inspectionmethodsforacceptability...

FED-ST&H28/20B10 Much 1994superseder.GFED-SIIWH28/20A21 Septenber1987

FEDERALSTANDARD

SCREWJHREADSTANDARDSFORFEDERALSERVICES

SECTION20

INSPECTIONMETHODSFORACCEPTABILITYOFUN,UNR,UNJ,M,ANDMJSCREW-THREADS

This standad was approvedby the Cmnissioner, Rx&al SupplySemite, GeneralSexvicesMmkktration, for the use of allHerd agencies.

AMSC N/A AREA THDS

DISTJUBWION STATEMENTA. Approvedfor publicrelease;distributionisunlimited.

Downloaded from http://www.everyspec.com

FEPS’IWH28/20B10 March 1994

IN’KRMATIONSHEETON FEDERALSTANDARDS

This FederalStaxlardis issuedin loose-leafformto permittheinsertionor r-val of new or revisedpagesand sections.

All usersof FederalStandardsshouldkeep them up to date byinsertingrevisalor new pagesas issuedand ~ing supersededandcanceledpages.

New and revisedpageswill be issuedun&r ChangeNoticeswhichwillbe nunberedconsecutivelyand will bear the date of issuance. ChangeNoticesshouldbe retainedand filedin frontof the Standarduntil suchtti as they are supersededby a reissueof the enttieStandard.

This sectionwas develo~ to provideinspectionEthods for acceptanceof products,which use 60° symmetricalinch and ~tric screwthreads,bYthe FederalSemites. It was originallydevelopedand widelycfilatedas Propsed Section20 of the NationalBureauof Standards(NBS)HandbookH28 by the Interdental Screw-ThreadCannittee(IS’IC)prior to itsterminationin Novenber1976. Responsibilityfor the standardwas thentransferredto the GeneralSenices Administration(GSA).

FED-S~H28/20 was preparedby the Efense Industrid SupplyCenter(DLA-IS). It incorporatedthe ~rican NationalStandardfor Screw-ThreadGagingSystensfor Unified (inch)Screw-Threadsand appliedthis to bothinch and nWric threadgaging. In addition,guidelinesfor systemselectionand refereerequir-nts were included.

FE&s’ID-H28/20Awas an updatedversionof FED-ST’PH28/20.In it, therequ~nts of ANSI/ASMEB1.3M-1986replacd thoseof ANSI B1.3-1979.

FED-S’lBH28/20Bis an updatedversionof FED-STD-H28/20A.In it, therquirexw?ntsof ASME B1.3M-1992replacethoseof ANSI/ASMEB1.3M-1986.Significantchangesincludethe folluwing: (1) hcorporatd _-ntof ChangeNotice1 dated 22 February1991; (2)deletd internalthreadsnap gages; (3)added~nnission to use unlistedgagesor HU.ringdevicesif resultscomlate with those listed;(4)addedevaluationofsurfacestextureby visualor tactile~ison with textures~fi~;(5)added linearand coordinate-uring machinesfor use in prahxtthreadevaluations;(6)notedthat even and odd-lo~ out+f-roundnessvariationsmy influencedi~ter ~asur~nts differentlydependingupongage ard ~asuring equiprentdesign.

ii

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FED-S’m-H28/20B10 Mamh 1994

Paragraph 1.

2.

3.

4.

5.

Table

scope ● **.*.....● ******.*9 ● *.*. ***m. ● ***..*.*

Referenceddocummts ● *****.***● ******.*. ● .**

Definitions● ****9.*.* .*** . ..m*m ● ****9*.*. . . .

-~ ~tsw99***. **9 ● **99.9*.. ● 9*m

Lwailed IxqlLimTr2n ts * ****9**.. ● *m **m*.*. ● **

5.1 Inspectionnethak and theirsel~ion ● 9*9m5.1.1 Establishedsystans . .*...**.. . . . . . . . . . . . .

5.1.2 Selection● ****..... . ***...... . . . . . . . . . . . .

5.1.3 system21 ..*..*..*● ..*.*..*● .....***● *.*.5.1.4 system22 ● .*.**..**......0......***..**..5.1.5 syS@IT’t23 ● .**.*.... . ...*... ● ..*..... . . . . .

5.1.6 SRXQ1 lot and nonstandardsize part

5.25.35.45.55.65.7

5.85.9

XX*1

XX*2

XX*3

considerations● *m**....* . ...**-... . . ...*..

Acceptability● ****.*........**.**● .........Specialinspectionconsiderations..........In-processcontrols..**....*....9.***..*.**Designationof inspection~thod ● *..*.**...Refereegaging 9*9**....*● ..*.*****.9*...*..Indicatinggagesand neasuringinst~nts -Spdal ~ts ● 89 -***m.* ● **9.*...* . . .

Workmanship~= for 9a9= .........Calibrationand inspectionof gagesandEasuring instrurrents..**...9.......*..● ...

Calibration~nts and s~ fexternalproductthreadgages ● ****9****● **Calibrationrequirementsand standards,internalproductthreadgages ● ******.*.● ..Calibrationqi~nts, settinggages ...

Pam

1

1

2

3

3

333445

566667

78

9

10

1824

iii


FE&STD-H28/20B10 March 1994

SECI’ION20 - INSPECHON METHODSFOR ACCEPTABILITYOF UN, UNR,UNJ,M AND l%?SCREW—THRENX

1. SGQE!2”

1.1 This standardestablishesthe l%deralServices’approvedins-ion and referee~thods for inch and ~tric dule (UN,UNR, UNJ, Mand N ) screwthxeads. The standardmy also be appliedfor Class 5interferencefit threads.

1.2 TIE inspection~thd sekked to s~ify prduct threads’acceptabilityfor the Federal-i=s shallbe in accordan= with thisstandard.

2. Referencedd~ nts.

2.1 GoWrnnent ~ublications.The issuesof the follawingd~ ts ineffecton the date of invitationfor bids or rquest for proposalform apart of this standardto the extentspecifiedherein.

FEDERALSTANDARDS

FE&~H28/ 1 - N~nclature, Definitionsand LetterSynbolsfor ScrewThreads

FEIMYI’D-H28/6 - Gagesand Gagingfor UnifiedScrewThreads-UN and UNR ThreadForm

FED+YIWH28/22 - Gagesand Gagingfor F’ktricScrewThreads-M and Ml ThreadFo~

FEDERALSPECIFICATIONS

~-lo5 - Caliper,llicr~ter (Inside,Outside, Tube) andGage,&pth Micr-ter

(-ivities outsidethe FederalGovernnsntmy obtaincopiesofFederals~if ications,standards,and c~rcial itemdescriptionsasoutlinedunderGeneralInformationin the Indexof Wderal Specifica-tions,Standards,and CmTEIVial ItemDescriptions.The Index,whichincludescumulativebi~nthly suppl~nts as issued,is for sale on asubscriptionbasis by the Su~rintendentof ~nts, U.S. GovernnwtPrintingOffice,Washington,K 20402.

(Singlecopiesof this standardand otherFederalspxifications,standards,and c~rcial itemdescriptionsrequiredby activitiesoutsidethe Heral Gove~nt for biddingpurposesare availablefrcxnthe @neral ServicesAdministration,Meral SupplySeNice Bureau,SpecificationsSection,Suite8100,470 L‘Enfant Plaza,S.W., Washington,DC 20407;telephone(202)755-0325.

\ L#ul-m J . Allccic LJl UUUC?GU Ou?ulbucbi Uu

1


FE&SI’D-H28/20B10 March 1994

(FederalGovernmnt activitiesmay obtaincopiesof -ral s~ifica-tions,standmis, and c~rcial itemdescriptions,and the IndexofFkxieralSpecifications,Standads and Cmrmmial Itemascriptions franestablisheddistributionpointsin theiragencies.)

MILATD-120 - Gage Inspection

(Copiesof Fderal and MilitarySpecificationsand StandaI& ~by contractorsin connectionwith specificprocummnt functionsshouldbeobtahed fran the procuringactivityor as dixectd by the contractingofficer.)

2.2 Othermblj‘catio= The followingdocumnts fom a part of thisstandardto the extentsp&ified he=in. Unlessa specificissueisidentified,the issue in effecton date of invitationfor bids or requestfor proposalshallapply.

Ai4EF71cANNATIONALSTANDANX

ASME B1.3M-1992-

ANSI B1.18M -

ASME/ANSI=7.1 -

ScrewTluead@ging Sys= for DimmsiomlAcceptability,Inchand MXric ScrewThreads(UN,UNR, UNJ, Mand MJ)

MetricScrewThreadsfor CanrercialMechanicalFasteners- Bamdaxy ProfileDefined

Gage Blanks

(Applicationfor copiesshouldbe addressedto the AnericanS=iety ofMechanicalEngineen, UnitedEngineeringCenter,345 East 47th Street,NewYork,NY 10017-2392or the -ican NationalStandmds Institute,11 west 42ndStreet,New York,NY 10036-8002.)

3. pefinitio~. The term applicableto this standardare definedinFED-S’I’&H28/l.

WI’E: ~ Etric threadgages have been i&ntified as MinimnnMaterial(Mn/Mt)ratherthan HI, LQ or WI’-GO. In thiss~f ~- for ~~ ~ ~ ~~ 9a9esW!VY togages identifiedas Mn/Mt.

2


FED-STBH28/20B10 March 1994

4. Generalrmuiremnts. An appropriateins-ion xmthodshallbes~ified for each applicationof UN, UNR, UNJ, M and ~ screwthreads.The inspectionmthod need not be indicatedat each threadcall~ut if it

is coved by a generalnote in any part of the prcrumm nt packageforthe thmeadedprcxhrt (specification,drawing,invitationfor bids,etc.).The ins-ion nethalmay be eithera standardgag~g system as providedherein,or a *f icationof a standardgagtigsystem;selectionwilldependon engineering~nts ~ cost consideratio~. Detailed=@remnts and guidanceare providd in the followings=ions.

5. Detailedreauirenmts.

5.1 Inmection mthods and their sel=ion.

5.1.1 Establishedsystem. T& gagingsystem for inspectionareestablishedhereinto providea choicede-g on the engineeringrequirementof the threadedprakt. Theseare identifid as System 21,22 and 23.

5.1.1.1 systems21, 22 and 23 are in accordancewith ASME B1.3M-1992for UN, UNR, UNJ, M and MJ threads. It is recawended that for System23,sizenEas~nt valuesbe required.

N(YI’E:System21A in ASME B1.3M-1992is used only for mtric threadsspecifi~ in accordancewith ANSI 131.18M.

5.1.1.2 For specialapplications,the screwthreadon a threadedprduct my requireinspxtion not consistentwith any of the standardgagingsystem. In suchcases,one of the standardgagingsystm shouldbe selectd and tified by specifyingthe additioml threadcharacter-isticsand gages franTables 1 or 2 in ASME B1.3M-1992,as applicable.

5.1.2 Selection. Sincemst screwthreadapplicationsdo not requirethat all of the featuresdescribedin the applicablesectionofFE&STD-H28 be inspected,selectionof the appropriateimpction ~thodwill be based on those featuresimportantto the end use. Considerationshould& given to such factorsas form,fit, functionand fabricationofthe threadedprahrt. The cost of inspectionshouldbe cmpared to thepossiblecosts resultingfra uncertaintiesinherentin each ins-ionmthod . Guidancefor sel~ion of an ins-ion ~thod frcm the threestandardgagingsystem is as follcxvs:

3

. ——.—-—.._._ . .=. . _



5.1.3 Ewstem21.

5.1.3.1 System21 providesfor interchangeableassemblywithfunctionalsize controlat the maxinm mterial limitswithinthe lengthof standardgagingelements;and also controlof characteristicsidentifiedas NOI’~ functionaldiamters or as HI (Internal)and ~(-ti) functioml diamters. These fu.nctiomlgagesprovidesmcontrolat the minimm mterial limitwhen thereis littlevariationinthreadform characteristicssuch as lead,flankangle,taperandroundness.

5.1.3.2 System21 is suggestedfor use under~ one (ormm) of thefollowingconditions:

a. Wherethe threadsof the prahrt do not need specific=hanical strengthproperties,or wheremchanicalstrengthrequimm nts are not specifiedfor the praiuctthreadsby eithermaterialstrengthand dimensionallimitsor by testingstrengthof the threads.

b. The threadedproducthas all the mchanical propertiess~ified; xrechanicalpropertytestingof the threadsismquimd; and the testing~S t~t the sc~t~abbe subjectto shearand beam loadingbymtching threads(i.e.,full size tensiletestingof externallythreadedproductthreadsand fullsizeprmf-load testingof nuts).If the threadshave a lockingelementincorporated,lockingtoryuevaluesand testsmst be specifiedand runon matchingthreadsinspectedby eitherSystem22 orSystem23.

c. For stardard,off-the-shelf,generalapplicationfastenerswhen consideredacceptable.

d. Internalthreadis lessthan 0.190inch (51nn)nmhalsize.

5.1.4 svstel11220

5.1.4.1 System22 providesfor interchangeableassexrblywithfunctionalsize controlat the maxinummateriallfits withinthe lengthof standardgagingelemnts; and also controlof the minimnnmterial sizelimitsover the lengthof the full thread. Otherthreadcharacteristicssuch as lead,flankangle,taper and roundnessvariationsm confinedwi~ these limitswith no specificcontrolof thefinqnitudes. For UNJand MJ externalthreads,controlis also prcwidedfor the threadrootradiusand roundedrmt minordiamter.

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5.1.4.2 syS@?Il22in paragraphs5.1.3.2

5.1.5 sVStE?lll23.

5.1.5.1 System23

~H28/20B10 March 1994

is suggestedwhen none of the conditionsspecifiedor 5.1.5.2are applicable.

providesfor interchangeableas*lY withfunctionalsize controlat the mxinum materiallimitsWitkl the lengthof standardgagingelmmts; and also controlof the~ materialsizelimitsover the lengthof the fullthread. Tk mgnitude of otherthreadcharacteristicssuch as lead,flankangle,taperand roundness are furthercontrolledwithinthese limits. For W and l!$Jexternaltids, controlis also providd for the tlm4 root radiusand roundedrmt minor titer.

5.1.5.2 system23 is suggestedfor use underam one (ornme) of thefollowingconditions:

a.

b.

c.

When threadelenmt controlis requiredto de~ theextentof deviationin any of the elemmts of the thread;normallys~ial applications.

For threadedprakwt used in researchinvestiaatiomandtestingto determinethe effectthat a specifictheadelemnt variationhas on the attributesof the tkeadedproductor the attributesof the threadedproduct’sapplication.

The conductingof investigationand testinqin analvsisofthreadfailures. d

5.1.6 Small lot and nonstandardsize mrt consideration.

5.1.6.1 When gagesand masuring equipmmt applicableto the specifidinspectionsystemare not economicallyfeasible,as when smll productionlotsor nons~ size parts m beingprocured,otkr ~uringqip=nt may be agr=d upon by the partiesinvolved.

?WI’E:There is no masuring mthod exactlyequivalentto a GO threadgage used to ckkmxinm mterial. An approximatevaluemybe calculatedfran singleelemnt masurexnmts of pitchdiamt-, tap2r,roundness,flankangle,lead and helicalpath.

5.1.6.2 For mall lots,where it is impracticaltoti~ ~ds bysqMng md destructiw strengthtesting,subjectto prwisiom in thePrmuremnt daxmnt and agmemnt by the partiesinvolved,100%inspectionof screwthreadsin accordancewith System22 or 23 my bsubstituted.

5


FEMYrEH28/20B10 March 1994

5.2 Acceptability.Screwthreadacceptabilitycriteriaare inamordance with Section6 of ASME B1.2M-1992.Also see subsection5.7below.

5.3 sRecial ins~tion considerations.

5.3.1 Wre prcductthreadprofilehas been defend or mdified, itmkes the gagingoperationinconclusive.A performancetest shall~conductedas required~ the applicablespecificationfor tensilestrengthor fatiguestrengththat loadsthe threadsin shear.

5.3.2 If the shapeof a caponent containingscrewthreadsfiterfereswith the physicalshapeof the specifiedgages,partiesinvolvedshallreachan agreenmt on the ins-ion mthcxl.

5.3.3 All referencesto xunout,concentricity,perpendicularityandsquarenessof threadrelatedsurfacesshallbe as follows:

a. ml referencesto the threadare to be frm a cylinderwitha diamter equalto the functionaldiamter of the threadunlessotherwisespcified.

b. Runoutand concentricityare full indicatormvemnts for360° rotation.

5.4 In-mocess controls. Variousthreadgages/mmfacturing-h.niques may be used by the manufacturerfor i.n-pr-ss control.However,the finalproductshallconfom to the requ~nts of thespecifiedgagingsystem.

5.5 Decimation of ins-ion mthod. The inspectionmthod for eachthreadedprduct shallbe either: (1)coveredby a generalnote in theprocurementpackage (specification,drawing,invitationfor bids,etc.);(2)indicatedat the individualthreadcall-out;or (3)a combinationof ageneralnote to coverthe mjority of threadsand individualt-dcall-outindicatorsfor the exceptions. A generalnote shalldesignateastandardgagingsystemor a modificationof a standardgagingsystem. Anindividualthreadcall+ut shallshow the standardgagingsystemnunberinparenthesisfollowingthe threadtoleranceclassdesignation;an “S” shallbe addedto the gagingsystemn-r if the standardgagingsystemismciified. Detailsof designationare in accordancewith Section7 of ASMEB1.3M-1992which includesexanples. Exception: Referencein thestandardnotes shallbe FED-S0H28/20. Thus,a drawingnotewould read:“~ptability of screwthreadsshallbe in accordancewithFED--H28/2O, [email protected] “.

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~H28/20B10 March 1994

5.6 Refereeaauing.

5.6.1 GagingSysters21, 22 and 23 pmitmre than om type of gageto be used for the inspction of screwthreads;howver, incase ofadisputeon acceptability,any gagewhich is permitted by the specifidsystemmy k usd, provi= that it is withintolerance. The gage ortreasuringinstmmnt for refereePUrpses shallmet its calibration~nts as s~ified fi T~le xx.1 for =+@rnal threadsor TableXX.2for internalthreads. see paragraph5.9. Also, the settinggage orstandardused to verifythe gage or masuring imtmmnt shallmet itscalibrationrequirenmts as specifiedTableXX.3.

5.6.2 Size masurmmt valuesprovidethe prmummnt agencywith amthai for judgingacceptanceor rejectionof partswhichdepart fran thespecifid limitsof size. Use of equi~nt for sizemas ummnt is onlymandatorywhen specificallye. -

5.6.3 For opticalprojection,the followingminimummagnification=!@-:

PITCHPER lXH INMM MAGNIFICATION

up to 14 MOE than 1.75 20X14 up to 40 1.75to 0.6 50X40 and up 0.6 and less loox

.

is

5.6.4 Excessiveforceshallnot be applid to ~, NOT-, HI or LOgagesor to hand+peratedmasuring inst~nts. ~y light-hand pressureshallbe used.

in5.6.5 Indicatinggage and nEHsuring instrummt ~nts still &

accordancewith subsection5.7.

5.7 Indicatingqaqes and masurinq instruments- s~ial r ‘eaummmts.

5.7.1 The smallestscaledivisionon the indicatinggage or themasuring instrumnt shallbe no greaterthan 10% of the prduct featuretoleranceand the accuracyof the indicatingsystemor masuringinstrumnt used on productthreadsshallbe within*1O% of the producttolerance.

Exa@e: For 1/4-28UNF-3A,the pitchdiamter producttoleranceis 0.0025inch. The smallestscaledivisionon theindicatordial is 10% of this tolerancewhich is 0.00025~h~ R%@@ a~a~ is tlo% of the producttolerancewhich is ~0.00025inchwithinthe actualmasureddistance●

7

.1



5.7.2 The amuracy of calibrationof the settinggagesused forsettlingdisputesshallbe the lesserof either~ W gage toleranceor~0.0002inch (0.005m). The dimmsional standads (usuallytoleranceGrade 3 gage blinks)used for referencingmasuring instrumentsfor thecalibrationof the settingand workinggagesshallbe accurateto *1Omicroinches(0.00025inn).

—

5.7.3 The vernierscaleon anglemasuring instrumentsshallbe 1minuteof arc or less.

5.7.4 ~st for rem tabilitvof indicatingqaae or masurinqinstrumnt. The mchanical operationof the indicatinggage or masuringinstmnmt shallbe testedby takingsufficientrepeatmas uremnts at thesam place on the settingmaster. The rangeof masuremnts shallnotexceed 10% of the productthreadfeaturetolerance.

5.7.5 Was ummnt msi,tionson mmduct threads. For productthreadmamremnt, wheneverpracticable,take sufficientmasurawts aroundtheproductthreadaxis ne& the frontend, near the centerand near the backend to ensureacceptance.

5.8 Workmnshi~ reuuiremnts for aaqes.

5.8.1 Dimnsions and tolerancesfor productins-ion gagesshallbein accordancewith FED-S~H28/6 for inch and FED-S’lBH28/22for mtricthreads. TablesXX.1 and XX.2 tabulate“CalibrationRequimmnts forGagesand ~uring Equipnt” to denote-trical elemnts andrelationshipsbetweeng~trical elenmts whichmst be withins~ifiedtolerancesfor ameptable workinggages. Also listedare traversing,amplification,magnificationand geometricalrequtiemntsof the masuringinstruments.Tabulationof “SettingGagesand Standards”&notes gagesused to set or verifythe workinggagesor masuring equipnmt. Also seesubsection5.7.

5.8.2 Dimmsions and tolerancesfor settingthreadand plaingagesshallb in accomiame with FE&SDH28/6 for inch and FED-ST&H28/22formtric threads. Calibration~iremnts for gecmtrical elemnts andrelationshipsbetween_trical elemnts whichmst be masumd andwithintolerancefor acceptablesettinggagesare tabulatedin TableXX.3.

5.8.3 Gagingsurfacesof all gagesshallnot havegecmtricirregularitiesex~g arithmtic averageroughnessRa of 16 microinches(0.4micrmter) for threadgage crestsand 8 microinches(0.2mi.craMer)for threadflanksand plaingagingcontacts.

8 —


5.8.4 N1 gages shallbe suppliedwithsteelor with contactsurfacesof tungstenmterial. Thermaltreatmnts mst provide


gagingsurfacesof hardenedcarbide,ciiamnd,or similarnwinm wear life and

dimensionalstabilitywith hardness-tobe no lessthan 56HRCfor steel.Steelssuitablefor this applicationinclude: O-1 (UNST31501),O-2 (UNST31502),O-6 (UNST31506),carbonized8620 (UNSG86200)and 52100 (UNSG52986).

5.9 Calibrationand ins= ion of ua~ and measurinainstmmn ts.

5.9.1 Threadinspction gagesand masuring instrumentsshallbemaintainedwithintolerance.

NOI’E:Date of a gage calibrationreportis not necessarilya neamreof the gage reliability,&aUse wear on gagesis determinedby usage. Gageskept in a cleaninspectionarea and carefullyused my hold theircalibrationfor mny years. A new gage,justcalibra~, my be worn out of tolerame in just a fewhourswhen used improperlyor in an abrasiveor coxrosiveenvironment.Everycharacteristiclistedin TablesXX.1,XX.2and XX.3 is not subjectto wear and, therefore,need not becheckedeach tim gage is recalibrated.

5.9.2 Proceduresfor calibrationand ins-ion of gagesmay be foundin FEPS~H28/6, MIL-STD-120and manufacturer’sproceduresdescribingtheirinstruments.

5.9.3 When satisfactorygagecalibrationrecordsare not available,refer= gagesshallbe calibratedand foundwithintolerancebeforeusingthem to settlea dispute.

5.9.4 This standarddoes not requirethe manufacturerto add toetistingGovemmnt requirementsfor gage recordkeeping.

9


FEPSTD-H28/20B10 March 1994

TABLE )(X.1~ -4z

EWIPMHWFWR EXTERNALPRODWI’[email protected]\

THREAD-WMEASUIUNGEQuI~

(REP: ASME B1.3M-1992TABLE 1)

1. Threadrings (ASME/ANSI B47.1 SplitorSolid)1.1 GO ring

1.2 IQand NUI’arings

2. Threadsnap gages2.1 GO segmmts

2.2 m and NuI’asegmnts

2.3 @ rolls(zerolead)

2.4 IDandNUI’=rolls (zerolead)

m=~ ~mRGAGEsANDMEw-

EQUIPMENI’(a) (b)

W (alsohelicaloffsetat split),flankangles?minor diamter, pitchdia-mter, taperof pitchcyl-inder,straight-s, round-ESS, clearanceat root (f)

Lead (alsohelicaloffsetat split),flankangles,minor diamter, pitchdiameter,taperof pitchcylinder,straightness,rourdness,clearanceatroot (f)

Lead, flankangles,minordiamter, pitchdiam=,~, stitightn=s, CkU-ance at rmt (c) (d) (f)

Pitch,flankangles,minordiamter, pitchdiamter,cl~ance at root (c) (d)(f)

Pitch,flankangles,widthof flatat crest,taperofpitihcylind= on -hroll,parallelismof axesof rolls,clearanceatrmt (c) (d)

Pitch,flankangles,widthof flatat crest,clearanoeat root (c) (d)

SE’ITINGGAGESAND STAMMDS (k)

w thread

plug for

Wthmadplug forNM’-m

w thread

plug for

Wthreadplug for

settinga)

settingIllor

setting~ (9)

settingLO or

~~ (9)

w threadsettingplug for ~ (g)(h)

W threadsettingplug for LQ oror DKYT-GO(g) (h)

see page 25 for footnotes. —

10


FED-~H28120B10 March 1994

‘I!AELEXx.1 CALIERATION~ AND ~mllx~THREADGKES. INDICATINGGAGES.Z TOLERANCEPIAINGAGESAND MEAsURINGEOUIPMENI’KIR EXTHUWL PROD~ THREADS{SEEPARAGRAPH5.8.l\- (Continued)

‘rHRmDGAGEsANDMEAS- EQUIPMEm

(REP: ASME B1.3M-1992TARLE 1)

2.5

2.6

2.7

. .Mmmunn material- pitch diamte~type - cone and

. .Mmmnn material- thread grmvedimter type -cone only - bestwire size

.Minilnurnmterial

3. Plain3.la

-Band CNOI’=rolls or s~-mnts (System21A only)

diamter gages.MaXlmnnplaincylindrical(20ring for mjordiamter

25 for fOotnotes●

~Pm(a) (b)

Pitchof vee, width of flatat crest,heightof thread(C) (d)

Radiusof contactscorres-pondingto besttie size(C) (d)

V- gap at crest,conewidth at crest,flankangles,contactheight

Taper,straightness,roundness,diamter

flat

(c)

SE!ITING GAGESAND STANDARDS(k)

W threadsettingplug for LO orKYT= (g) (h)

W threadsettingplug for LO orw-m (g) (h)

w threadplug forNma

settingLO or

Seriesof plainplug gagesin(0.0001inch(0.0025rrrn)stepsor directdiamtermasuremnt withinternalmasuringequipmt usinggage blinksequalto the ~mjor diamter

1 11–vK-lY - I 1..111 : I I -?- AL,-


FED-SIIPH28/20B10 mrch 1994

p~H 5.8.l\- (Continued)

THREAD-ANDMEASURINGEQUIPMENT

(REF: ASME B1.3M-1992TABLE 1)

3.lb MininumplaincylindricalWI’4D ring formjor diamter

3.2

3.3

3.4

Majordiamtersnap type

Minor dimtersnap type (550max includedangle)

mjor diamtersnap type

CALI-1~ ~FUR GAGESAND MEASURING

EQUIPMEm(a) (b)

Taper,straightness,roundness,diamter

Parallelism,flatnessofconticts,distancecontacts

between

Pitch,diamter, includdangleof threadfore,clearanceformat tips ofsnap contacts

Parallelism,flatnessofcontacts,distancebe=ncontacts

SEITIIWGAGEsAND STANMDS (k)

Seriesof plainplug gagesin0.0001tih(0.00251Trn)stepsor ~ diamtermasummnt withtiteti masuring~~nt usinggage blinksequalto the mmimmmajor diamter

Plain Z tolerancePlug gage or gageblockswith rollComspmding tonwinm majordiamter or direct~uremnt

Plain Z toleranceplu9 gage or 9a9eblinksequaltothe nwcimm minordiamter or directmasmremnt

Plain Z toleranceplug gage or gageblinkswith rollCom?spond.ingtomucimnnor~mjor diamter ordirect masummnt

See page 25 for footnotes.

12


~H28/20B10 March 1994

TAELE X)(.1 CALIERAXION~ AND STANUWX F13RXTQURAKE

PMEmm EmERNALPRCHIUm~ tSEEPARAGRAPH5.8.1~- (Continued)

—

T’HREADGAGESANDMEASURINGEQUIPMENI’

(REF: ISME B1.3w1992TABLE 1)

3.5 “Mammnn/nlinimmminor diamtersnap type (55°m tiludedangle)

4. Indicatingthreadgageshavingeithertwo contactsat 180°or threecontactsat120°4.1.14.1.2

CD segmnts

4.3.1 ~ rolls4.3.2 (zerolead)

4.5.14.5.2

see page

Mininum xrwe-rial - pitchdiamtertype - coneandvee

25 for footnotes.

Pitch,diamter, includedangle of threadfore,clearancefom at tips ofsnap contacts

Lead, flankangles,minordiamter, pitch diamter,taper,straightness,clearanceat rmt, minorcylinderto pitchcylinderrelationshipof segmentsfor c~ality, see para-graphs5.7.1and 5.7.4(C) (d) (f)

Pitch,flankangles,minordiameter,taper,straight-ness,parallelismof axesof rollsto each other,runoutof rollsto tis,clearanceof root,seeparagraphs5.7.1and 5.7.4(C) (d)

Pitch,width of flatatcrest,heightof thread,runoutof rollsto axis,see paragraphs5.7.1and5.7.4 (c)

SEI’TING GKEsAND STAmARM (k)

Plainz toleranceplug gage or gageblocksequaltothemmimnnorminimm minordiamter or tiectneasurenlmt

w thread

plug for

Wt.hmadplug for(h)

W threadplug for

setting~ (9)

settingm (g)

settingQClor

for basicpitchdieter or forLOorF#X~ (g)

I (h)

13

- I I -—x m -3 I -1 .


FED-S’ID=H28/20B10 March 1994

TABLEXX.1 CALIBRATIONREOUXREMWISAND~~Rx ~THREADGAGES,INDICATIlW2GAGES,Z mmRANCEPLArNGKES

EXTERNALPRODUm THREADS [SEEPARAGRAPH5.8.1~- (Continued)

THREADGAGESANDMEASURINGEQuIPMEm


4.6.1 Minimm mate-4.6.2 rial - thread

groovedim-eter t~ -cone or bestwire sizeradiusprofile

4.7

4.8

Majordiameter/pitchdiamter run-out gage

Differentialsegmnts orrolls; (~profileforone pitch inlength)usedin canbinationwith Q3/rniN-mm mterialindicatinggagesto yielda diameterequivalentforvariationsh1- (includ-ing uniformityof helix)andflankangle

Radiusof contact,mnoutof rollsto axis, seeparagraphs5.7.1M5.7.4 (c)

Pitchand flankanglesof threadsegmntststraightnessof plaingages,majorcylindertopitchcylinderrelation-ship of segmnts for c-axiality,s= paragraphs5.7.1and 5.7.4 (C) (d)

GO profileof one pitchs~nt or roll -sflankanglescheckedGO full formsegmnts;S= 4.1.1/4.1.2aboveGO fullfom rollssee4.3.1/4.3.2abom. .Mmlmnn material- pitchdiamter type - cone andvee; S= 4.5.1/4.5.2above. .~ mterial - threadgroovediamter type - coneonly - bestwire size;See 4.6.1/4.6.2aboveSee paragraphs5.7.1and5.7.4. Use manufacturer’sinstructionsfor assessingthe ITeasummnts for &ameter equivalentsfor vari-ationsin leadand flankangle (d)

SmTm GAGESAND SmmARDS (k)

W thread settingplug for LQ orfor~~ (g) (h)

None

(Followingnotre@=d) ●

S~ial ladstandardsandflankanglestanda-rds with genera-ted variationportionand nearperfectportion

See mae 25 for footnotes.L J

14


HID+I’&H28/20B10 March 1994

TABLEXX*1 m~ANDSTNWMRE mx~a z~U-

(SEEPARAGRAPH 5.8.1\ - (Contiud)

THREAD-AND

-- ~(REF: ASME B1.3M-1992

TABLE 1)

5.

6.

7.

4.9. Minimnlm-rial - Bard CM-GO rollsor segmnts(system21Aonly)

Indicatingplaindiamter gages5.1 M3jor diamter

type

5.2 Minor diamtertype (550mincludedangle)

Pitchmicrmeterw/standardcontacts(approximatelyLO orFUT= profile)coneand V=

Pitchmicr~terw/mdified contacts(a~rofitely PDcontact) cone and veeandvee

Vee gap at crest,coneflatwidthat crest,flankangles,contactheight (c)

Parallelismand flatnesscontacts;see paragraphs5.7.1and 5.7.4 (d)

Pitch,includedangleofthreadform,width of flaton crests;see paragraphs5.7.1and 5.7.4

Pitch,flankangles;see~-105 for amura~~n- - -t Pr-cedum; convertcustmaryunitsto mtric as required

Pitch,flankangles;widthof flatat crest,heightofthread;see =-105 for~a~ ~ts ~test procedure;convertcustmary unitsto mtricas~

sEmINGGAGEsAND SmNRARM (k)

w~plug forIwr-a)

settingLO or

Plain z toleranceplug gage for GOor basicmajordiamter or gageblocks

PlainZ toleranceplug gage forbasicminor dim+eter at radiusedroot

w threadsettingplug for basicpitchdiamter, or~, or IO, orN(Yr’-m(g)

w threadsettingplug for basicpitchdiamter, orQQ, or IO, orFKYI’a (g)


15


FED-S’ID-H28/20B10 March 1994

?~H 5 8J1● - (Continued)

THREADG?GESANDMEASURINGEQuIPm

(RET: ASME BI.3M-1992TARLE 1)

8. Threadmasuringwires (bestsize)with suitablemas-uringmans

9.

10.

11.

12.

13.

14•

Opticalcmparator 01toolmakersmicroscopew/suitableftiuring

Profiletracing

~~~~ ‘/suitAle

Lead masuringmachinew/suitablefixturing

Helicalpath attach-nmt used w/GQ typeindicatinggage

Helicalpath analyzer

Plainmicral@er/calipers- mdifiedas required

cALI=I~ ~FORGAGESANDMEASURING

EQUIPMENT(a) (b)

Flatnessand parallelismofspindleand anvil faces,screwcalibration,nmmr-ing force;see paragraphs5.7.1and 5.7.4

Micr-ter stage,magnif-ication,radiuschart,pro-tractorhead; see para-graphs5.7.1and 5.7.4 (c)

Use mnufacturer’sinstruc-tionsto ckk out stylustraverseand electronicamplification

Traversingsystem,straightnessof ways,stylusradius;see para-graphs5.7.1and 5.7.4

Lead,flankangles,ta~r,straightness,clearanceatroot;see paragraphs5.7.1and 5.7.4 (C) (d)

Use mnufacturer’sinstruc-tionsto test the mchani-cal and electronicfeatures

-&y-! ~- convertcustm

ary unitsto mtric as~

Smrnw GAGESAND SmmARDS (k)

Calibrated(bestsize)threadmasuring wiresand gage block

Gage blocks,pluggages,sine bar

Specialangleblocksuppliedwith instrument

Lead standard,gage blinks

Lead standard

Lead standard

Gage blocks,orcalibratd plainplug gages

i


16


FED-STD-H28/2oB10 Mamh 1994

XX.1 CALIBRATION~ AND STANMRm FuRxmLERANCE

fs=PARKRAPH 5.8.1}- (Continued)

THREAD-WMEAs- EQuIPMEm

(RET: ASME B1.3M-1992TABLE 1)

15.

16.

17.

18.

Surfacemasuringequi~nt

Roundness/Radialvariationmasum-mnt equipmt

Linear masurtigmachinewithrequiredaccessories

Coordinate~uringmchine with requiredaccessories

Ipage 25 for fmtnotes.

Use manufacturer’sinstruc-tionsfor calibrationprdures

Use mnufacturer’sinstruc-tions for calibrationprocedures

Use manufacturer’sinstmc-tions for calibrationprocedures

Use manufacturer’sinstruc-tions for calibrationprocedures

SEITIMGAGESAND SWWDMUX (k)

Visual,tactileW p=isiontracertyperoughnessstand-

Precisionglasssphere,roundnessmagnificationstandad, gageblocks

Asmquimdinmanufacturer’sinstructions

Asm@redinmanufacturer’sinstructions

17


FEIH7rBH28/20B10 March 1994

TARLEXX.2 calibrationRmmmMNEANDSmNDM@S mR x ‘IOLERANCE# INDICATIKlGAGES.zTUmRAKEPLIAIN@KES

(SEEPARAGRAPH5.8.l\

THREADGAGESANDh’lEAsuRINGEQUIPMENI’

(REF: ASME B1.3kf-1992TARILE2)

1. Threadplug (ASME/ANSI B47.1)1.1

1.2

1.3

1.4

m plug

HI and NCYI’~plugs

FUll fom gagem plug (UNJand w only)

Band CN(YI’-CX)plugs (system2n only

2. Threadsnap gages(Ikleted)

3. Plain3.la

see page

diamter gages. .Mlnlnumplaincylindrical~plug for minordiamter

25 for footnotes.

Lead, flankangles,mjor diamter, pitchdiamter, taper,straight-ness,roundness,clearanceat root

Lead, flankangles,m jordiamter, pitchdiamter, taper,straight-ness,roundness,clearanceat root

d, flankangles,mjor diamter, pitchdiamter, minor diamterat radiusedroot,taper,straightness, ~SS ,root radius

Type B: Lead, flankangles,m jor diamter,width of flat at crest,contactheight,masure-mnt over h best size*S, taper,straightness,roundness,clearanceatroot~ c: S- as 1.? above

Taper,straightness,round-ness,diamter

SEITING GAGESAND STAmAms

Threebest sizewires

Thee best size*S

Threebest sizewires

Threebest sizewiles

Gageblocks

-—

> —-

18

CL I Uvl I I


TABLE

FED-ST&H28/20B10 March 1994

XX.2 FQRX~

PARAQ?APH5.8.l\- (Continual)

THREADGAGES ANDMEAsuRrNGEQuIPMEm

(REP: ASME B1.3k1992TABLE 2)

3.lb ~ plaincylindricalma plugfor minordiamter

3.2 ~ mjordiamter smptype (550mincludedangle)

3.3 Mkinlnnminordiamter snaptype

3.4 “Mmlnlm/nlini3rummjor diamtersnap tp (550H includedangle)

3.5 “Maxmml/lninhmminor diamtersnap type

1

footnotes.

CALIBRATIONREQUIREMENT~RGAGESANDMEASURIK

EQUIPMENT(a) (b)

Taper,straightness,ness,diamter

round-

Pitch,includedangle,dimnsion over segmnts,width of flatat crests(c)

Taper,straightness,coaxi-alltyof cylindricalseg-nwts, ciimmsionoversegmnts (c)jaws

Pitch,includedangle,dimmsion over saynmts,width of flat at crests (c

Taper,straightness,coaxi-alityof cylindricalseg-mnts, dimnsion oversegmnts (c)

sETrrNGGAGEsANDsTAmAms

&Je blocks

PlainZ tolerancering gage for ~mjor diamter orgage bldcsbetweenjaws

PlainZ tolerancering gage for GOminordiamter orgage blocksbetweenjaws

Plain Z tolerancering gage for GOmajor diamterPlainz tolerancering gage for HIor N0T40 mjordiamter or gageblocksbetweenjaws

Plain z tolerancering gage for GOminor ciiamterPlain Z tolerancering gage for HIor ~~ minordiamter or gagebldcs Mneenjaws

19

I I


FED-STII-H28/20B10 March 1994

TARLE XX.2 CALIBRATION~ANDSmNDARmFuR xmLmAICE

EOUIPmm mTERNAL PRODUCTTHREAD5 (sEPARAGRAPH5.8.1\ - (Continued)

THREAD GAGES ANDMEASURING EQUIPMENI’


4. Indicatingthreadgageshavingeithertwo contactsat 180°or threecontactsat120°4.1.14.1.2

4.3.14.3.2

4.5.14.5.2

4.5.14.6.2

G3 segmnts

GO rolls(zerolead)

erial -mat-

pitchdiamaer type

-Cone andvee

. .mnumnn IrEat-

erial - threadgroovetype -cone or bestwire sizeradiusprofileor best sizeball contacts

page 25 for footnotes.

Lead, flankangles,majordiamter, pitchdianEter,taper,straightness,clear-ance at rmt, major cylinde~to pitchcylinderrelation-shipof segmnts for coaxi-ality;see paragraphs5.7.1and 5.7.4 (C) (d)

Pitch,flankangles,mjordiam~, taper,straight-ness,clearanceat root,parallelismof axes ofrollsto each other;seeparagraphs5.7.1and 5.7.4(C) (d)

Pitch,width of flat atcrest,heightof thread,see paragraphs5.7.1and5.7.4 (C) (d)

Radius of contactsor balldiamtem, see paragraphs5.7.1and 5.7.4 (c)

SETTING GAGESAND fmAmmDs

SolidWsettingring forGO orpitch(9)

Solid

basicdiameter

W tlueadsettingring forQ3 (g)-(j)

SolidWsetting

threadring for

03 or HI or hWT-Q3 or basicpitchdiam- (g) (j)

W threadsettingring for HI orKYI’= (g) (j)For ball con-tacts:PlainZ tolerancering gagewhosediamter is ~icpitchdiamterplus 1/2 the kstball size

20


FED-SYI’D+28/20B10 March 1994

r

● INDICATINGGAGES,z mLERmCEPL?srN GAGESAND MEASURINGEOUIPMENI’KIR ImERNAL PRODWI’THREADS (SEEPARAGRAPH5.8.1~ - (Continued)

THREADGAGESANDMEAsuR,TrJGEQuIPMEr?r

(RER ASME B1.3M-1992TAELE 2)

t

I

II

4.7 Minor diamter/pitch diamterrunoutgage

4.8 Differentialsegmnts orrolls: (~ pr~file for onepitch in length)used in c@ina-tion with GO/minimnnmterialindicatinggagesto yield a dim-eter ~ivalentfor variationsin lead (includ-ing Uniformityof helfi)andflankangle

page 25 for footnote

CALIBRATIONREQLIXREMEMEmGAQ3SANDMEAsUFm

EQUIPm(a) (b)

Straightnessof plaingagesegmnt, pitch,flankangle,straightnessof threadseg-mnt, minor cylindertopitchcylinderrelationshipof segmmts for coaxiality;see paragraphs5.7.1and5.7.4 (C) (d)

GO profileof one pitch inlength,segmnt or roll,requiresflankanglescheckedGO full form segmnt; see4.1.1/4.1.2aboveGO full fom roll; see4.3.1/4.3.2above, .hWunnnnmaterial- pitchdiamter t~ - cone andvee; see 4.5.1/4.5.2above. .Mmnnnn mterial - threadgroovetype - cone only;See 4.6.1/4.6.2above;See paragraphs5.7.1and5.7.4. Use manufacturer’sinstructions

SE’rmw GAGESAND SmNmRDs

None

(Followingnot=@-re d)*sF-ial internalleadstandardand in-ternalflankanglestandardwith generatedemors portionand near perfectportion

21

I I


FEP-H28/20B10 March 1994

‘rAELE )(X.2 ~AND s~mx~THREAD GAGEs, rNDK2ATrNG GAGES, z TmmANCE PLAINGAGES

(SEEPARAGRAPH5,8 .11- (Continued)

THREAD~ANDMEAWRmG EQuIPm

(REF: XME B1.3M-1992TAELE 2)

5.

6.

7.

4.9 Minimumrote-rial - Band CW+3 rollsorsegmnts (System21A only)

Indicatingplaindiamter gages5.1

5.2

Major dianetertype (550mincludedangle)

Minordiamtertype

Internalpitchrnicro-mter w/standardcon-tacts (a~ro~telyHI or ~~ profile)cone and Vee

Internalpitchmicr~interwhmdified con-tacts (qrotitelyPD contact)cone and

-mQN ~FOR -AND MEASURING

EQUIPm(a) (b)

~ B: Pitch,flankangles,width of flat,contactheight (c)TypeC: Pitch,flankangles,mjor diamter

Pitch,includd angleofflanks,width of flatoncrests;see paragraphs5.7.1and 5.7.4

Straightness,parallelismof contacts;see paragraphs5.7.1and 5.7.4 (d)

Pitch,flankangles,nwcimnnerrorin indicatedmasum-mnt in the micrmter headshallnot exceed0.0002inch(0.005m-n)

Pitch,flankangles,widthof flatat crest,heightoftti. Maximnlemor inindicatedmamremnt in themicrcmter head shallnoteXCeed0.0002inch (0.005m)

SEITIBG GAGESANDsmNDmDs

SolidW settingring for HI orWI’= (g) (i)

Plain Z tolerancering gage forbasicmjor diam-eter or QO mjordiamter, gageblinks,directmasuremnt

Plainz tolerarlceringgage forbasicminor diam-~t=t 9a9eblocks, direct=asurenmt

SolidW threadsettingring gageforbasicpitchiiamter, mas-~nt merrims (g)

SolidW threadsettingring gageforksic pitchiiameter(g)

--

- page 25 for footnotes.

22.-


FEIM7m-H28/20B10 March 1994

TABLE XX*2 s’mmm)smx~~. INDKXI?INGGAGES, Z NLERAKE PLAIN m

PRaXm THREAIE (SEE

P~H 5 89 .11 - (Continued)I

THREAD-AND=- ~

(RR?: ASME B1.3M-1992TABLE2)

8.

9.

10.

14•

15.

16.

17•

ThreadmeasuringMl w/suitablemasuring mwls

@tical caparatoror toolmkers micr-scopew/suitablefixturingand castreplica

Profiletracingequipnmt w/suitablef!Xturing

Surfacemasuringequipnt

Roundness/Radialvariationmasure-mnt equipnt

.Mnear IHw.ringmchine with re-quiredaccessories

Coordinatemasur-ing machinewith re-qutiedaccessories

FUR GAGESANDMEASURINGEQuIPMEm(a) (b)

Flatnessand pallelism ofinternalanvils,screwcalibration,masuringforce;se paragraphs5.7.1and 5.7.4

Micr-ter stage,m@fi-cation,radiuschart,pr-tractorhead;see paragraphs5.7.1and 5.7.4 (C)

Use mnufacturer’sinstruc-tionsto checkout stylustraverseand electronicamplification

Use manufacturer’sinstruc-tionsfor calibrationprmedures

Use mnufacturer’sinstruc-tionsfor calibrationprocedures

I

page 25 for footnotes.

Use manufacturer’sinstruc-tions for calibrationprocedures

Use manufacturer’sinstruc-tionsfor calibrationprocedures

Sm’rm GAGESANDsmANDNm

Gage blocks,calibrated“-tsize”balls

Gage blocks,pluggages,sine bar,stagemicr-ter

Specialangleblock suppliedwith instrmmt

Visual,tactileand precisiontracertyperoughnessstand-

Precisionglasssphere,roundnessmagnificationstandard,gageblocks

Asre@mdinmnufactumr’sinstructions

Asm@redinmanufacturer’sinstructions

I LAIIWW w Lam-u u

23


mBSTD-H28/20B10 March 1994

TAELE XX.3 CALIBRATIONREOUIREMENK ~R THREADAND PLAINSm m GAGES[SEEPARAGRAPH5.8.21

SETITNG GAGE CALIBMTION REQUXREMENE

03, K), ma W threadsetting Lead, flankangles,majordiamter,plug gage,truncatedand full taper,straightnessand roundnessoffOnn major and pitchcylinders,clearance

at root,coaxialityof majorcylinderwith pitchcylinder.

(33, HI, Ma solidW thread Lead, flankangles,minordiamter,settingring gage pitchdiamter (e),ta~r, straight-

ness and roundnessof minorand pitch, cylinders,clearanceat root,coaxi-

alityof minorcylinderwith pitchcylinder

Plain Z toleranceplug and ring ~ Diamter, taper,straightness,gages roundness

—


24


FED-STD-H28/20B10 March 1994

Footnotesto TablesXX.1, XX.2 and XX.3

(a)

(b)

(c)

(d)

(e)

(f)

(9)

(h)

(i)

(j)

(k)

Use ap@icable X, W or Z gage tolerance.

Taper,straightnessincludingbllnmth barrelshapeand hour glassshape,roundnessshallbe withinthe X, W or Z tolerancedependingon theelemnt masured. In otherwords,if these featuresare masurd atpitchcylinder,the tolerancefor pitchdiamter applies.

Use manufacturer’sreccmmded proceduresfor his gage for checkingthethreadfeaturesand alignmnt of indicatinggagec~nents.

New rollsand segnentsshallbe withinX tolerance. Worn rollsorsegmnts shallbe replacedwhen a singlethreadelemnt wars outsideofX tolerance.

Pitchdiamter of an internalthread,masured by best size ballcontacts,will k 0.0001to 0.0002inch (0.0025to 0.005m) largerthanthe pitchdiamter, gaged indirectly~ a snug fittingmasterthreadplug gage or lockedsegmnts of an indicatinggagewhichweremasured by best sizewire mthod. This differenceis due to thefunctionalsize of the resterthreadplug gage or ldced segmnts whichunavoidablyhave smll variationsin lead,flankangle,taper androundness.

Pitchdiamter is usuallytransferredfrm threadsettinggage.

When the gage is set by adjust.mntbasedupon actualmasumd pitchdiamter of the settingmaster,the mastershallnet all Wtolerancesexceptfor pitchdiamter, whichmy have a toleranceincreasedto X.

For externalthreadpitchdiamter size,adjustablethreadsnapgagesand indicatingthreadgagesmy be set frm one or mre of thefollwing: threadedsettingplug gage, Z toleranceplaincylindricalpluggage,gage blm~, directmasurment and speciallydesignd transferst*ds ● Gagingelemnts mst be qualifiedfor settingfrm theiroutsidediamters.

For internalthreadpitchdiamter size,S- typesof adjustablesmpgagesmy be set frm Z toleranceplainring gage or directmas~nt.Gagingelmvmts mst be qualifiedfor settingfrm theiroutsidediameters.

Pitchdiametersizemy be set by directmasuremnt over wires on 180°segmnts, with speciallydesignedtransferstandardsor by Z toleranceplain ring gageswhen gagingelemnts are qualifiedfor settingfrmtheiroutsidediamters.

W tolerancesettingplug gagesmy k used untila singlethreadelementwearsoutsidethe X gage tolerance.

25


FEMYIWH28/20B10 Much 1994

MILITARYIMHWSTS: CIVILAGENCYCOORDINATINGM71VITY:

custodians : m-7FxE

Army-AR PREP- AcrnTrY:Navy - ASh Force- 99 DLA - IS

ReviewActivities: (DoDProj~ THDS-0097)

Amy- AT, AV, ER, ME, ~Navy - EC, 0S, YD& Force- 82

26


———..— ———

STANDARDIZATION DOCIJMENT IMPROVEMENT PROPOSAL

INSTRUCTIONS

1 The preparing activity must <ornplete bl~k$ 1, 2, 3, and 8. In bJock 1, both the document number and Tevlslor

lettershould be given

2. The submitter of this form must complete block$ 4,5,6,and 7

3. The preparing activity must provide a reply within 30daY$from receipt of the form.

NOTE: This form may not be used to request cop~es of documents, nor to request waivers, or clarificationrequirements on current contracts, comments submitted on this form do not constitute of imply authorizationwaive any portion of the referenced document(s) or to amend contractual requirements

ofto

1 RECQMMEND A CHANGE: ‘ ‘;;: E;;:y;; , ~ ~B2.DOCUMENT DATE (Y YMMDD)

940310

3. DOCUMENT TITLE

INSPECTIONMETHODSFOR ACCEPTABILITYOF . . . SCREW THREADS

OF-CHANGE (/dentlfy paragraph number and /nc/ude proposed rewrite, if possible. Aftach efira sheets as needed.)4. NATURE

5. REASON FOR RECOMMENDATION

---- — I

1- _L J &k >> {lrlckie Z(p Code) d IWEW@NE [%lude Area Code) 7. DA7f SU8M1TTED

{1) Comm8f@ (YY&tA4f2DJ

I{2} AIJToVON

Of apptiatij

~ 8 PRIPARING ACTIVITY

Ia NAME

.— —— ..—. .——.,“\ I 1, I ,1(1( C8/(/,~ ,:11) I ,1, f,

I /J’]’q’~ : 1)]>( ”-1’]”!

b Telephone (klu~e Area Code)/1) (Ornrner(lal [J) AU~OvOfy


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