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FED-STD-H28/3

31 March 1978 H28 3 (1969) Superseding N8S Handbook Part 1 Section

FEDERAL STANDARD SCREW-THREADSTANDARDSFOR FEDERAL SERVICES SECTION 5 UNIFIED THREADS OF SPECIAL DIAMETERS, PITCHES, AND LENGTHS OF ENGAGENEi4T

This standard Supply Service, the use of all

was

approved by General Services Federal agencies.

the

Commissioner Administration,

Federal for

U.S.

GOVERNME~

PRINTING

omlCE

:

1978

-

161-423/1078

Orders for this publication are to be Services Administration, acting as an intendent of Documents. Single copies available at the GSA Business ServiCe York, Atlanta, Chicago, Kansas City, Francisco, Los Angeles, and Seattle, Services Administration, Specifications mation Distribution Branch, Building Yard, Washington, OC 20407 .l?rice 1.40

placed with General agent for the Superof this standard are Centers in Boston, New MO, Fort Worth, San or from the General and Consumer Infor197, Washington Navy cents each.

FSC

THDS

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FED-STD-H28/3 31 March 1978

INFORMATION This insertion Federal Standard or removal of of Federal or new

SHEET

ON FEDERAL loose pages

STANDAROS leaf and form to sections. permit the

is issued in new or revised Standards pages as

Al 1 Users serting revised cel led pages.

should keep them issued and removing

up to date superseded

by inand can-

New and revised pages wi 11 be issued be numbered consecutive v and wil 1 bear Notices should be retain;d and filed in time as they are superseded by a reissue NOTICE From 1939, the Interdepartmental der the Chairmanship of the National of Comnerce had developed and published Standards for Federal Services. Section 487 of development of General Services Title 40 of the Federal Standards Administration

under Change Notices the date of issuance. front of the Standard of the entire Standard.

h'hich wi 1` Change until `such

Screw-Thread Cormnittee ( ISTC), un8ureau of Standards (N8S) , Department N8S Handbook H28, Screw-Thread

for the

U.S. Code states for procurement (GSA).

that the purposes

authority rests

with

In November 1976, Administration (GSA) agreed to convert it

the ISTC was terminated, and the General Services accepted the responsibi 1 ity for NBS Handbook H28 and maintain it as a Federal Standard.

and

The standards which had been published as N8S Handbook H28, Part 1, Part II and Part III will now be promulgated as a fully coordinated FEO-STD-H28, maintaining the existing sections and identifying them with For example, N8S Handbook H28, Part 1, Section 3 wil 1 be slant lines. detailed standard FED-STO-H28/3 which must be procured individual lY. Military Custodians Preparing DLA-IS 11 Coordinating FPI FRA FSS JFK LRC Activity MSF NBS Pco RDS TCS (Project No. THDS-0006) Activity

ARMY - AR NAVY-AS AIR FORCE Civil ACO AFS BPA FHW FIS Agency

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FED-sTD-H28/3 31 March 1978

CONTENTS

Page 1. 2. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . of . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . ...?. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1

1 1 1 2 3 3 4 5 5 5 6 28

3. 4. 5. 6. i'. 8. 9. 10. 11. 12.

Types of special threads . . Unified thread form... . Preferred diameters and pitches `fhreadclasse s..... . . Allowances . . . . . . . . . Tolerance s...... . . . Length Limit s Method Directions Gages Index ofengagemenc . . . of size..... . of designating screw for determining . . . . . . . . . . . . . . . . . . . . . .

. . . . threads limits . . . . . .

. . . . . . of size . . . . . . . .

. . . . . . . . . special . . . . . .

. . . . . . . . . threads . . . . .

The text of this with minor editorial contain corrections

section is reprinted fry Page corrections. indicated by an asterisk.

the

NBS

HAND800K

H28

Reorganization of the document from NBS HANOBOOK H28 to FEO-STO-H2B creates an editorial inconvenience, when maintaining continuity of cross references amongst the pages, paragraphs, tables and figures of the different sections. For this standard individual sections wil 1 be numbered sequentially starting with (1) one. If the reprinted text refers to another page, such as Page 6.3, this will be understood to mean section 6 page 3. All figures and tables wil 1 maintain the established designations, prefixed with the section; e.g. Table 3.1 and Figure 2.5 to identify their location in this standard. All appendices wil 1 be incorporated in the basic document FED- STO-H28 with other general information and wil 1 continue to be identified with the prefix A.

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FED-STD-H28/3 31 March 1978

1., INTRODUCTION `l'he thread series, tolerances, and nllmvn.ceq specified in section 2 of H28 apply in general to bolts, nuts, and tapped holes of stundard pitches and diameters. Inadditio", there arclargc quantit.iea of tlu-mded parts produced where the relations of dinmeter to pitch are necessarily diflerent from those of thestande.rd threndserics, and thelengths of engagement either 8horter or longer than for bolt and nut prncticc. Such threads arc designated "threads of specird diamcl.ers, pitches, ancl lengths of engagement". Selected combinations of (Tnificd special screw thrwtds arc Iistcd in tablr. 3.I. Pkch diameter tcdemnccs in this tdda me hnswf o" n length of thread cngngcment of O times the pitch, Thepitch diamcterl imitsarea pplicablefoa Icn th of engagement of from 5 to 15 timm the pitch. (T%" M should not be confused with the length .f I.hrmd on mating pnrts, w it may exceed tbe length of engagement by a considerable nmoun t.) 2. TYPES OF SPECIAL THREADS

3.

UNIFIED

FORM

OF

THREAD

The Unified form of thread profile M specified in section 2 shrill be USA

4.

PREFERRED DIAMETERS AND PITCHES

The USC,whenever [email protected], of the standard series of screw tbreada listed in table 2.7 k recommended for all npplicntions. Whenever aizea and pitches in tcble 2.7 are not suitable, the designer abouldf if pmssiblc, chome n thrcad from table 3.1 which lists dectcd combkmtions of Unified special screw thrcads. If a selection cannot be made from either t nble 2.7 or 3.1, consideration should be given to the following parngrnphs in a choice of thread. 4,1. PREFERRED flArnErmw.-Wbenever pcssible, tbe be.sic ,dkmcter should be selected from series of ditameter increments as follows:

There are varkua degrees of speckdizat ion in the design of special thrmds that may be cbwzified as follows : (1) A standard thread that. k modified by the inclusion of some nonstandard fent.ure as discu.wed in section 2, (2) A thread of n standard dinmeter euch an is found in one or more of tbe thread series in section 2 associated with a standard pitch listccl in table 2.1 forming a diameter-pitch comhkmt ion tbat. is not in a standard thread series; for example, 1.C4M-10 UNS, (3) A diameter of odd size such M 1.137 in. ucciated with a stnndnrd pitch, (4) A thread of either standard or nonstandard diameter associated with n mnstnndnrd pit oh; for example, 1.XIO-15 UNS or .S95-26 UNS, (5) A thread of nny of the first four degrees of apecinlization to whtch npecid tolcrrmm-s nrc npplied, (6) A completely special thrcnd that devint es from tbe sttmdn~d Unbied thread form.

RmnE.

Dt.meter i.creme.b Yimtdioice

I

3ec.andctmie3

in 0,25 toO.6 .bave 0.0 10 1.5 mb.wel. stoe. o A)". 6 to 10 A-we 16 ta 24

i" 0.05 0.1 0.25 0.6 1,0

. .. . .. .. .. .. .. . 0.05 0.1 0.25 0.5

In the wend OJ ecmnnv, tho & adhere to Wmdard thrzndz ar to had 7-W enturm conJonniw m cfosdu us PO%SW & established stmdmk. Itshould be rememhcmd tbat epecial threads cntnil

tbe design and manufacture of special thrcadi"g tools and gages wkb cmucquent greater cm.ts, i"crc~ in inventories, nnd difficulties i" prcmuri"g c.pare p?rta when rcplncemcnts me necesmry. In tbm scctmn! st andurda for special thrruds arc presented, including thread form. sclectcd cornbh. tiom of Unified special screw threads (table 3.1), allowances and tolerances, and detailed direct ions for specifying special threads on rfrnwing~, A discussion of factors nffccting the denign of qxwitd threads is presented in appendix A5.

It b recommended that diometem less thtm 0.25 in conform to the standnrd .zizea of e.cmw8 under 0.25 in. as there is virtually no nece.mity for the .wkctlon of a dimnctcr "ot included in three sizes Furthermore, the coarse and fine thread series pw vide ample choice M to diameter-pitch combim+ ticnm 4.2. PREFERRED Prrcnm..-Whenever pomible, the pi(cb should be eelected from the series 40, 36, 32, `X, 24, 20, 16, 12, 10, S, 6, and 4 threads per inch. Intermediate pitches should be used only when absolutely necceaary. Pitches coarser than 4 threads pcr inch me mt komnwmded. There arc practical fimits to both the largest and zrmalfest diarnetem suitable for any pitch. The curves on the chart for determining minimum Iengtb of thread engagement i" Appendix A5 stop at such limits, 4.3. B.KWCTHREAD DATA.--Ba6ic thread data for standnmf pitches are given in table 2.1. These data arc to he umd in conjmction with the dkoctiona for specifying npecial threads cm drawi"~ as given 1" par, 5.4, p. 3.02,

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FED-STD-H28/3 31 March 5. 1978 THREAD

CLASSES coded, am basic, tiording no allowanm or clearance in mmembly at maximum materkl limito. Affowanc= for all diametem and pitch dmeter tolerances are specified in tables 3.2, 3.4, and 3.7. Their application b shown in y 2s. 5.3. CL.ASSEE AND3B.--C aeaea 3A for external 3A threads and 3B for internal thrends pmvidea for, appficatiom where clmenes of fit md WCWUCY of lead and angle of thread em mportant. l%ey am obtainable cm.wstently onfy by the use of h~b qm+fity production equipment, suppm-ted by a veiy efficient system of gaging and inspection, The msnmum dnetem of class 3A (external) tbresdn and the minimum diameters of clam 3B (internal) threads, whether or not plated or coated, are btic, affording no tdlawance or clearance for a?aernbly of maximum mnterifd components No alfow.snce is provided, but since the tolerances on GO gages are within the Iiiita of nice of the pr~ duct, the gages will assure a c.hght clearance between product made to the maximum-material limku. Pitch dkneter tolerancm are npecified in tablea 3.5 and 3.S. Their supplication in shown in &@& 2.6. 5.4. SELECITON or CLAM or Tnnmm-Connidemticm should first be given to tbe we of a ck 2A external thread with a cl2B internal thre++d since thew Amen are designed for general use. The use of clasa 2A provides that them will always be a small clearance between msxmum-mderi8f except when the external thread is plated, P tated Prtn are intended to be gaged with ba+c~ize GO g-. In e]thy ctqe, it in expected tkt ~ w~l nenemble readily without galling or eeiing. Tole* antes are .3uIWxently large so that ordinary pr.xf"c. tim methods are generally applicable. Past experience with simifar deaigm may indimte that a more accurately made or closer fitting thread in requiied than that which in pm'mitted by class2A and 2B tolerances. In such cawn conaidemtion should be given to the use of cla.sw 3A and 3B. The necesmy increase in cost should not be over. looked. In some designs them may be advantages in prw vialing for greater average loa9eneea of lit than that obtained with cl= 2A snd 2B. Such greater average Iocaenm b provided by C* 1A and lB or the mssemhly of cl1A extemaf threacfa with cfam 2B internal threads. `f%e minimum loosenem, however, k the eai-ne an for clamw 2A and 2B except that a pmitive allowance in provided for plated parts, When.9 greater minimum Icmseneeais req"isik to mvide for adverse conditions of a!sembly, clam 1Ai" IS avadable, which is not a Unified cb?ay and in IxMed on the American National clam 1 aflmmnce combined with CIME 1A tolemnce. Tlwae cfaac.cs also provide larger tolerance to the manufact"mr, which may be of ndvant,sge if the thread in dMicult to [email protected] It should be noti. that any clsm of external thread may be as!.misted with any cka of internal thread, there being m requirement to combim classas of like number.

Thread cken are dutiiidwd fmm each other by the amounti of tolerance and tdfowrmce. The f~qtion of these cfaa+ea is to aesura the interch8nge$I#y t&$$~% & n eatahfiihed for geneml `w diiinct .l~ .f use. [email protected] cla%en are: 1A, 2A, and 3A (for external threads only) and lB, 2B, and 3B (for inteme,l threada only). Clam IAR (for external threads only, 16 threads per inch and cosrmr) in aleo included for special use. Clam IAR is produced by combming tbe American National c186Y1 allowances with cl1A tolerances. The dkmmition of the tolerances, allowamwt and crest clearances for the six general w cl-s is illustrated in figures 2.5 and 2.6. The requirements for a screw thread fit for a BWifiC aPPl\cati?n ~n be met by specifying the proper combination of cfa.wss for the compommts. For example, an external thread made to clam 2A fiits can be used with an internal thread made to oh lB, 2B, or 3B finite for specific applications. 5.1, CT.MSES 1A, lAR, and lB.--The comhina. t.ions of cfassen 1A or lAR and lB me intend~ to coyer the manufacture of threaded parts where qutck and ~ -mhly in ne-, and where an alfowance u required to penmt ready. ~mbly, even when the threads are dightly bmieed or dirty. Maximum diametem of clam 1A (external) threada are lea than b="c by the amount of the .qp,Me~. Iowance as applied ta clam 2A. For the intended [email protected] Am-i= iII practice the sllowance in or coating. Where the not .svadable for plating

thread n~.

in pfated or coated, epecial pmviaionn are The minimum diametem of clnea lB

(inter'r+J) thmdq whether or not plmed or OJSM, c.m km, affording no rdlownnce or cleamnce for amembly with maximum msterial external thremi cmnponenta having maximum d-etem which are basic. Albwances for all diametem and pitch diameter tolemncea are specified in tables 3.2, 3.3, and 3,6. Their a plication is &own in figure 2.5, .5.2. 1%.ASSES2A and 2B.-Cfnmea 2A forexternd $?d.Y and 2B for internal tbreada me dmi$ned nemf use. A moderate allowance b prcmded for~~ 2A threads. mnximum d-etan of class 2A (external) uncoated tbreada are less than tic by the amount of the ~lowwee., The allowance minimizes galling ti?~i;.?%%%ti~i;;d %%%% ~;h;~ coating. Howeve~, for tbrec.dn with addk,ive finish, the maximum dmmetem of cbn 2A may be ex. cee+d by the amount of the allowance; i.e., the 2A mnxumun dunetem appl to an unplated part or to a part before plating, wi ere= the btic duetem (the 2A maximum diameter plus allowance) apply to s part after plating. The minimum diametem of cfma 2B (internal) thmada, whether or mt plated or

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FED-STD-H28/3 31 March 1978

6. ALLOWANCES where a factor which differs for each clasn bmio major dkneter L. = Iengtb of engagement p = pitch. Thii formula is bsmd on the accuracy of prwnt day threading practice, ar.d k applicable to all reasonable comblnnticmn of diameter, pitch, and length of engagement. Numerical values of the increments in the formula for standard diameters, pitches, and lengths of engagement are given in table 2.19. The values of factor C for pitch diameter tolernncen me .93 follown: C D -

l% allowance k minus nnd b appfied fmm the btic size to below baaic size. Aflowanca in applied on3y to tbe cla.swa 1A, lAR, and 2A external threads. Values of tbe allowance for clnssea 1A and 2A me obtained by w of a C factor of 0.3 in the formufa shown in paragraph 7.3. Numerical values of cl-s 1A and 2A allowances for the commonly used pitches are listed in table 3.2. The fonnuh in pmagmph 7.3 is not applicable to cllAR m this clnsa in produced by combining the American National CIW 1 allowances wltb cl= 1A tolernnoes. Tbeae allowances are larger than those for cl= 1A and 2A and provide for ready ses.embly under adverse comfitha. Numerical values of clnsa IAR allowances are: Tt,rcds per inch (lpi),

"

Clans IAR allowance

Ckl

l~~d

Factor c

1: 12 1: 6 4 (Chum lAR allowance apply tbreds, 16 tpi and CO=.)

0;% .MJ24 :%% .0044 .00a4 onfy ta external H 2B 3A 3B

1.KIO 1.WJ 1.0J3 1.3m 0.734 .976

7.

TOLERANCES

The folfoying general npr?ci6c8ti0n3 apply to all ;~<ed forspplicatmnsof the .nitied form 7.1. UNWORM MINIMUM INTIORNAL TMEEAD.-- ktm mioimum major, pitch, and minor diatnetem of tbe internal thread are, respectively *IU! same for okaes lB, 2B, and 3B. 7.2. DI?IECITON AND 8COPE or 10 LMIANCSS.-- (a) The tolerume on the inLernal thread in plus, and in appfied fmm the tic size to above bade

mm. --

(b) The tolerance on the external thread in minuo and is applied frum tbe maximum (or design) .sir.e to below the M8ximum sise. (c) The tofemtwes npecified represent the extreme ~3tioP-m~rmJted on the product. -- Toumamm8.-'Yhe basic for&& for pitch diameter tolerance in carnpoaed of the following inorementn:

P.D. Toleranm c(o.oo15v~ + o.oo15q + o.o15wp),

R will be noted that the factor C is 20 percent greater for internal than for externnl threads of a "ven ckwm number on account of tbe relative %icuftiea of mmufactum. Numerical vshma of pitch dimneter tolemncen for cla%wa 1A, lAR, lB, 2A, 2B, 3A, and 3B am given in tablea 3.3 through 3.8. Two eeti of tolerances are given: The for 5 to 15 pitcb~ length of e-merit, w O? [email protected] of 9 pitches, and th= for 16 to 30 pltohm length of engagement, which are 1.25 timrm the 9-pitch wduw. For lengths of engagement over 30 pitches, it i3 recommended that pitch diameter tolermcea 1,5 times tbe 9-pitab values be umd. If exmssively mmfl or large Iengtlm of e~ment am encountered, the thread tOler. mmay lx calculated fmm the formub+, if ccmsidered advimble. Afso, for threads per mcb not idcluded in the tables, tolerances ehould he calculated by applying the fcmmhw. 7.4. M.uoR Dr.ummm TOLERANCES. -(..%) Ez&rnd fArmd8.-Tbe tolerance on msjor di.wneter for special threads b not specified, M it must be deWrnined in r+ticm to the requirements of B @ven design ~n accordance with tbe prwedum cmtlimd in ap~n~ A5. Preferred tolerances equal to o.ofio [email protected] for cla.!sa 2A and 3A, and equnf to 0.090 @ for clnenea 1A and lAR are u fcdlows:

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FED-STD-H28/3 31 March 1978

Msi.ar di-tm ThMda w. tnhrlmca Cbzea 2A snd 3A, 0.060+ZZ a gage or w "ng method that reprm?ntd the maxi. mum-moteriz!'ccmfition of the internal thread 1the aflowancea, if any. (b) htemal thrmdz.-Formufm for the intemaf thrmd minor dmeter tolemocea are zbown in table 2.2o. Numerical values for the tolerances am zbown in tables 3.9 and 3.10. To reduce the [email protected] of mimm dueter toleranczz to a pmctwd mmumun, toleroncez are shown in these tables for selected pitches tmd dwmetem In these tables, the tolerances an? u follows:

Inch

Clc.=a 1A d lAR, O.omwp in . .. .. .. . .. .. . .. . .. . . .. . .. . .. .. . .. .. . .. . .. .. .. .............. ,------- . . . . . . .

o.&32 .0335 .m33 .0341 .0045 .m4s .m31 .m5 .Omo .Ca6s .mX17 .0072

.0321

40 36 32 20 27

o:~7 .WsB .mm .O1m

.010s

[email protected] of m~wnent f.emthan 0.33D . . . . . . 0.33D to 0.67D. Ovrr O.67D10 1.6 D.. Over 1,5D . . . . . . . . . . .

fomub V.lue ao 75 ;% i

mti.

.0122 .0131 .0142 .01s5 .0172

10

Fmm

0.6

y::s 1.25

.m37 .We4 .0103 .0114

.0129

8 6 4

.0194 .02!5 :%

.Oml .0132 .023.9

When the to!emnoe value so mmputed k mom than 0.394P, which conwpondz t-a a rmufting ,tininnun thread beigbt of 53 pzrcent, the value m .zdjuzted to equal 0.394P.

8. tolerance on mn"or (b) IrUemnl Uwa&.-lh diameter is far refere.om only. It is equal to I1 /6 plus the pitch diameter tolerznce of the cbwa of tbm+d mvolvc?d. The maximum major diameter of the mternzf thread mz,y be determmed by adding table 2.1) to the mmxinmm o.7933b7p (= llH/12, pitch dmeter of tbe internal thread. However, thiz diameter @ball not result in a root Szt width Iesz intend threzdz the than p/24. In dimenaioni~ nmxinmn major d-eter m not npeoif ied, Wing

eatabfisbed by the crest of an unworn t~l. In PmCti~, the major diameter of an intemnl thread, b szttiactcmy when amzpted by a ~go or gz.gm "f method that represents the maxmmm materm condition of an external thread which hnn no alIowrmm. 7.5. Mmon DMMmxn TouanANcEz.-(a) Ezfanol tfumdm-l%e tolerznce on minor dmeter of external ,thrmds is for ~ference only. At the norninaf minor dfzmeter, that m, at the interazctian of tbe 2.3) it rounded rmt with itscenter fine (nee 6 [email protected] the pitch dmmeter tolerance pl~ h /12 and 8PPh2a only where the rounded root m a req"ir~ ment of the deqn. Other'mqa tbe tolerance shall be H/4 ply the, pitch diameter tolerance. The minimum mmor dmmeter of the externzl thread may be determined by s.btmoting 0. S49519P (0.75H, table 2.1) fmm the minimum pitch dizmekr of the externaf thread. However, thu diameter hall not result in a rcmt flat width leM than p/8. In dimendoning extend [email protected] the minimum minor dLwneter is not speoifizd, bang estnblizhed by the crest of an unworn tool. In practice, the minor dinmeter of an extemzf tbm.nd is satisfactory when accepted by

LENGTH

OF

ENGAGEMENT

The valuez in tablea 3.9 and 3.10 for lengths of engagement frmn 0.67D to 1.5D, are mitable for general appfi28ti0n3. Some thread applioationz have lengths of engagement which are greater than 1.6 diametem or Ima then 0.67D. For sunlicationa hovinn shorter or longer [email protected] of enticement it mzy Fe 2dv2ntageoua to decrease or ince the internal thread minor dkmeter tolerznoe ~ explained Mow. The pri.cimf practicaf factors that govern thtolerances a,., tapping dficoltiei, particularly mP breakage in the small sizes, availability of standard drill sizes in the medium and farge sises, and depth of engagement. Depth of engagement wrrel8twith the .strippin~ atrength of the thrmd mmmbl , rt nnd thus rd.m mth the length of On-ent. also oorrelatm with the tendency toward dmen~ meat of the threndz on one side when =mbfy in eocentric. The amount of +ble eccentricity in one half of the sum of the pitch d=eter allow~ze and tolerance on both matins thmadn. For a gwen pitch or height of thread thts sum increase? with the dimneter, and nmordirr$ly thin factor wmdd require ?. deoramz in minor dmmeter tolerance with increase in dinmeter. However, such `decrea8e in tolemnoe often iz not fezzibfz without 72q~W special drill sir.ea; therefore, to be able to w M many aY pmsible of the available standard driff si= listed in USA B5.12, tbe minor d~eter tolerance for clncsea lB and 2B of s given pitch fm 0.25 in. diameter and lnrger is constant, in m%mrdance with tbe formula: 0.25P ­ 0.4P.

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FEo-sTD-H28/3 31 March 1978

`l'here may be applications where the length of e,~ement 01 the mating threads or the combina. tmn of mnterw.fs used far mating threads me such that the maximum tolerance mav not Drovide the desired strength of the fmtenin~. Ex&rience hM shown that for. Iengthn of engagement less than 0.67D (the muumum thickn= of standard nuts) the minor diameter tolerance may be reduced without causing tapping dbficultms. In other application, the length of engagement of mating thrends may be long because o,f design cmmiderations or the combination of mnter,nls used formatingthreadm Asthet.hreads engaged mcrmse in number, their depth of engagement may be shallower and.sldl develop atrippingstren Chgrenter t.hantheexternaf thread brea!smgstrcngt f In these cthe maximum tolerance should be increased to reduce the Poembllity of toppmgd16icultie.% Recommended internal thread minor dmmeter tolemncca for various lengths of engagement are shown in tables 3.9 and 3.10. Recommended hole size Iimita before threndi"g for different lengths of engagement are shown in appendix A3. f~tenem and some custom threaded [email protected]! it is customary to be acceptance at tbe nunmmntmaterinl condition (minimum pitch d!ameter of the ext.er.naf thread and maximum pitch diameter. of the. [email protected] thread) on threaded plug and nng -g, ~th ~es to the thrd form nnd length specu%d m sectmn 6. See Dlmen.wonal acceptability of threads in that sectton.

10. METHOD

SPECIAL

OF DESIGNATING SCREW THREADS

~

For the method of designating threads of special dimnetem, pitches, and lengths of engagement, and UNS threads (threads with Unified tolerance formulations), see 8130 section ,2. Tbe symbol "UNS" in apphcsblc tO any thread, (1) having the basic Unified thread form, (2) with links based on Unified formulations, nnd (3) which in not Iiited in table 2.7. Selected combinations of UNS threada urc listed in table 3.1.

9.

LIMITS

OF

SIZE

W1tb respect to the pitch dinmeter fiiita of size, it in intended, except M hereinafter qwdif ed, that i no portion of the complete thread be perrmtted to project beyond the envelope defined by the maximum-material limts on the one hand, o! beyond that defined by the minimum-material lilts on the other, and thus be outnide of the tolernnce zone m illustrated in figures 2.5 and 2.6. The full tolerance cannot thc~e fore, be used on pitch diameter unless deviation m other thread elements are. zero. Dweter equivalents of variations in lead, uniformity of helix, and flank angle are in the direction toward maximum material. A!so included in pitchdiameter liudts are other varmtiom from size and pro f.fe, such m taper, out-o f-round,. and surface defects. Thus the maximum-mnterud pkch dmrrwter fiiitn.we a Ikmtation of the vutual diameter (effective awe) and are so specfmd herein for nll thread clas?ea. It h intended that diameter equivalents of deviation in any given element except pitch. diameter should not exceed one-half of the pitchdmmeter tolerance. Values nre given in table 2.22 for deviations in 1.4 and haff-angle equivalent to one-half of pitch d-eter tolerances. Flank angle equivalents aJoo~6dWb.bawd on a depth of thread cngngement Variations in &nper and roundnem of the pitch dmeter, together with wriationn of the pitch dweter as a whole, may be in the direction of minimum material and thus tbe minimum-msterinl pitch dhnetq fiiit may be, specified as a limhaticm of the pitch dl~eter = a angle element. However, in view of the mterrelatmn of the pitch d,nmetcr, variations in lead and flank angle, etc., together with practical considerations relating to est.abfinbed production proct=se+ product appli-tion and inspection procedures, except for cl= 3A, for

11. DIRECTIONS FOR DETERMINING LIMITS OF SIZE OF SPECIAL THREADS

The following dnctions are intended to simplify the ttwk of the designer or specification writer in preparing the specification for n npecial thread: The procedure to be followed in detmmining yaluea for the escntinl tbrend elements (IM shown, m fig. 3.12) and the umociated tolerances, in outhned m table 3.11. The application of tbia and other tables in illustrated by the followin~ example: Internaf thread, 2.5W2SUNS-2B Length of engagement, 1 in. Min major diameter = 2SIXIJ in. Min pitch diimeter = basic major diameter 0.75H (table 2.1) 0.0232 = = zz~m­ ­

Mu

pitch diameter

= min pitch tolerance

diameter + (table 3.7)

q

= 2.6768 + 0,0i173 2.4841 Min minor diameter = b~ic major dweter ­ 1.25H (table 2.1) = 2.5oo -0.0387 = 2.461 Max minor &meter = min minor diameter + tolerance (table 3.9) = 2,4613 + 0.0363 = 2.46S The dimensions of the above internal thread may be stated on the drawing as follows: Major diameter: 2.5W30 min Fitch diameter: 2.6768 . 0.0073 - 0.00C0 Minor d-eter: 2.461 + 0.0063

q

- O.ocm. 5

Downloaded from http://www.everyspec.com on 2012-07-01T19:45:31.

FED-sTD-H28/3 31 March 1978

External thread, 2.5WI-28UNS2A with the above thread) (To mate h stated on the drawing M follown: Major diameter: 2.49S6 + [email protected] ­ o.ma.5 Pitch diameter: 2.4754 + 0.0000 ­ 0.0049 Minor dimncter: 2.4548, nominal, The design of a sprcial thread usually requires that considcrnt ion be givrm to varimm {*CIon in order that (he thread wembly will function properly. These factom arc discussed in appendix A5. It is to & noted particularly that deviations from tbc preferred toleraucm for 1.najor dinmcfcr of the extcrnnl thrcnd and for mlrmr rliumeter of (he int ernnl thrcod mny bc nc.cswmy i,, wd.r (o arrive at. the optunum dmign. 12.

basic major diameter ­ allowance (table 3.2) 2.5000 ­ 0.0014 = 2.4986 mnx major diameter -- Min major dinuwter tolerance (tabulnted on p, 3.04) 2.4986 ­ 0,MM5 = 2.4921 Max pitch dinmetcr max m.jor dimncter 0.75H (table 2.1) 2.4986 ­ 0.0232 = 2,4754 max Ditch diameter -- tolMill nilch dhmcter era;ce (table 3.4) = 2.4754 -- [email protected] = 2.4705 Nom minor diameter = max mnjor dimnctcr ­ 17H/12 (1.4167H) (tublc 9 -..1\, = 2.4986 -- 0.042S = 2.454S.

iknx h.sjor dkrmeter

GAGES

marking,

gngrs

The dimcmicms cd the nbovc cxkmd

thread mny

The ~pccifictit iom for gngcs. including = pr=nl~ i,, SCCl oll 6 ripply *ISO I 0 t

for

@cIfil

thr~~~.

6

Downloaded from http://www.everyspec.com on 2012-07-01T19:45:31.

FED-STD-H28/3 31 March 1978 Tmu 3.1. Sekhd mmbidimu, C.ifd --

m.

spa-id u+.. kind.,

1'NS

--

,

ml-n ,,s28 ,C+40 tm(8 1S3.60 .*,1-M .Ue-lo ,s,641 .1,8-M %24 m-n ,m-m .s40 .m,n .X&x ,a!%n .2!7.Wi .3,al-40 .,W-48 .,7s-,, ,Jlt-n ,?&s ,ns-,o ,m-n .,37s-t R .417$ -14 ,Z,s-n .4173-U am-,. ,JQ1-1, ,W-,, ,X+!n ,~-24 ,Kn-n Xc-1o U+*O .-,4 .-n .M2s-m .66Z.$-40 .s,,

s -- 2A IA ,. zA 1A 2A 1A 2A ZA 2A 2A 1A 2A 2A 2A IA 2A 2A Y. u 1A 2A 1A 2A z. u u 2A *A :; 2A ,A 1A u ,. :A 1A 2A 2A ,. ,.

-- -L

_"!

M*n.,, 34 ----

F,uh d.mda

mm, -

.

Mia .-- 6 -- iii .1638 Ww .IU7 .1!32

!".

-- . a . -- 71

u.

----

--

mm 10 -- ZB 28 tam .IC.M .t67& .,,,0 .ttl, ,,?s6 ml, .Ima in w ill ill n ZB 28 m ,8 m iii .Iln .m 2B In m Zil .Zm .188! ,aonl .Zm .3309 MM .s43.! .MK .W .3910 .Wa, :B :B m %B ,8 m 20 IB m m 20 m :! .343 .s(s X4 .tn .m ,m .407 .4!0 mg m 20 Ml <us m *B 18 ,1s4 m *U 2!4 .$231 .L?m xl m .,71 .4!.3 .5* U, .hls .423 .440 <s .,m m .m .2,0 .m .,m w .,87 1, -- f., 8

--

Ma. -- ,s -- w"

--

m., --

,4 --

.

&-. -- M .

--

Mk -- ,8 -- $,m ,#m .,,m ,,om ,ma .,,CU .*,W .,,m .ma .Zxo ...mn .Z5m ,I%a .s!?3 .,125 .,ln .,1= *M .mn .m 17m ,Icm ,On .*I7E m, Am

dam. -- -- 0?? .msa .Ons .m, .m .Cma .ma .&m .C.na ,Wa7 .COu ma,

oh

,Om m m ml mm w [email protected] 0)07 0011 ,mlo [email protected] mm

I

O,kn

.,U, .ttn, .$9?, .1s93 .*18I .2[81 .2,J2 .Zlw [email protected] mm .;491 .Uol .S4W .Zlm ,,!,, ,Zlla ,31:6 .s1!1 .3737 ,Sm ,s7'( .s741 ,a$m .43U .4s81 .4384 .4,M `ml :~ ,,s! .. 40% 4*8I 4W `m ,Sa ,Sd, c .s6,, .s1: .56,, .s2S

b

,7,1 ,,,Z9 17J7 1777 ,s7)

o.

k

,;:U

,,00 ,!69 ,,72 ,13 ,m ,!03 ,,9s m X5 210 ,= 50 ,m ,9* ,S81 m m ma m ,>4{ ,W S4 ,Ss0 ,m {m ,'00 ,414 ,,,0 ,m *m ,4s8 43J ,46! ,480 ,478 ,,78 ,!0, .SL ,m .54, .Sd4

~m

,;,, .Ino .Ini .17t! ,71* ,Imn ,Iwa .W15 wu .rl'a .Y250 .nm .Inl *W 2W .Ycal mu ..raca .Us9 ,= ls70 mu SMo .W14 .4104 .4134 .4103 .,1!3 ,4W .44s0 ,s3s `m <m w= {m 4B38 .s,6, .6384 .s"3 .S4CJ .67U ,,7s8 ,77s ,,7W ,,8,0 ,3419 ,m.u [email protected]

oh

,mn .MaI mm .Mn .Wa$ m37 .0Q14 .mn .mu ,JOu mm .mal ma call .mu .m,o mu .COM .MM .m47 .OLu .m* .m" .Ms4 ,M1O ,m47 mu .00,0 J& .COM .QW .aal .0048 ,Je4a .M4, .Ccdl .0048 .Cau .Ca, .Ca4

,Ital .(700 ,1718 17$% .1s41 ,1s60 .,W, .mlz .2181 .2Z11 .Um .Zxa .nm 13s0 .m [email protected] ..an .W .Ysn .Mm .Ilw .LW ,1811 .J9.M *W5 ,4087 ,(I$I *171 ;:a~ .41?1 4ml ,4878 .4711 .4777 17C4 .Ww .Ju8 .s!02 .s121 S7Y0

.,?,

.,08 .,00 ,W ,,97

.1,C4 .2,07

,Iom ,m17 WI nll

,,,,,

.14s

mn

,m ,Yn, lam 23X ,X0, ,1,,7 ,m m ,m, ,aa ,S'u .= ,38,, us ?700 ,4070 ,(1U .,,1, .4237 .,13 ;:g ,4W, 4W7 47m ,4m7 `m ,m mm Mu Msa .Scui

Yln ,23!1

.;440 .s4,7 ,:,8, Joy

ZM! ,11$7 nn ,2974 ma as ,J9Q

.mm

.XOn mm ,XQ1.! .W1

[email protected] ,Xa ,W!o OcOv ,JOm ,@w ,$011 .Mtl .Wlo ,Vm ,mll .mu ,mll ,ml I ,m,, ,aw# ,m#6 ,m ,JQM .Caa ,W1* ,Wl I .m,o .m!o ,Mls .00, I .00,0 .Cao 00!5

.ma

.mn .03', .m3s .MM .Ow, ,mow .C.Yu .ODla ,003s ,JQ.n .COm :p: .m m,, .003s ,mll .Oola .00.n .MM .0)37 .M2 Carl .C031

.3M0

Mm ,s498 ,J.W arm %648

I

m,

,ml ,4WI

.42$7

,4tn ,A, t!

.,,,,

`%70 .4M6 .<m <MO .40,8 ml `m 4s3s S!+7 .$$47 .S.K4 .!368 .8,,2

4s1 A44J ,,,21 ,8X ,4717 474s ,8!0 ,Sn ,s148 ,s73 .,,.s,s .s21

41YI

:% .W

.m ,mm .$X9 .Ua .Mn .W1 .Jml .Mm .ClsO

.,,8

7

Downloaded from http://www.everyspec.com on 2012-07-01T19:45:31.

FED-STD-H28/3 31 March 1978 TABU 3.1. &hdd cmbindimi Uni&d w&4 -. Weds, UNtGConIiaucd

ut&-

_ 8 --

9-M ..,m-1# .IIO-M

:mll

.0010 ,aolo .0211 .*14 ,ml# .C411 ,moLo .0010 .*18 .Wl, .0011 ,YOll ,mle .Wo .0011 .WI1 ;@ .0014 .001 # .mla .Call .Calo .Cdm .Wla .mu ,0010 .W,a .CO1l .anu .mll .ml# .001* an .0011 .001s .CW ,4018 .Wn am?

m-u .?W-n .,p.u .?IO-a

.G19

.M-ls .m-si

.m-rl .mau m-a j .-10 l,em+~

1.-10 l.mu l.omv

I .U+n I .M 1.8,-10 1.19-16

T1 Mub Mb Wta9 Mm -- -- ---- ---- -- -- Mb -- ,, --

4161

.&

.k

.Ola

,4,s

.OM

.um

.7Lm

,m

7

.&l, .&m

.m ..mn mu ,702, .R7u ..7,s .n,l .717C ..7W .n,o .nn ,71M .M ,7W ,Mn .m .nn .MM .lu8 ,IuI .Im .Uoo ,m .Uu .ai, .Ma .aln .nal .= m!, NM .s747 ,Ow .Cw7 .m .= 1.1.017c 1 .mu l.,m, 1.W I.ma I .=, 1.U70 1.s440 l,IU1 ,,4s,s 1,47,, I.nm I .17m 1,I.ml I,7D,* .Mm 1,am 1.0717 1 .Sm, ,.,7N 1.NM 1.:178 ,.s0,, ,.IZM ,,,tn 1.UM ,,4404 ,.44Y'I I .Ulv 1,s7,4 #.Im l.cl'n 1.9U

Plki.rmmu

&

-

--

--

Mu --

13 -- .%

--

Mb -- M" 11 -- 14 18 18

19

,0

:&u

.Mn .mx ,all

"k

,-

.X4

.&

.Im

.&

.m .-

.&s

&

`km

.am fm

,CaO

!s

,W2

.U,,

.Mu

.bam

.8$31

ZB rn m

08s

,bw

,988

.018, .7!W

.CW

.m

.7M ,7,* ,m

.Owl

.7&m

.m

.mu .ma

.-,

.Om ,ru

ms

.7M9 .=

.CQa ,Ocu ma]

.7-

.V,m .74E .Km

.74,6 .7,X

,m

la

,?16

.mu

,mn ,an

.Iw4

m

.710 .m

,710 no

.m

.nlo

.lm

,Mal

.?14s .719

m m

.71X .nal

noa

.W

.ImO Ma

.74M

.74M

.0024 .mlo .mu

.ln

.72!

71U al n

.Ml(

.UIJ

.m;

.?WI

.mn .,nl

m

.76? .111 .m

.7SI .m

.81M .-

.mn

.m

.mo

,Uu

.m

m

.Ii49 .W1

[email protected]

.Um

.97U mu

JIM

.C041 .ma

m m

.140 ,Ma

.Um .-

.Cau .-1

.17m .mm ,m

.s11 .Im

.W

.Wo

.17m .mto .=

.Waa

,ma

#B m

.W

.Iu

um

,nll

,W

.W

.C6n

mu

.14as ,17u

la

.s!4

.Uu

.MIa

.Mu

.Um

.lm

m

.m

.*12 :faJ

.am ;= ,-

.1*W

.Om

1.tca ;:=

.1107 ::;WJ .Ix4

g

:=

;=

.0& .W ,=

In

.Um

.MI1 .W

.Nlo .ml

1.OW ,.oca

.-

.Sa

XB LB

.MO .-

.tui ,m

.Ial

,8011

.COa .W

.Un

.*

.C7u .mll

.COI1 ,CaO .Qx7 .mu .,Xaa ,mu .-

I ,tom

.Im

.lm ,m

.NM

,-

a

.SIB .m

,N

.nw .-

I ,Jam

.-

.Jmn

.luI

m. m m

,m .m

.OmI .Un

t .Csa

1,ma

.Kcn I.n?l I.llu 1.1=!7 I. MI, I,14M I.um I.ml I.m I.nm I.IU1 1.00 I.m 1.=1 I.1.1.7U1 I ,X40

.ms9 1.1,01 1.1111 ,.1!$! 1.an ,.ml I ,14M ,.ml I.MU ,.IU4 1 .*MI ,.4M ,.all 1.am I.llM :.ml 1.7SQ$ I,T3M

,COM X00

.m .011 .+4 .W .14s .In .ml ,m .m .W .m .Ua .ln .111 .Iu .UO .64s .I1'l

.lcn .0800 .M8c ,m lm [email protected] .Zall .Mti .ml .Mn ..Ual Oa .m .J7n .m .Um .IW1

I

l.aol 1.WM 1.Om 1.!s4 1.lMI l,lm 1.906 1.ml 1.s 1.m 1.4107

I. Oat 1,W I.m 1,1* I,lm 1.:11 1.m 1.04 I.IM 1,411 1,4s 1.44! 1.Ui I.m

I,nm I,t.,ca I,lm I.mm Lull My Lzy l.un I.I.1.4m l.um I.ml I.ul I,m, l,71m

I.lW

1.1s3 1.XM

..mil mu .Dw .00u .Mu ,Ocn .COu .m

SB m m m In m 18 m m m an m ,8 m m n

t.u-ei'

I.*1*

1.-4 l.1An-u

..m ,W .W .mn .Cw .Mll .m mu .,m .Mu ,Cal ,m 1,Jm I.m I.Ka 1.Um 1,W I.m I,nla l.nm I.mnn

:.m+

I.-

Mm-lo

,1X+84

"iw-a

1.5:s 1.s16 1.MI-S4 L*:O

.mu .JOu .m44 ,,JOu

1.4478 1,1C04 ,.1.!7s4 I.MM I .W

I,m I.m

1.m

1.7M-M

8

Downloaded from http://www.everyspec.com on 2012-07-01T19:45:31.

FEO-STCI-H28/3 31 March 1978 T.+m,a3.1. Sdadcd mmbinafimn, Uni&d aw --

h

rum lhti,

LN.S-Cmtin.cd

b-.

L_

W.

diuwul

mti

d!=-.R. M" Im.n9 .

,, --

w=

Mb --

m --

M",

--

Mb . 1

--

M.,.

Mm .

7 -- I Z7> 1.m18 1.51s I,cna 1.W 1.0102 I.mn a.0140 S.olm 2.lm 1,1128 ~ Z.17M i s. Iml S.M1l 9.9s47 1.8s71 tam *.m D.4% 2.4481 S,ma z.alm x ml a.mlo *mm

--

a -- &

.

* --

. 1

--

___ &%, -- --

1 -- -- 9

--

,0 --

n m m "m >B IB m

--

Mb -- ,1 -- ,,& I.m

--

M"

,

I.ml+ I.nslo i.mi-,4

s -- M 1A u u

Is --

Ma -- ,2

--

--

,4 --

.MM

,Xal, .Wn .mls .mm .0017 .001s

LA

,.67M I.m 1.07= I.wm I,CQM I.-

1.%4 I.%4

1.0!0, l.mw 1.8048 1.DW 1.98M 1. nma Z.osls 2.OU1 1.17M z. 1711 2.U5, Z.zam 1. U98 La,, I.mm *. aw s.tnl ?. ml S.ulo l,W *,na, s. nm 2.7$s7 2.0ss1 1.9679 ,,!411 l,1.0$74 1.1,9s10 1.W24 1.0m3 lolls

h

.aa .W .Mal mm .0M7 ,Cal

1 b

, ,7U4 , .7ss7 n.mu 1.BJ13 1.0107 1.CQ2

1.;3

L;*

I.&l

"hi

.Ka .Wn ,Cal Zen .007,

,ma .m

1. 1.?IM

,.mm ,.am

I,m

I,M6 ,,m

,.87s-11 ma-la l.ao-li ,,-11 M+3S-18 S.ms-in

,.ac-to !.*I4 S.xa+l

llm 1.1184 1.ml 1, ,.[16 I .=!4 1.W I. am 1.Iul S i.m

I.Im a.tqrl law

mm

IA IA .

u u ;; 1A m

I.31% 1.W ,.3M ,.:.= y. 1,mn I,Ma LMIS LM1l

).Mn I.mlo I,WU ;,M89

Mm

1 .Ma 1.*U /:= p.

.mld I.amo .CMca 2.CUE .mlo .Oca ,Joa .001? ,ml$ .m,l ,S?m ,mn [email protected] .mm .0017 ,001s ,00a ,GQn .0011 .mm .mlo s. lea s. Im S.wm Law a. sled ;.aloa S.ZIZ6 2.4s8 n. WI ;, <ml 1.<= S.<vu *.74m s. 71= `Z.7U4 s.mm Z.S9U

.COu ;$g ,Jal

.M4 .ma := .Mn ,OMl .C081 .Mn .Cnm .Ct47 .m .aa .Om .MIY .m ,.Om .m sum .Mll ,m .Cmu .mn ,m .-1 .am ,mwl .m .00s1

Mm :.g

].nm

S.tm

S,!ua #.mls 1.X1%4 %.nm t.nlo *. Icd2 *. ma s. U.m 1.4$!9 r.mn *,csm x 7010 x71m *am

t.iul

1,,49 ,.IE41 m.uam 1.ISI1

n,

.0083 S.lua

ma? z.

in an an

1,142 S.lal LIMO Lm

1.190 :. :.

1s3s

lm7

X18!

tam ~.

L ma

I.nm #.Ill, L MID km 1.m S.USO l,UM B.mn s.m 8.7019 S,?lm *.MM 1.96X ].aa Llm t,maa S,]m S,am J.4rM 1.4MS S,tuo S,79U Anaa 1.m14 ;.MM 4,!m 4.mu *.*am

%.s1a l

J,ml Km, s.m ;.0041 1. an S,4UI a,alz 1,4m s. m S,T!ll t m S.9U9 S.MI1 S,S7W z, 11.nla a.ml a.um 8.M1l 3.4711 Lam S.1111 ;.nll Mu] a.sm 4.IM1 t.mla 4.4441

M

u

,mhl

1.1!93

S. 1U16 S 9, 07s-18 *.6M-1* 1. KO-11

#.Kc-tn

:$C4J ;Z& ;Co#

.mm .OnM .CQhl .COm .mdl ,Xakl [email protected] .W mm [email protected]!4 .Cc34 .mba .C061 .,mm .0381 .00s8 ,mm .00a ,mm .mxl .0070 *.b$9! ?.3. Inl 2.4!07 9,4s02 a.msl 3.6CQ7 z,ean *.I7U S.WM :.v?al a.ltbl alma a.lmz 3,s783 ,.,,08 S.LMl a.all 3,MM am 2. 176Z [email protected] 4.lni 4.WM 4.s70

g

U m m lB m m m as m m as 2s 18 2B m m m :B w B ,8 m m lB lB

IA

u u u

Mu

mm

#.Ki I.UJ

S.oa Z,4U

IA

u u

l.lnm *.Im I.mn ;.W

a.mm

Z.mlo ?,W-84 S,WI1 I.om-lo

MOD-14 ,.mz# 8.-10 #. LM-14 a,sla J.bm-lo l-la 1. MO-11 3.7M-10 >. W+ 3,7M-IB 4.cm-10 4. KQ-14 4,-10 4, ZM-1* 4. CO5-10 k-t 4

:,4M 9.U4 X.642 Sal l,m

:.m

M M

u

I,W 8,7W 1.01s S.OM :.MI J. m

a.ms

S.tm Z.ma 2.MO 1.IU

a.lm

2A 2A

1A

*.ml 1,9D S.sun 2.9809 s. no. 2.mll s. 1=s S.*IZIa.mm s. Mm

1.4s87 a,mw 3.=7 S.7M7 1.3.s450 4. !759 f.!w 4.4X69

Loom

mm

.ml# 1.s$$4z. m .M18 s. Iwa S.m .Mls 2.:484tam ,W?z Am ,mln a.<=

,0017 .mii .m18 ,0017 .001, ,ml# m] ,W18 .mn 3.OI! s.14m 3,7MI 8,1*8I awn 3.1.117S a.mm elm

.COaO a. 14$0 S.zlm :.l O U

IA

2A

3. !7s S.lta Mm Lam

a.ua s.su

I.aa

M M 2A M 1A lA

u

w J. 0b3 >.

1.4m S.7W J.7W! a.?mo 2.WS a.sm I.nm *am 4. *IM Lam s.1.7018 8.71= :.?JYS S,9J18 4.lm 4.=M 4.U?J

1411 S,*SY 1.* S.ca

a,eu

8.4MS S.ula a.asl

S.m

a,m s.-

S.rQa

a:m

M a!

m

1.m 4,1U

4.in

;.W 4.1s

4,1U

2A QI1

4,a91 4,41s

9

Downloaded from http://www.everyspec.com on 2012-07-01T19:45:31.

FED-STD-H28/3 31 March 1978

T.,3,1, s&dd

E.-

am.bindim,

C.ijul q&al

IU.. thrd.,

L'NS4ntimmd

11

m-b k"?&

~m

.

bdiw.181 ----

M". w. M"*

Ml--

[

Mm

--

0 ,0 -- *7IM 4,ml 4.MM XB an an

__ Wm ---

,, -- ,,pi.

--

M.. -- In

--

-- ,

4 -- f, 4.4= 4.7471 1.7411

.

, __ 4%9 4.7,4, 4,,,,,

-.--

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FED-STD-H28/3 31 March 1978

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FED-STD-H28/3 31, March 1978

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FED-STD-H28/3 31 March 1978

Downloaded from http://www.everyspec.com on 2012-07-01T19:45:31.

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