uscar-10revision2v003

TESTFOREVALUATINGTHETORQUE-TENSIONRELATIONSHIPOFBOTHEXTERNALANDINTERNALMETRICTHREADEDFASTENERSSAE/USCAR-10Revision2April2007ISBN:978-0-7680-1947-6__________________________________________________________________________________________________________________________________________Theresearchdata,analysis,conclusion,opinionsandothercontentsofthisdocumentaresolelytheproductoftheauthors.NeithertheSocietyofAutomotiveEngineers,Inc.(SAE)northeUnitedStatesCouncilforAutomotiveResearch(USCAR)certifiesthecomplianceofanyproductswiththerequirementsofnormakesanyrepresentationsastotheaccuracyofthecontentsofthisdocumentnortoitsapplicabilityforpurpose.Itisthesoleresponsibilityoftheuserofthisdocumenttodeterminewhetherornotitisapplicablefortheirpurposes.Copyright©2007USCARPrintedinU.S.A.Allrightsreserved.QUESTIONSREGARDINGTHISDOCUMENT:(248)273-2470FAX(248)273-2494TOPLACEADOCUMENTORDER:(724)776-4970FAX(724)776-0790SAE/USCAR-10REVISION2Issued1998-12Revised2007-04TESTFOREVALUATINGTHETORQUE-TENSIONRELATIONSHIPOFBOTHEXTERNALANDINTERNALMETRICTHREADEDFASTENERSSUMMARYOFCONTENTS1.SCOPE.............................................................................................................................................................22.TESTMATERIALS...........................................................................................................................................23.TESTEQUIPMENT..........................................................................................................................................34.TESTPROCEDURE.........................................................................................................................................35.DATAANALYSIS.............................................................................................................................................46.REFERENCES.................................................................................................................................................47.KEYWORDS....................................................................................................................................................4SAE/USCAR-10REVISION2Revised2007-04TESTFOREVALUATINGTHETORQUE-TENSIONRELATIONSHIPOFBOTHEXTERNALANDINTERNALMETRICTHREADEDFASTENERS-2-1.SCOPE:Thisstandardprovidesatestmethodfordeterminingthetorque-tensionrelationshipofbothexternalandinternalmetricthreadedfastenersforthepurposeofmeasuringthefrictionalcharacteristicsofthethreadedfasteners.Theresultsobtainedbythistestarerelevanttothetestconditionsonlyandshouldnotbeutilizedforspecificapplications.1.1Thetestshallconsistofasingleinstallationofthesamplefastenerinatestfixtureusingaconstantspeedpowertool.Thetestsampleshallbeassembledontoanappropriatematingtestpart(i.e.,anutwillbetestedbybeingdrivenontoatestscrew).Thetestsampleshallbedrivenagainstatestwasherasthebearingsurface.2.TESTMATERIALS:2.1TestScrewsforNutTesting:Testscrewsshallcorrespondinsizetothenuttobetested.ThescrewsshallconformtothegeneralrequirementsofASME18.2.3.1M(ISO4014)andheattreatedinaccordancewithASTMF568(ISO898-1),PropertyClass10.9.DecarburizationofthescrewthreadsshallbewithinthelimitsdefinedinSAEJ121M(ISO898-1),Class3/4H.Screwsshallbezincelectroplatedtoathicknessof3to5µmwhenmeasuredonthehexagonflats.ThreadsshallconformtoASMEB1.13M(ISO965/1),Class6htolerancesandconfirmedbyASMEB1.3M,System22,afterplating.ThreadsonallscrewsM24andsmallershallberolled.Thethreadsurfaceshallbefreeofburrsorothercontaminationthatmightaffectanaccuratedeterminationoftheperformanceofthenut.Thescrewlengthshallbesuchthataminimumoftwofullformthreadsprotrudethroughthenutwhenthenutisfullyseatedagainstthetestwasher.Thethreadlengthshallbesuchthataminimumoftwofullformthreadsareexposedwithinthegriplengthafterthenutisfullyseated.RefertoFigure1.Anewtestscrewshallbeusedfortestingeachnut.2.2TestNutsforScrewTesting:Testnutsshallcorrespondinsizetothescrewtobetested.ThenutsshallconformtothegeneralrequirementsofASMEB18.2.4.1M(ISO4032)andheattreatedinaccordancewithASTMA563M(ISO898-2),PropertyClass10.Nutsshallbezincelectroplatedtoathicknessof3to5µmwhenmeasuredonthehexagonflats.Thethreadsurfaceshallbecompletelyanduniformlyzincelectroplated.ThreadsshallconformtoASMEB1.13M(ISO965/1),Class6HtolerancesandconfirmedbyASMEB1.3M,System22,afterplating.Thethreadsurfaceshallbefreeofburrsorothercontaminationthatmightaffectanaccuratedeterminationoftheperformanceofthebolt.Anewtestnutshallbeusedfortestingeachscrew.2.3TestWasher:Testwashersshallconformtothedimensional,metallurgical,andmechanicalandfinishrequirementsgiveninTable1.Testwashersshallbeplainandlightlyoiledforprotection,butdegreasedpriortotesting.SAE/USCAR-10REVISION2Revised2007-04TESTFOREVALUATINGTHETORQUE-TENSIONRELATIONSHIPOFBOTHEXTERNALANDINTERNALMETRICTHREADEDFASTENERS-3-Fortestingofnutandwasherorscrewandwasherassemblies,thetestwashermaybeunhardenedmildsteel.Thereshallbenorelativemotionbetweentheassembledwasherandthetestwasher.Teststripsmaybeusedinplaceofatestwasherprovidedtheaboverequirementsaresatisfied.Anewtestwashershallbeusedforeachtestsample.3.TESTEQUIPMENT:3.1TorqueMeasuringDevice:Thetorquemeasuringdeviceshallbeastraingagetorquetransducer.Theaccuracyofthetorquemeasurementshallbewithin2.0%ofthetorquebeingreadatthedrivespeedsutilized.3.2LoadMeasuringDevice:Theloadmeasuringdeviceshallbeatensiontestfixturewithadynamicloadcellthathasbeenspecificallydesignedtomeasurefastenertensionstrain.Theaccuracyofloadmeasurementshallbewithin2.0%oftheloadbeingreadatthedrivespeedsutilized.3.3DataCollectionDevice:Thedatacollectiondeviceshallhavethecapabilitytosimultaneouslyrecordtorqueandtension.Thesamplingrateandfrequencyresponseoftherecordingsystemshallbesuchthat,atthetestspeeds(RPM)specifiedinSection3.4,themeasurementsoftorqueandloadshallmeettheaccuraciesspecifiedinSection3.1and3.2.3.4DriveTool:Thedrivetoolshallbeafixturedconstantspeedpowertool.Thetoolshallbecapableofproducingtorquesgreaterthantherequirementsofthepartstobetestedandshallmaintainacontinuousspeedof10to40RPMforthedurationofthetest.ForpartsgreaterthanM16,thespeedshallbe5to15RPM.Socketsshallnotbeallowedtocontactthetestwasherduringtherundown.4.TESTPROCEDURE:4.1Looselyassemblebyhandthetestsample,theappropriatematingtestpartandthetestwasherintothetestfixture.Thepartsaretobeinstalledsuchthatthetestsamplecanbedrivenbythedrivetoolanditsbearingsurfacerotatesagainstthetestwasher.Thetestwashershallbepreventedfromturningduringtherundown.Adjustthegriplengthofthetestfixturesuchthatwhenthepartsarefullyseated,thescrewprotrudesaminimumoftwofullformthreadsthroughthenut.AsuitablefixtureisshowninFigure1.4.2Setthepowertooltoshutoffatatorqueapproximately2.0%greaterthanthemaximumtorqueatclampvalue(typicallytheclampvalueis75%oftheproofloadfortheexternallythreadedfastener)allowedforthetestsample.4.2.1Alternativelythetoolmaybesettoshutoffonatensionvalueapproximately1.0%greaterthantheclampvalue.Thismethodispreferredifthistestisperformedinconjunctionwithprevailingtorquetesting.SAE/USCAR-10REVISION2Revised2007-04TESTFOREVALUATINGTHETORQUE-TENSIONRELATIONSHIPOFBOTHEXTERNALANDINTERNALMETRICTHREADEDFASTENERS-4-Tightenthejointbydrivingthetestsamplewiththepowertoolattheappropriatespeedforthesamplebeingtested.Bothtorqueandtensionaretoberecordedsimultaneouslyduringtherundown.5.DATAANALYSIS:5.1SampleSize:Thesamplesizeshallbeasspecifiedorasagreedtobetweenmanufacturerandpurchaser.5.2SurrogateTestSamples:Incaseswhereactualpartscannotbetestedinthismannerorforcertificationofaplating/finishingprocess,asurrogatepartmaybeused.Therequirementsforthesurrogatepartarethesameasdefinedfortestscrewsinsection2.1ortestnutsinsection2.2exceptthatthespecifiedplating/finishshallreplacethezincelectroplate.5.3Results:Thetorquerequiredtoachievethespecifiedclamploadintheloadcellshallbebetweenthevaluesspecifiedforthetestsample.Typicallytheselimitshavebeenspecifiedasabsolutemaximumsandminimums.Ifstatisticallimitsaretobeapplied,theyshallbedefinedinthespecificationsforthetestsample.6.REFERENCES:ASMEB18.2.3.1M(ISO4014)ASMEB18.2.4.1M(ISO4032)ASMEB1.13M(ISO965/1)ASMEB1.3MASTMA563M(ISO898-2)ASTMF568(ISO898-1)SAEJ121M(ISO898-1)7.KEYWORDS:Torque,Tension,Clamp,LoadSAE/USCAR-10REVISION2Revised2007-04TESTFOREVALUATINGTHETORQUE-TENSIONRELATIONSHIPOFBOTHEXTERNALANDINTERNALMETRICTHREADEDFASTENERS-5-Table1–TestWashersNominalDiameterOfTestBoltHoleDiameter,d1MaximumMinimumWidth,wMinimumThickness,sMinimumM5M6M8M105.306.408.5010.505.056.158.2510.2511.916.719.722.71.31.81.81.8M12M14M1612.5014.5016.5012.2514.2516.2529.332.436.12.92.92.9M20M2421.0025.0020.7524.7542.655.53.93.9NOTES:1.Alldimensionsareinmillimeters.2.MaterialshallbecarbonsteelwithachemicalcompositionofC0.48to0.60percent,Mn0.60to1.50percent,P0.35percentmax.,andS0.045percentmax.,through-hardened,quenchedandtempered,withasurfacehardnessofRockwell15N85to88(HV2.5=500to600)andacorehardnessofRockwellA73min.(HV30=450min.).3.Thewasherfacesshallbeflatandparallelwithinatolerancezoneof4percentofthespecifiedminimumthickness.Washersshallbefreefromburrsandsharpedges.4.Washersshallbeplainandlightlyoiledforprotection,butdegreasedpriortotesting.SAE/USCAR-10REVISION2Revised2007-04TESTFOREVALUATINGTHETORQUE-TENSIONRELATIONSHIPOFBOTHEXTERNALANDINTERNALMETRICTHREADEDFASTENERS-6-Figure1–PlanofaTestFixture–ClampLoadMeasuringDeviceCLAMPLOADMEASURINGDEVICE<</ASCII85EncodePagesfalse/AllowTransparencyfalse/AutoPositionEPSFilestrue/AutoRotatePages/All/Binding/Left/CalGrayProfile(GrayGamma2.2)/CalRGBProfile(sRGBIEC61966-2.1)/CalCMYKProfile(U.S.WebCoated\050SWOP\051v2)/sRGBProfile(sRGBIEC61966-2.1)/CannotEmbedFontPolicy/Warning/CompatibilityLevel1.3/CompressObjects/Tags/CompressPagestrue/ConvertImagesToIndexedtrue/PassThroughJPEGImagestrue/CreateJDFFilefalse/CreateJobTickettrue/DefaultRenderingIntent/Default/DetectBlendstrue/DetectCurves0.1000/ColorConversionStrategy/LeaveColorUnchanged/DoThumbnailsfalse/EmbedAllFontstrue/EmbedOpenTypefalse/ParseICCProfilesInCommentstrue/EmbedJobOptionstrue/DSCReportingLevel0/EmitDSCWarningsfalse/EndPage-1/ImageMemory1048576/LockDistille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