 .6001 .6219 .6294 .6352 .6436 .6495 .6540 .6449 .6626 .6644 .6929 .69n

.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

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 .8700 .8830 .0990 .9040

.712U .7165

.7254

.nii

.7602 .7745 .n90 .7580 .7874 .8000 .8094 .8169 .8227 .8370 .0425

.0699

a

.8739 .8852 ,8995 .9040

47

--

lSi3U? 1.A.4- [email protected] 1 Me sizeM&its bzforethreadfrq fordifferent lerqthz qagemmt, scacdacd of .Mfied md ~ ~ t32re2&, chzss33 (see30.1) - -~~ IJ ,. . . z. Hirnr dimreterof internaltk.s s

Wdl-la3 size In inches aldtlu.xrMper&ch 1

q

5sr ies

Lkignrttim

2 3

Fwca-.&

of

2/

16ZL131US

FerQntY

of nued 6

`nuerd 4 5

in

1.000-8 l.om-lz 1.000-14 1.00U-16 I.me-u 1.Ore-20 l.mo-a 1.OCC-32 1.0426-0 1.0632?-22 1.0623-14 1.0623-16 L.0625-26 1.062!+20 1.06.2!+26 1.225-7 1.123-s 1.325-32 1.12S-16 1.US-1a 1.12.%24 1.226-28 1.2.S7H 1.2s73-12 1.167>16 1.1876-16

1.367 s-m 1.1873-26

w

LP2F m lWN UmP 2m Jam

.8650 .9100 .9230 .9320 .940d .9460 .9610 .9660 .9370 .97m .9850 .9950

loom 1. Oow

83.1 83.1 83.0 83. B 83.1 03.1 S4.1 83.8 63.4 83.6 83.5 83.1 83.B 03.9 83.0 e3.5 83.1 83.1 83.8 e3.1 83.1 84.1

.E797 .9198 .9335 .9400 .9600 .9531 .9676 .97L9 .9623 .9823 .9940 1.0033 1.0105 1.0162 1.0303

74.1 74.1 73.8 72.9 72.1 71.3 69.8 69.2 7d.1 74.1 73.8 72.9 72.1 71.3 69.8 -34.1 74.1 14. L 12.9 72.1 71.3 69.8

1.0240 m Km W4F lm m [email protected] 2S.7N m lm la w 2um mc am LQr 1.0320 :.0970 1.1200 1.1270 1.1330 1.1490 1.0950 1.1150 1.1600 1.18m 1.1900 1.1960 1.2110 1.1770 3.22m 1.2450 1.2520 1.2528 1.2740 ma am m lKN UNm `3uLN 2m7N a m Uz31 lQ.7N mm Zfxm 2MN 1.39s0 1.2400 1.2850 1.3070 1.3160 1.3210 1.3360 1.25'70 1.3020 1.3470 1.3700 1.3770 1.3830 1.3990

83.4 83.6 83.1 63.s 83.9 83.0 83.5 63.1 83.1 83.8 03.1 23.1 84.1 a3.4 83.6 83.1 03.8 83.9 03.0 83.1 83.1 63.1 83,8 83.1 63.1 84.1 83.4 83.4 03.6 83.1 03.6 83.9 83.0

1.0672 1.1073 1.12S3 1.1355 1.1U2 1.E51 1.3125 1.1297 1.169S 1.190s 1.3980 1.m37 1.2176 1.3.922 1.2323 1.2533 1.2KD5 1.2662 1.2801 1.2346 1.2547 1.2948 1.315=9 1.3230 1.32s7 1.3426 1.2771 1.3172 1.3573 1.3703 1.2855 1.3912 1.4051

74.1 ?4.1 72.9 %: 69.8 14.1 74.1 14.1 72.9 72.1 71.3 69.8 74.1 74.1 72.9 72.1 71.3 69.S 74.1 74.1 74.1 72.9 72.1 71.3 69.6 74.1 14.1 14.1 72.9 72.1 71.3 69.6

1.350-7 1.LE.O-8 l.mu 1.250-16 I.nc-in 1.250-20 1.250-26 1.3226-8 1.3326-32 1.3225-16 1.3123-24 1.3125-20 1.3323-26 1.37+6 1.373-8 1.376-12 1.373-16 1.373-18 1.375-20 1.373-28 i.4373-6 1,4315-8 1.4373-12 1.4375-16 1.4373-38 1.4376-m 1.4376-20

see

lRN

mm' 2m

fwbwtes

at erd

tie.

48

22!&E 11.A.4 ; ~

tule Size limits befnre thre.dq 13nifiedad snm W thzezdz, c3dss 3 Iule size Ltiits for differentk

@r different kqti (3ee 30.1) lJ - m~~

of engqeuent,

stardard

~ of~t

AtOw o.6m tflc" 1.50 !linimm 32 mximm 12 .8:7 .919B .9335 .9408 .9400 .9537 .9676 .9729 .9422 .9833 .9940 1.0033 1.0105 1.0162 1.0301 0.9075 1.0047 1.0448 1.0658 1.0730 1.0787 1.0926 1.0672 1.1073 1.1343 1.1355 1.1412 1.2551 1.2225 1.1W7 1.1698 1.1908 1.1980 1.2037 1.2176 1.2922 1.2323 1.2533 1.2605 1.2662 1.2801 1.2146 1.2547 1.2948 1.3158 1.3230 1.3287 1.3426 :.2771 1.3172 1.3573 1.3783 1.3855 1.3912 1.4051 1 1.00+8 1.000-12 1.00W14 1.00v-16 1. OM-lS 1.000-20 1. OW-26 1.000-12 1.0S5-9 1.062S-12 1.0435-14 1.062516 1.0635-18 1.0625-20 1.0625-28

, .,

bird size in fnches ard threadsPL?ri.mh

m

d

Inclldlng0.320 mximm

)JDve 0.330 thru 0.670 Rlnim.m 9 .8:4 .9123 .9269 .9344 .9U9 .9477 .9620 .9665 .9309 .9748 .9874 .9965 1.0044 1.0102 1.0245 0.9747 .9934 1.0373 1.0594 1.0669 1.0727 1.CS70 1.0559 1.0998 1.1229 1.1294 1.3352 1.1495 1.0997 1.3284 1.1623 1.le44 1.1929 1.1977 1.2120 1.1809 1.2248 1.2469 1.2544 1.2602 1.3745 1.1996 1.2434 1.2873 1.3094 1.3169 1.3237 1.3170 1.2622 1.3059 1.3490 1.3719 1.3794 1.3852 1.3995 Faxham 10 fn .8759 .9173 .9293 .9387 .9460 .9517 .9660 .9705 .9364 .9798 .9918 1.0012 1.0085 1.0142 1.02$25 0.9833 1.0009 1.0423 1.CK37 1.0710 1.0767 1.0910 1.0634 1.1048 1.1i52 1.1333 1.1392 1.3.335 1.1083 1.1239 1.1673 1.1887 1.1960 1.2017 1.2160 1.1884 1.2298 1.2522 1.2585 1,2642 1.2785 1.2096 1.2509 1.2923 1.3137 1.37.:0 1,3267 1.3410 1,2721 1.3134 1.3548 1.3762 1.3835 1.3092 1,4035

Mnimm 7

8

.0s2 .9148 .9271 .9366 .9440 .9498 .9645 .9691 .9347 .9773 .9B96 .9991 1.0065 1.0123 1.0270 0.9790 .9972 1.0398 1.0616 1.0690 1.0748 1.0095 1.0597 1.1023 1.12U 1.3333 1.1373 1.2.520 1.1040 1.1222 1.1648 1.3.s66 1.3940 1.:998 1.2345

.8:0 .9100 .9220 .9320 .94M .9460 .9610 .966o .9270 .97m .9850 .9950 1.0020 1.0020 1.0240 0.9700 .9900 1.0350 1.0570 1.0650 1.0710 1.0860

.8%. .9148 .9271 .9365 .9439 .9497 .9636 .9679 .9347 .9773 .9896 .9990 1.0064 1.0123 1.0261 0.9789 .9972 1.0398 1.0625 1.0689 1.0747 1.0886 1.0597 1.1023 1.3240 1.3314 1.1372 1.2.5U L.1039 1.1222 1.164s 1.3S65 1.1939 1.3997 1.2136 1.1847 1.2273 1.2490 1.2564 1.2622 1.n61 1.2046 1.2472 1.289S 1.3133 1.3M9 1.3247 1.33B6 1.2671 3.3097 1.3523 1.3740 1.3814 1.3872 :.4011

1.125-7 1.3258 1.12512 1.22516 1.125-3.6, 1.125-20 1.133-28 1.1875s 1.3675-12 1.187516 1.2272-32 1.1075-20 1.3.87+28 1.250-7 1.250-0 1.25C-12 1.350-16 1.2X-18 1.250-20 1.250-28 1.3125-8 1.31>12 1.312516 1.31~25-le 1.312520 1.3135-28 1.375-6 1.373-8 1.375-12 1.37516 1.375-18 1.375-20 1.375-28 1.4375-6 1.4375-E 1.437+12 1.4375-16 1.4375-18 1,4375-20 1.4375-28

l.lno 1.2220 1.2450 1.2520 1.2ss0 1.2740 1.1950 1.2400 1.285o 1.3070 1.3150 1.3210 1.3360 1,2570 1.3020 1.3470 1.3700 1.3770 1.3030 1.3990

1.1047 1.2273 1.2491 1.2S65 1.2623 1.m70 1.2046 1.2472 1.2098 1.33.36 1.3190 1.3248 1.3395 1.2671 1.3097 1.3523 1.3741 1.38s 1.3873 1.4030

I

I

e See fcotmtes at end of *e.

49

I

FED-S'IWH2i3/Z3

Imle size limits &fore thretiimg for different lerqths of erqagecent, stamdrd `27WLE11.A.4 - maurendd Unified UX5 scue m thmaka, * 38 (.802 30.1) ~ . ~tin~ .- -. .= . . .. nternd thred3 fAmina3sizo b, Ltis C.n5threadspesindl

%, ies im designat

2 5

Y

9wmltY

of

mrezd 6

~

1.5470-6 1.500-8 1.50C-32 1.500-16 1.600-28 1.50C-20 1.50C-28 1.5635-6 1.5625-6 1.5625-12 1.5625-16 1.5625-18 1.5625-20 1.625-6 1.625-8 1.625-13 1.623-16 1.625-18 1.625-3Q 1.6875-6 1.6875-8 1.6875-11 1.6875-16 1.687518 1.6875-20 1.75C-5 1.750-6 1.75C-8 1.750-12 1.750-16 1.750-20 1.B125-6 1.8125-8 1.Lu26-12 1.8125-16 1.8125-20 1.m25-d 1.6325-6 1.8125-22 1.6225-16 1.0225-20 1.9375-6 1.9375-0 1.9375-12 1.9375-16 1.9375-20 2.00C-4.5 2.000-6 2.MO-8 2.000-12 2.000-16 2.000-20 2.0623-16 UC

L3 83.1 83.1 a3.1 03.8 03.1 83.1 84.1 63.4 83.4 03.6 83.1 83.8 83.9 83.1 83.1 83.1 03.8 83.1 83.1 03.4 83.4 83.6 83.1 83.8 83.9 83.1 83.1 83.1 83.1 83.8 03.1 83.4 83.4 83.6 83.1 83.9 03.1 83.1 83.1 63. s 83.1 83.4 83.4 83.6 83.1 03.9 03.5 83.1 83.1 83.1 83.6 83.1 83.1 1.33% 1.3791 1.63s8 1.440a 1.4480 1.4537 1.4636 1.4023 1.4422 1.4823 1.5033 1.52n5 1.5162 1.4646 1.5047 1.5448 1.5659 1.5730 1.5787 1.57/1 1.5672 1.6073 1.6383 1.6355 1.6h12 1.5575 1.58% 1.6297 1.6698 1.6908 1.m31 1.6521 1.6922 1.7323 1.7533 1.7662 1.7146 1.7547 1.7940 1.815% 1.8287 1.7771 1.0172 1.8573 1.8783 1.B912 1,7061 1.83% 1.8797 1.9298 1.9408 1.9537 2.0033 74.1 74.1 74.1 72,9 72.1 71.3 69.8 74.1 74.1 14.1 72.9 72.1 71.3 74.1 14.1 74.1 13..9 72.1 n.3 74.1 74.1 74.1 72.9 72.1 71.3 74.1 74.1 14.1 74.1 72.9 71.3 74.1 14.1 74.1 72.9 71.3 74.1 74.1 74.1 72.9 71.3 74.1 74.1 7<.1 72.9 71.3 74.1 74.1 74.1 74.1 72,9 71.3 72.9

ox

W8 [email protected] 16WN m m

1.3200 1.36S0 1.6200 1.4320 1.4400 1.4460 1.4610 1.3820 1.42m

1.47m 1. 49s0

m

&m lmll la In&P 2L2m

l.zom 1.5080 1.44;0 1.4900 1.5350 1.5570 i.%% 1.5710 1.5a70 1.5520 1.5970 1.6200 1.627o 1.6330 1.5340 1.s700 1.6350 1.6600 1.6am 1.696o 1.632o 1.6770 1.7220 1.7430 1.7580 1.695o 1.74m 1.7850 1.8070 1.8210 1.1510 1.8020 1.8470 1.8100 1.8830

m

12LN

lam

ml

2LI.54

13W+

lam

L% mm

lam

2ow4

m m m

lam lam

201M

1.7590 1.820U 1.S650 1.9100 1.9320 1.9460 1.9950

w

Se8 fcotnotes at ez-dof talzk.

50

FEE+lD-H28/2B

`mEG? 11.X.4 - ~

q

--~ed

bale size 1 hits before threading for different lengths of engagement, starxkd Unified ard U2G threa5s, class 30 [see 30.1) ~ - -t~~

--

hale size [email protected] k

fur difierent 1, 0.33D W" 0.67u

Ch9 of engagemnt P&W 0.6772 thm 1.50

NAn?.1size in &s ard thmods per tih

Minimm

UAnnm

7"

in 1.3200 1.3650 1.4100 1.4320 1.4400 1.4460 1.4610

? ~

1.3296 1.3722 1.4148 1.4366 1.4440 1.449e 1.4645 1.3922 1.4347 1.4773 1.4991 1.5065 1.5123 1.4546 1.4972 1.539e 1.5616 1.5690 1.5?48 I.wf L.5597 1.6023 1.6241 1.63= 1.6373 1.5455 1.5796 1.6222 1.6648 1.6e66 1.6998 1.6422 1.6847 1.7273 1.7491 1.7623 1.7046 1.7472 1.789e 1.0116 1.8248 1.7671 1.8097 1.8523 1.e741 1.0873 ~.nn 1.8296 1.8722 1.9148 1.9366 1.9498 1.9991

10

12

~

1.3246 1.3624 1.42.23 1.4344 1.44L9 1.4477 1.4620 1.3871 1.4309 1.474e 1.4969 1.5044 1.5102 1.44% 1.4934 1.5373 1.5594 1.5669 1.5727 1.5222 1.5559 1.599B 1.6239 1.6224 1.6352 1.5395 1.5746 1.6184 1.4623 1.6844 1.69n 1.6371 1.6809 1.7248 1.7469 1.7602 1.6996 1.7434 1.7e73 1.8094 1,E227 1.7621 1.8059 1.0498 1.n719 1.B852 1.7661 1.8246 1.e6e4 1.9123 1.9344 1.9477 1.9969

-

m

1.3346 1.3759 1.4173 1.A387 1.446o 1.4517 1.466o 1.3971 1.4324 1.479e 1.5012 1.5085 1.5142 1.4596 1.6009 1.5423 1.5637 1.5?10 1.5767 1.5223 1.5634 1.6048 1.6262 1.6333 1.6392 1.5525 1.5S46 1.6259 >.6673 1.6887 1.7017 1.6471 1.6884 1.7W8 1.7512 1.7642 1.71796 1.7502 1.7923 1.8137 1.8267 1.7721 1.8134 1.e548 1.8762 1.8892 1.7194 1.0346 1.8759 1.9173 1.93e7 1.9517 2.0012 1.;96 1.3723 1.414B 1.4365 1.4439 1.4497 1.4636 1.3922 1.4347 1.4773 1.4990 1.5064 1.5322 1.4S46 1.4972 1.539e 1.5635 1.56e9 1.5747 1.5171 1.5597 1.6023 1.6240 1.6314 1.6372 1.5455 1.5?96 1.6223 1.6640 1.6865 1.6997 1.6421 1.6047 1.7273 1.7490 1.7623 1.7046 1.7472 1.7e9a 1.8125 1.s247 1.7671 1.0097 1.8523 1.8740 1.8872 1.7728 1.8296 1.8722 1.9148 1.9365 1.9497 1.9990

~--

1.3396 1.3797 1.4198 1.4400 1.44ed 1.4537 1.4676 1.402L 1.4422 1.4822 1.5033 1.5105 1.5162 3..4646 i.5047 1.5446 1.5658 1.5730 1.5787 1.5271 1.5672 1.6073 1.6263 1.6355 1.6422 1.5575 1.5E96 1.6397 1.6698 1.6908 1.7037 1.6522 1.6922 1.7323 1.7533 1.7662 1.7146 1.7547 1.7940 1.8L54 1.8287 1.7771 1.8172 1.es73 1.a783 1.8912 1,7861 1,8396 1.8797 1.9196 1.9408 1.9537 2.0033 1.50 C-6 1.500-8 1.50C+12 1.50C-16 1.500-18 1.500-20 1.5oo-2e 1.5625-6 k7625-e 1.5625-12 1.s623-16 1.562518 1.56>2S

1.2s20

1.4270 1:4720 1.4950 1.5020 1.5080 1.4450 1.4900 1.5330 1.5570 1.5650 1.5710 1.5070 1.5520 1.5970 1.62U0 1.6270 1.6330 1.5340 1.5700 1.625o 1.6600 1.6820 1.6960 1.6320 1.6770 1.72X 1.7450 1.7580 1.6950 1.7400 1.7850 1.8070 1.82L0 1.7570 1.0020 1.8470 1.8700 1.8e30 1.1590 l.ezoo 1.86s0 1.9100 1,9320 1.9460

1.625-6

1.625-8 1.623-12 1.625-16 1.623-32 L.625-20 ` 1.607H 1.6075-.9

1.6275-12 1.687$-16 1.6675-18 1.6675-20 1.750-5 1.75+6 1.750-8 1.750-12 1.75C-16 1.75C-20 1.8125-6 1.8125-8

q

i. e225-12 1.822%16 1.0L25-20

1.S15-6 1.e75-8 1.e75-12 1.87S-16 1.875-20 1.9375-6 1.9315-8 1.937>12 1.9375-16 1.9373-20 2.000-4.5 2.000-6 2.000-0 2.000-12 2.0K+16 2.000-20 2.0625-16

q

1.9950

see fmlnotes at end of m.

51

EED-sm-H213/273

l!ALu.2 11.A.4

-.

-"R&rrrdd

hole size limitstefare threadingbr differentlengthsof erqag~nt, st.artiard Lhifiedad = W *e*, .=3d69 (* 30. Y - [email protected] = U tiI Minimum diameterof internalthreads

q

Fercentv

of `Iluead

Ferrem &

of Tluead

2.125-6

2.325-8 2.12522 2.125-16 2.125-20 2.1875-16 2.250-4.5 2.250-6 2.500-4 2.750-4 3.000-4 3.250-4

6rJN II

3 in 81R4. Mm Mm 2orm 1.9450 1.9900 2.0350 2.0S70 2.0710 2.1200 2.0090 2.0700 2.2290 2.4790 2.7290 2.9790

4

s

6

h.

83.1 83.1 B3.1 03.8 83.1 83.1 83.5 83.1 83.4 83.4 83.4 83.4 1.9646 2.0047 2.0448 2.0658 2.0787 2. 12S3 2.0361 2. 0!396 2.2594 2.5094 2.7594 3.0094

74.1 74.1 74.1 72.9 71.3

72.9

II w

II %

74.1 74.1 74.1 74.1 74.1 74.1

II=

see frxsnotes at eti of Gable.

52

FED-Sl'lH28/2E

w m

23.A.4=~ -~ TO ad iIY%u3~

Me sim limits bfnre thredhq focdifferentqtb of tcq~k, k onifbd8rL2g=tkell&,c&M 2a(00e30.1) J/-amtillw2d --

bale slm 0.3~ Mni& different luqttm of ~ -o-~til,= II

~

II [email protected]

0.3~ t&U 0.67D

[email protected]

26nLimmll Mnioma

7

10 32

in

1.9s63 L.9P73 2.0396 2.0616 2.0766 2.3300

h 1.96% 1.99M 2.03n 2.0554 2.0721

h 1.95% 2.0009 2.0423 2.0637 Z.om

in

1.9546 1.9977 2.039s 2.0635 2.0747

in

1.9644 ZO047 2.OUB 2.0656 2.0787 2.2293

2.Xu-4

2.22s-8 2.32s-3.2 2.225-16 2.225-20 2.387+3.6

2.2262 Z.mn 2.07%

II 2.3229

II 2.0361 2.0746

2.3262 2.0294 2.cm6

2.2539 2.5039 2.7539 3.0039

2.3260

2.0226 2.07% 2.2444 2.4944 2.7444 2.9944

2.2C90 2.07m 2.2m 2.4790 2.7m 2.9790

2.0263

2.m%

i

3f21=dlffe2am bmlht=arecq+dbthemkr

hSM3hlg o.3m. ~,t.b~mluesbr

d hrocr am pitch ~tmti 2k.3eslw

m

2.2594

2.5094 2.7596 3.0094

II

2.250-4.5 2.2s0-4 2s00-4 := 3.*

II

dXbr2rhr-fc

c3aytlmofc~t

bad

thsn o.3m in SIZZ2S 0.25 tn. klgthaoc UqagaEnt gmlk ti5t62 - tkt Um differertm ~tbeen lidtn is 2eso tkm 0.0060 tn. Fur dbsee other * t.lm9B given in this t8b3e, mc 30.2. thiatah2e mlyhc&lMrledbyuR0s tbtaae!

Mmiil125(21rRta?r+tctl .adi=laticmahtlk QrMrin 41Lbr0tq va.bs&this wpm96&2u!er9 iwadk~ikheilnthmin

(1) Ulthtbmpiaml

[2)wiuladi=mtAE ttmtis3es9 bianintI?911J cuultuwal [email protected] 0itbdt5!EtH-Qiml a&iMtimti oimk?sdtbml.ooin.~ 14ucb & tin ~ are &sired. ou3z:vahua 3nt.tmtabf0rmalna2 trJw05&tMdpu6me.)

~i m*taint&. va2mdf0rt& 4.0m3-m3+m thremf. U3f 2.OQO In S2.2m ti &e [email protected] tkueti 6kam 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. ~.cau&d Offint.hpr&irq mlum. 100 prxcsnt of thred - 0.75B (m 20.2.3).

~8aw2.m

53

l?EIF.SSD-H28/2B

--. --

APPENDIXB

[email protected]~

I

40. ~. fiis apg=dix prwides guidelines which rcay be used in the parts. It is not a rnardatory design of unified screw threads for threaded

of the standard. The information IXX-Itained herein is intended for guidance

part

only. It supplements informstim rnntainedin ApperdixB of [email protected] Bi.1-1989.

50.

50.1

I

General.

Intrcductim. In

I

I

general,any given prcblem in threaddesignmay te [email protected] tO ==~ mre or less Satisfacbxy sdutiona based on the preljndnary selecticnof certainelem?ntaof the designand the prcper In other mrds, threaddesign is to a large adjustmnt of the O* elenmw. extentempiricaland is partiallybasedon previouse~riene with similar designsad the j~nt of & designer. [email protected], it is not practicable to presenta definitesystemof approachto the designof a threadedassembly but nrely b presenta discussia of variousdesign factirs.

50.2 Factor relationships.The interrelation f lengthof engagement, o minimmnmajor diameterof the externalthread,maximumminor diameterof the internalthread,ard the [email protected] of the assembledthrecdneeds to be urriersbrrl ti carefullyconsideredin order to produce tlm? optimumdesignof a specialthread. It is not eccmunical use either a [email protected] of threadergage ta uent which is longerthan required @[email protected] than thatwhich will davelopthe full strengthof the externally threaded member. Other factors,such as controlof tap breakage,prcparseatingof a threadedpart on a sbcul.der, the preventirm cross threading, of omditicns of loadingwhen the assenbl.d parts are not concentric, SIXI passiblecollapseof a hol.lcw xternally e threaded mmber, requirecarefulanalysisti adjustmnt of the design with respectto selection the diameter-pitihurbination, of c the classof thread,lengthof en9a9~nt, and major and minor diametertoleran=s.

q

50.3"Thread fit consideratims. A close fittingthreadassemblytier acme Ccrr3iticns fail,whereasthe causeof failuremsy k elimina&d by may providinga Icoser fit. A cap screw that seats only on one side of the tearing surfaceorder the hea3 may breakoff when the screw is tightened. Wken a screw has a largetearingsurfacetier the head or when the head must be squarewith a projecting pin, sufficient pitchdiameterclearance must be providedto allrw for any out-of-aqdareness the screwaxis with the bearingsurfaoeurder the of head. Thus, as largea pitch dkuretertoleran~ as pcssible,togetherwith providingproper tolerances squareness face with the threadasis where on of seatingis reguired, may avoid the necessityfor specifying heat treated a tmlt.

I

54

??Eo-s!m-H2e/2B

50.4 .Staniard threads. use of standardthreadsis reguiredin accordance with 4.q Information preferredsizes ad classesbr .sp3cia2hreads on t 7-- appeSZSin 5.1 and 5.2. Wheneverpracticable, lengthsof engagementfor cc.srse, ine, 4, 6 and 8 threadseriesshouldbe tetween5 pitihesf 1 l/2 diamters; for all other seriesthey shouldte' betwsen"5" @ 15 pitches. A&i= theseprincipleswill help keep costs of nwinufatire ad gsging

60.

mtriciti

of as-ly

and cross threadinq. of "O .375H,0.75H h H.

Note: Tat& 6 of Xi&E B1.1-1989 inch.deetabk.s

parta

In aesemhlyad use, tk crxrbiredkmnces k ad armarms on both mating shouldnot allow threadsto disengagecm o= side W&en assemblyis eccentric. I'& axis of the internalthreadcan be displacedradiallyfrrsa coinc~with *asisofth ex=nalthread byamaimuntequd totheaum of the pitch dizureter olerances t ard the alkwame. This radialdis#acement may be sufficient that the flankom~t = is entirelycm one side ad on the opposi~ side the crest of the externaltbre~ will bs. in line with tl-e crest

the sti uternal a ~sition in thread in a with [email protected] the following hole: (1) results There * will & * screw danger is constrained of aossiq the in

of

starting,iux3(2) the screw may @ out of the tole when tensionis exertedin this constrained ~sition. The minimumanuuntof overlapis arbitraryaml controversial, tit the followinggeneralrule can be used in lieu of mre specificdata:

threads

* the first step to assure tk minim.nn safe overlapon hth sidestin the assemblyis amcentr ic, the difference be~ tl'e minirmmmjor ditmeterof the externalthreadad the n!axti minor diamter of the internalthread slmld not te less than twice the addendumof the externalthread (0.75E). O*rwiae stated,the sum of the major+ iaretertolerance and allowsnce,if any, of the externalthreadad the minor-diameter tolerance the in&xnal of threadshouldnot be greaterthan 4/3 the addendumof thz externalthread, 0.5H. This provides tir a minim.mof 50 percent threadengagement. As the aeccnd step, to assure that mininunsafe overlapon one side when the assembly is ~tric, tte differencebetweenthe nbsximumitch dianeterof the internal p threadand th? minimumpitch di.amterof tk externalthreadshouldnot be greaterthan the basic threadheight (O. 625H). otherwisestited,the ~ of the pitch-diareter tolerances troth of threadsand the allowance,if any, should not be greaterthan the basic tfueadheight (0.62513). his providesfm an T ecxx?ntric assemblyccmditionequal @ half the beic threadkight (O.3225H) and zeromini.mmoverlapon cme side. If the resultsfrcm the limitsof size selectedviolate & atmve rules,the toleran~s shouldbe reducedby using a closerclass of tolerance, assumingtolerances consistent with nnnufacturng i pxsibility, or a marser pitch shouldbe used to increase the amunt of overlap. The nujor~iameter tilerance the esternalthreador minor-diameter of toler~ of th [email protected] not te less than the pitch-d iareter tolerance tk respectivethread~ maintainthreadform. Also, it shouldbs of noted that, if the tolerance the minor diarreterf tbe internalthreadmust on o neeeearily be large, &s nmjor diameterof the externalthreadmust be held close to the msxinummajor diameterad vice versa.

55

FED-SID-i128/2B

70.

.-Str

engtb

factors.

that externally threade3 psrts 70.1 Tensilestressarea. Testa have * fail, tensinn.at in lnads [email protected] in *, of xntbreaded.parb. nitb diamters midway betweenttx?ir itch & minor dtiters. Formulas (la)and p (lb)in table 11.B.1providestress area tased upn a diameterapproximstdy midwaytetkeenmininnnnitch diameterand mininn.nn p minor diamter. These formulas have been applifsluccessfully steel. s kY and otier nY2b.Ls ith ultimate w strengthsup to 180,000psi and are often used for productacceptance.mile stressareas for s=ard sizes are tabulatedin section11 of = B1.1-1989. 70.2 Shear areas at minixmnnaterial. The gatric m s~ar area of an in~ threadat minimxnmaterialis ecaual tb? area of that tbreulwhich to is intersected by a qlider with a dians&r equal to tbe mininm najor diareterof the [email protected]'nal threadover the length of engagznt. This is identified figure2.B.1for a one pitch secticmad formuhs (2S)and (2b) in in table 11.B.1are used for calculation. Simil.srly, gemretricaheararea the of an externalthreadat minimummaterialis equal tm the area of that thread which is intersected a cylirderwith a dianeterequal IXJ by the maxiusnn minor diameterof the mating internalthread. `I?& is also identifiedin figure 2.B.1 for a one pitch sectionam5 firnndas(4a)and (4b)in table 11.B.1are used for Calculatiral.

,.

56

FED-sTD-H28/2B TABLE 11.B.1 Formulasfor screw threadstrengthfactors

1-

FED-!31!wIi2e/2B

TABLB

II.B. 2

Formulasfor screw threaddesign

mrmfd Rferem= [email protected]

90cmlh

mmbm

Kfuueeter

iat ic

[f-l)

Iuuilc

~

I (23) ~

exwrnally

Btresa, `zxterd.fy prt - We fmsim

% -:. a

5:.5:+5

km

(b) ~

(M)

70.6

tii2a

tfueafd

.t.mM,

prxt

&

70.6

I I I

2 WifbSt - ? 0.7654~d+w]

+E

I I

I

[13) Ialgthof ~ rl?3ngEerlt fssrdltul. * fAilLUC 0~ ..&d r.?-

""*g

0, 6A: fzm (,d) ~ (fb)

70.7.3

ad Intellnl fbra 3A; frm (3A)or (lb] (M]

laq'tbOf 0qag5mtfssmdqm

W

of extxrnc.1 thread

m.

.W. fts 2A" fzlxl (k.) or (fb) fcus Na) or (w

70.7.4

(M)

of ergLgrs51t fused up [email protected] fu12 tendle tieqth of exturn, t.hmrd Wifb tfuti qt -ic Si'Z3 - W vitb [161

[email protected]

12--~ M tms

70.7.5 frmd Mb) \

[16)

m*Ofew+f==ntwA?arofintmnalfmuld

Iz-Izfrcm[Elx

LEEu ~ m

%7.5

(9)

isgremcrtfml k ) ,

I

I

fbmtim: dpim - mfnimnl mlmr dirllmtic, external thcead, flat

form (-

K+inl . im=h.

xndmub

dh . me

diawter,

dl.nin-d+-~fl-d~-~ [12), eat.crrmlly tfxe?ded put, inch.

If tic, is M tie, db - Q

58

FEtWlWH28/2S

I

sEmoNmMIN,M"M

SHEAR AREA OF TNREAD INTERNAL

I

I

I

m

MAXIMUM MINOR OIAMETER OF lNTERWAL TNREAO

thread

""'"' `

MINIMUM MAJOR OIAMETER --

OF EXTERNAL TNREAO

70.3 Shear areaa at basic size. The gearetric*ar area of an exkwnal a=ic size is equal to tke area of a basic size threadwhich is intersected a cylinderwith a dianeterequal to the basicminor diameter. by Formulas (6a)and (6b)of tible11.B.1are used fir calculation. `Fhs gecznetr ic shear area"ofan ~te&al threadat tasic size is not ordinarilyused for calculations. Shear area simolif&~ formulas. `mnnulas (3)and [5) in -le 11.B.1 are sinipli fied fornud.asor Internal ad external thread shear areas. They are f based upn aqirical dati ad give shear areas whichvary frmn the gecan?tric -s, test dab agreesnxxe clmely minimummaterialshear areas. In sczne with thesesimplifiedformulashearareas than with gecmstricsheer areas.

70.4

59

FED-S'i'WH2E/2B 70.5 Shear area, cabined failureof externaland internalthreads. When the mstfng externaland internalthreadsare a parts Imnufactured fran mater ialsof a~roximstely equal strength,failurewill usuallytakeplace in toth threadssimultaneously.Thread bendingduringfailurecharxp the thread geometryin this mae sc that effec$ivesheararea is significantly aaller s than tise -lculated fran formulas discussedin 70.2, 70.3 ard 70.4 above. Formula (7) in table 11.B.1 is an ~irical formulawhich gives an approximate equivalentfor this case. Numerically, describesa failureat the pi&h it diamter of one of the threads. 70.6 `[email protected] stress. Formula (1.1) n table11.B.2 is often used for i acceptance externallythreadedfasteners of with ultimatetensilestrength, yield strength, rare other selectedstresslevelappliedto St in order b or determinethe requiredaxial test load. When threadsare used in a joint,a

tightening torque is applied to overfrict ion, ard to develop overthread in a shear stress, which load, causes an increese friction tier a tdt the axial lcasd. This head or nut, b torgue results

q

when tiined with * tensile stress fran * axial Etxmula (12)in in the effective tensile stress.

=e II.B.2describesthis situation. Experien~ has slxnm that for a solid externally tbrerdedpart, the ccmbinedstressis generally*ut 20% greater than * tensilestresscalculated frcxn forrmd.a (n). Therefore,in this case, the crrnbinedtress is often assuuedto be 1.2S or is not considered s due b SStisf act.myexperience with tbe Facimrof Safe used. &

70.7 Lenqth

of engaqem?nt, LE.

70.7.1 If failureof a fastening systemusing stardardthreadedfasteners shculdomur it is generally nure ecommical tit the externally threzuied part will break ratir than that eitherthe externalor internalthreadwill strip. In other mrds, the lengthof threadengagenmt stxnild sufficient devel.cp & tn the full strengthof the screw. `Ihua, the lengthof internalthresdard the diuensirms this thread,particularly of its mimr diameter,shouldbe such that, takinginto acrmunta pxsible differen~ in strength materialof t& of internalad externalthr.swls, the threaded pxtion of tbe externallythreaded paxt will break before eitbsr the external or internal threads strip. Due to

this situation, lengths of engagement formulas are dez ived fr.an shear fornulas with 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 mile by tbe National 3ureau of Sta.r&rds in 1929, in which it was foundthat for

q

[email protected] arxl cold-rolled steel,and brass screwsand nuts, this factorvaried fran 1.7 to 2.0. The effectof ccmbinedstressis not tiken into acmunt in calculation 12?becausethe added @ear lcxd affectstoth tensileard shear of stressesin approximately the Sanb2 prqrtion.

q'

60

EwsmB28/m

70.,? :2, All Iimmlaa -r @gth of engag-t, given`intable11.Bi2yield apprQX_te Val= Since they are based in part upn shear areaswtiic.h%re not exact due to nut dilatim which varieswith gmtry, frictionforrs, ard materialproperties. Also, the effectivemss of partialthreads,in * countsrsinkfi dmnifer6)ciitlii ~or e*" of the intird thiead,`is iiit always the Smle. For calml.atirxu3, approximatiy ba.lf the crxmtersink [email protected] may te ccmsideredin the -length f ~t. o It is advisablethat ~tirms of lengthof engag~t and correspx-ding hd capabilities a threadedjointbe of cheokedby actual tests,for criticaljoints.

70.7.3 Wls?n the ex~y ad internally thre?skaputs are made frrml matir * of approximately the same strength,requiredlengthof engagauent in formu2a (2.3)f table II.B.2may be applied. This assumesa cmthatirzl o failureof both threads (see70.5). internalthreadmater ial.lv xceedsthatof e of engagementin form& (14)of table II.B.2uay be spplied. !RIis assures shearof the externalthreadd uses the gecmetricshear area of the minimumexternalthread (see70.2) . A slightly I.mgeror abrter lengthof eng~-t will te fiicatad if the simplified formula (5) in Uahl.e 11.B.1 is used.

* external thread, r+ired [email protected]

70.'7.4When *

strengthof *

70.7.5 When the strengthof * externalthred materiallyexceedsthatof the internal thread, reguired hrqth of engag~ in @rmula (16)of table 11.S.2 is used. This is based qxn the internalthrezdstripping load M.ng equal b the ncminalexternalthred [email protected] load which will develcpfull [email protected] of W.externally,threadedgmrk. Zf & ia. Jaas. thsn.1,see 70.7.4ard if approximetily equal to 1, see 70. 7.3. 70.7.6 For an adjustfigor lead screw of if the ~ctim will be frequently unscrewed, * *ulsted IE simuldbe increasedto a.1.kw fir the e~titear On * flanksof * threadsduring tk usefullife of tbe . "~0.?17: For"t&ed)n2es"in ahi?et" *M, ,* kinum size of th6'screw be to ~ifid stxd.d b such" that the thickness sheet equak the LE requiredto of [email protected] full [email protected] In order to use the largestpssible screw,it is n~ssary that tbe tolerance, ~, cn the minor diameterof * b.la slx.ndd be * practicalminimun. If it should"prove .ti& inpracticahle o reduce tk t diametertoleranceb such a vslue, it may be n~ to decreasethe inimr minimumminor dizmter of tl16 internalthre~ arxl increasetb minor to i6 . .Jmximum @BJK dbtar bleranca by the:= arxnant.If this.. daqa,. tlp di,amStar t.hs of screwmust be [email protected] ~" th ~ auxwnt to prevent interfermce aIX3 the.rniux dianeterof the ~ threadring gage must likewisete decreiisd,as this is W cnly controlof the minor dianeterof the screw. In all awh cases, wtw?re dimensions are alteredfrrzn thosecalculated acmrding to tk standard,the threadas.bu.ld e designated specifiedin sectirm6.7 of b as AQ4?. B1.1-2.989.

I I I

I I o

.

..

61

FEESTD-H28/28

~r' retaining us iiishafti"tie * `** aiial firce 70j.& resi-by the collar is appreciably less then the tensilefir02 that ""the shaft iiself is"capable resisting, need orily lcmg etx)qh b withstad of LE be the expec~ axial. forcgw the mllar. If, is. FC QK axial. .for~. @[email protected] . . carriedby the mllar, UIS~ is the tensilestrength the shaft ad W1'Sn of is the tensilestrength the collar,calcolatethe requiredlengthof of engagenrmtfran one of the followingfornmlas: Z?c

a. ColJ.ar thread

strip: I.E =

~

x ASn from (2a), (2b)or (3)

.-- LE

2??=

b.

Shaft threadstrip:

LE =

L71S5 ASS fran (4a), (4b)or (5) x z

c. Cmkinatirm threadstripping when WIS.s W1'Sn = approximstily: 2FC ~. UIS5 or WfSn x X

-FE

frrxn (7)

Note: Numbers in

70.7.9

bth

parenthesis

are

&mmila

v'mmtersfrcxn , table 11.B.l.

or

For I_dlow,thin wall threaded perts as the wall thickness either of internal ad externalumbers-~s thin, the temkncy of tlE external mmker WY enlarge ad the internal Xremker to neck dcnm in * threcd means thatsn I.E greaterthangiven by fornulamustbe used, also that the tilersnces minor [email protected] of the intxmal threadard major diamti of ths on external `thread, ~ ad `M, must be smll to obtain * maximumpracticable depth of threadengagement. For cxqanents having~eeds on thin-selltubing, [email protected]? actualtmrkingconditionsslmld be made ti determineprqer selectirn wall thicknesses, of lengthof engagement, and pitch of thread.

the

qxxtims 80. l'bredm-

in relationto

tapping.

80.1 In the production threadsit is rxms.idered of impractical tap a to threadunless its nmninaldiameteris greaterthan six timss. the lxsic thread height;therefore, wtr?n ti ratio of D to h is less than 6, tk use of a larger diamter, a finerpitch of [email protected], or both, s~~d te mnsidered.

is a factor in cmtrolling tap breakage. Tap breakage 80.2 `l'he size of is infrequent the larm2tir the tap is over 0.5 in. or if the lengthof if 9 of threadto be tappedis less than 0.5D. For sizes less than 0.5 in. and length that of threadover O.5D, tap breakagecsn be minimizedby use of a large ~ is ~ trash. Howsver,thismeans thatLE may have to be increased developthe full strengthof * screw. 62

FEO-8TD-H28/2B ,.

90.--Bxal&s Rf.hreaddesim. . : . . . ...= .,.90a `&m &rel thread. A gun barrel is subjectedb an internalexplosive pressurethat producesa tensilestressin the threadederd. The lengthof ~~t of the ~ ~ be -SUff icient `toprcducea &* -~ea in shearon tk threadsof tk e.crm in line with the mi.mr di~ter of the tap~d FOle thred.sequal to twice * stressarea of the threadedporticnof * barrel. Assume that * thread on the barrel is 1.500-8aN-fi ad the minimum internaldiaus?terf the baxrel at tte threedederxl 0.792 inch. o is I Note: 8ymbol KAaticm accordance with tables 11.B.1

ard fornuib numters in

parenthesis are in

ad

11.B.2.

a. [email protected] lengthof engag~t l?dl.owart. p ~ . 2 (As - o"7fJ54d; )

is titi using formula (14) fix a

with ~

= 0.7854 dw ( \ read as

- 0.9743 2. In this case, As may te \ ni

1.492 fron table13 of ASM3 B1.1-1989. dh = 0.792 n %= [email protected] . 8 = 1.390 fran table 34 of ASME B1.1-l!389. = 1.4093fran tah.le of ASME El.1-1989. 3A

b. Calculating frcsn the atnveyields a requiredlengthof eqagemnt of 0.777 inch. By reducingthe internalthreadmi.mr diameter tolerance half, the resulting nsu is reducedto 1.3775 by inches,zud the reguiredlengtho? engagemnt is reducedto 0.714 inch .

63

[email protected] bracket.b Cask irm part. lb dimeosirm .iarequired .---- for the largeststsae.1 Z= asp tit [email protected] .to bald a ,bracket ,a.uaat on ira-:[email protected] `@e tgrisiletrengthof the steel is 60,000psi, the [email protected] s strerigti "ofthe cast iron 20,000psi, SIXIthe thiclmess the cast iion is of sti that the lengthof threadcmgageanenk canmt exceed1.750 in. Tbe screws -.on* *.eide *f--ti-ba!*"wilJA-iJl-tassios. ---. ------' -------------------,, ... . . . .,., ... ,.. .. .. .. . .. . ~te: .Symbl mtatinn and formulanumbers in parentbesia are in =rdane With tables11.B.1ard 11.B.2.

90.2

q

a.

Since

Calculated.

b.

tkexkrnal threadnxiteridis considerably stmqer than that of the internalthreadmsterial,in -rdanCz with 70.7.5, formula (16)wi.U te used to d.culdte the lengthof engagement required. This Ermmil.as appliedfor LE tased upn shearof the i internalthreti. `R3 rmnfirm this asswuiptim, Ij4 should be

Rl cannot be calculatedfrcm formula (8)until a threadsire is selected. BY definitim, however,R1 is * ratioof ex-nal threadshear area ti internalthreadshear area. M approximation of RI, ran be reade using * simplified formulasfor shar area5 so ApproxhsNz R1 .

F&Ida ZziEm (9). (5) . 0.833

c.

~

is calculated fran fonrnd.a U&

%= ~;=-

=0.333

d.

Fran b end c abve, R1/R = 2.5 approximtdy. This *W being greaterthan 1 m z" mm tbe use of formula (16) for calculation lengthof engagement. of

. . . .

e.

(16)it is seen that * lengthof engageumt must formula k approximately 2.5 timesas lmg es that requiredif shear in the externalthreadwere tke omtrolling factor. Thusr Since * maximunavailable is 1.750 inchs, the approxiOata LE LIZrequired for tbe screw to develrpfull strengthis 1.750/2.5 = 0.700 inch.

Fran

crarse f. J.mmuch as the hole is tappedin cast iron,a relatively threadmuld be reguired,that is W or coarser. The mat readilyavailablescrewsvmuld be UK. Select threadsi7-es fran figure2.B.2which yield LE of a~roximately 0.700 inch. Figure 2.B. was devel~ 2 fron formula (1.5). For 1' - 8uK, LE/D = 0.594and LE = 0.594 For 1~8 7'UK,LE/D = 0.592 (est. and U? = 0.656 ) = 0.600 (est. and E ) 64 = o.750

For lL - 70'N2, @ L 4

I

EZD-S7TD-R28/2B

!0

h. The threadskouldke checkedin zciwrdance with formula (16) . Formula (16)may be exprb as follcws:

I

3.1416~min XL 4 with ~ be

read

= 0.7854 db

as \

(

- 0.9743)2. In this case,As IMy -

`}

0.763 frr.en tahl.e of ASMR B1.1-1989. 8 r+lnin 0.970 fran table 34 of ASME B1.1-1989. =

FOrIIU.&I

`1 = [email protected] .,. . . ..

(6b). +X%* .!n ihnin: Lax. 0.57735 [

(dQin ;I&sax)

. . . n=7

1

dmin = 1.1064 fran ixib.le of ?!SkiE 3A El.1-1989. D2max = 1.0416 fran We so R1 = 0.863

RI .

0.333

3A of M24E B1.1-1989.

fK!IU *W. C

i. Calcuhting frmn 0s atme yieldsa requiredlengthof engagement of 1.729 inches. This is acceptablesince it is less than the masimumavailableengagmt lengthof 1.750.

I

65

FED-Sl!D-H28/2B

(-4

!3

E

tmmwcammmmm

66

m msttn

`am

P'EMm+w29

.. -

. _=-, .~

APPENDIXC AMERIC2N NWX2QLFWU4CF THREAD

. .. . .

100. ~. This appsrdixprovid~ gemxal informiticm `atimtthe obsolete Iimericanati.trial screw thr~s. N form It is not a mardatorypsrt of the stiard. See 5.2.1 for eelecticmof atamiardlhified screw threadclassesto replacethe AnericanNational form threads. 110. Profiles. Basic profile is the same as that of M Unifiedscrew threadexceptthat the width of the fbt at the root is 0.125P. The design profile for internalthreads ia the W as that of tbe Unifiedscrew thread, i.e., widthof flat at the root is 0.250P. 3.20. `llueti classes. `here are 5 cbaees of AmeriainNationalfbrm threads. Ebr informatirm Class 5, see FEM?m+28/23, C1.aSS on 5 Interference-Fit Screw Threads. See below tir other classes. 120.1 AUowaces. my Class 1 externalthrede have an alkwmce. Class 4 externalthreadshave a negativealhance on the pitch diametexonly. Allowancesare ehmm in Table 11.C.1.

120.2 `lbleran02s. Piti diaretertiler-s for externaland internal threadsare .sl'nwn Table 11.C.2. External threadmajor diamter bkrances in for Uaaaes 1 ad 2 equal twim their respective pitch diamebertoleranms; the Class 3 ad 4 tolerancesare the same as the Class 2. Internal mi.mr diam=ter tolersrms for Classes 1, 2, 3 and 4 are @ to 0.1 t~s the design (minimum) minor di-ters.

120.3 Formulae. per inch. Note: Pitch, P = I./threads 120.3.J Internalthread. Min. major dia. = basic major dia.

Min. pitih dia. = min. major dia. - 0.649519P

Max. pitch dia. = min. [email protected] Min. mirxx dia. = min. msjor dia. `"~ fr~ TFMe 11.c.2

dia. - 1.082532P

) [email protected] minor dia. = min. minor dia. + 0.1 (min.minor dia. 120.3.2 Externalthread. Class 1 max. major dia. = basicmjor dia. - esl franTable 11.C.1 masses 2, 3, 4 max. major dia. = basicmajor diameter

67

FBHmx328/ZB major dia. = max. msjor dia. - `I'drcan f Table 11.C.2.

1,

Min. -.. --.=.

I

Classes

2,

3 mix.

pitch dia. = max. major dia. - 0.649519P rmjor dia. - 0.649519P es + frcnn able 11.$.1 T

Class

4 max.

pitch dia. = ~.

frcsn Table 11.C.2 tlin. pitch dia. = max. pitchdia. - `R32 Max. minor dia. = max. majordia. - 1.226869P 130. Desi qnatims. StandardAnericanNstionalfirm threadsare deaignati the saue as the Unifiedthreadsexceptthat series i.rxiicatir not we the dces "Um and class does not have the `Ae or "Bm indkdth fix "external" or mintermal=. Thus, a stam3ardthreaddesignaticm might read `1/2-131?l-2m, br `W" is used for ~ial crmhinatima of exmple. A seriesdesigmstor diaueters, pitchesad lengthsof engagmnt. 140. -es. ~es are designedin ~rdance with tte principles Unified of thr~ gage design. See ~8/6, Gages and Gaging fir UnifiedScrfiw Threads- UN ad UNR ThreadForms.

,..

,.,

,.,

I

68

I?Ews!m+128/2B

.._.=. `""TRBLE 11.C.1- Albwance for AuericanNationilScrew `?lhreiuk: Threads"per inch, tpi

.

Class 4 negative allWanCx2 , es4

inch 80 72 64 56 48 44 40 36 32 28 24 20 18 16 14 13

12 II

10

0.0007 0.0007 0.0007 0.0008 0.0009

0.0009 0.0010 0.oo1.1 0.oo11 0.0012

0.0002 0.0003 0.0003 0.0003 0.0004 0.0004 0.0004 0.0005 0.0005 0.0006 0.0006 0.0007 0.0008 0.0009 0.0010 0.oo1.1 0.0013

0.0013 0.001.5 0.0016

0.0018 0.0021 0.0022

9 8 7 6 5 4 l/2 4

0.0024 0.0026 0.0028 0.0031 0.0034 0.0039 0.0044 0.0052 0.0057 0.0064

10

69

EnHTD-H28/2B

-* .

[email protected]

Ameria

National

Screw

Threads

Y

,,:

q

Pibh diaseter tolerarmes Internaland externalthreads

Threads class

1

E&r

class 1 m

inch

1 threada

Class 2

[email protected]

claaa3 [email protected]

class 4 `rD#rd2

inch

;laases 2,3,4, `m inch

0.0034 0.0036 0.0038 0.0040 0.0044 0.0046 0.0048 0.0050 0.0054 0.0062 0.0066 0.0072 0.0082 0.0090 0.0098 0.0104 0.0112 0.01.18 0.0128 0.0140 0.0152 0.0170 0.0202 0.0232 0.0254 0.0280

per inch, tpi

l"D2/'m2'

inch

inch

0.0017 0.0018 0.0039 0.0020 0.0022 0.0023 0.0024 0.0025 0.0027 0.0031 0.0033 0.0036 0.0041 0.0045 0.0049 0.0052 0.0056 0.0059 0.0064 0.0070 0.0076 0.0085 0.0101 0.0116 0.0127 0.0140

inch

0.0013 0.oo13 0.0014 0.0015 0.0016 0.0016 0.0017 0.0018 0.oo19 0.0022 0.0024 0.0026 0.0030 0.0032 0.0036 0.0037 0.0040 0.0042 0.0045 0.0049 0.0054 0.0059 0.0071 0.0082 0.0089 0.0097

80 72. 64 56 48

0.0024 0.0025 0.0026 0.0028 0.0031 0.0032 0.0034 0.0036 0.0038 0.0043 0.0046 0.0051 0.0057 0.0063 0.0070 0.0074 0.0079 0.0085 0.0092 0.0100 0.o1.1.1 0.0124 0.0145 0.0169 0.0184 0.0204

0.0048 0.0050 0.0052 0.0056 0.0062 0.0064 0.0068 0.0072 0.0076 0.0086 0.0092

0.0102 0.0114 0.0126 0.0140 0.0148 0.0158 0.0170 0.0184 0.0200 0.0222 0.0248 0.0290 0.0338 0.0368 0.0408

44 40 36 32 28 24 20 18 16 14 13 12

11

0.0011

0.0012 0.00).3 0.0015 0.0016 0.001.8 0.001.9 0.0020 0.0021 0.0023 0.0024 0.0027 0.0030 0.0036 0.0041 0.0044 0.0048

10

9

8 7

6

5 41./2

4

1/ _.

Minor dianAer tolerance for internal thread is one-tenth of the minimumminor diameter.

70

I

FED-SIH128/2B

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