IFI-524-2002-非金属预置扭矩螺钉防松性能测试程序-公制系列

TESTPROCEDUREFORTHEPERFORMANCEOFMETRICNONMETALLICRESISTANTELEMENTPREVAILING-TORQUESCREWSINDUSTRIALFASTENERSINSTITUTE1717EastNinthStreet,Suite1105•Cleveland,Ohio44114USAAllstandardsandspecificationsareadvisoryonly.Theirusebyanyoneisentirelyvoluntary.Reliancethereonforanypurposebyanyoneisatthesoleriskofthatpersonortheuseroftheproduct,andtheIFIisnotresponsibleforanyloss,claim,ordamagearisingtherefrom.Informulatingandapprovingstandardsandspecifications,theIFIhasnotinvestigatedandwillnotinvestigatepatentswhichmayapplytothesubjectmatter.Prospectiveusersofthestandardsandspecificationsareresponsibleforadvisingthemselvesofandprotectingthemselvesagainstanypatentinfringementliabilitywhichmayariseoutofsuchuse.©INDUSTRIALFASTENERSINSTITUTE2002PublishedandissuedbytheIndustrialFastenersInstituteofCleveland,OHIFISTANDARD®Issued:1982Revised:July2002IFI-524feature,andnotbecauseofacompressiveloaddevelopedagainsttheunderheadbearingsurfaceofthescreworatensileloaddevelopedintheshankofthescrew.1.3.2REPTscrewsaremetallicscrewstowhichhavebeenaddedanonmetallicinsertorfusednonmetallicsubstanceintheirthreadedlength.Thedesignoftheprevailing-torquefeatureshallbeinaccordancewiththepracticeofthemanufacturer.Dependingupontheamountoffrictionpresentbecauseofsurfacefinishandlubri-cants,thedimensionalcharacteristicsofthenonmetallicelementmayvarytoachievetheperformancerequire-mentsstatedinTable1.1.3.3Forpurposesofthisstandard,lotmeansaquantityoffastenersofonepartnumberfabricatedbythesameproductionprocessfromthesamecoilorheatnumberofmetalasprovidedbythefastenermanufacturerandsubmittedforinspectionandtest-ingatonetime.2.0PropertyClasses.2.1PropertyClasses.ThisstandardcoversonlysteelREPTscrewsproducedtomeettheme-chanicalstrengthrequirementsofoneoffourbasicpropertyclasses,8.8,9.8,10.9and12.9asspecifiedinASTMF568.ThestandardsizesofREPTscrewsforeachofthefourpropertyclassesaregiveninTable1.3.0ReferencedStandards.Allstandardsarelatestissueunlessotherwiseagreedbetweenmanufacturerandpurchaser.3.1ASMEStandards.ThesemaybeobtainedfromASME;ThreeParkAvenue;NewYork,NY10016-5990.B1.3MScrewThreadGagingSystemsforDimensionalAcceptability–InchandMetricScrewThreads,(UN,UNR,UNJ,MandMJ)1.0Scope.1.1ThisstandardestablishesaconformancetestprocedurefortheperformanceofmetricNonmetallicResistantElementTypePrevailing-TorqueScrews(hereinaftercalledREPTscrew),innominalthreaddiametersM1.6thruM36.Theprevailing-torquevaluesgiveninthisstandardareconformancerequirementsoftestcon-ditionsdescribedintheperformancetestprocedure(5.1).Iftheconditionsoftheactualserviceapplica-tiondifferfromthoseof5.1(e.g.,internallythreadedholeinadifferentmaterial,lengthofthreadengage-ment,classofinternalthreadtolerance,speedofdriving,differentplatingorcoatingonscrewormat-ingpart),theprevailing-torquevaluesmaydiffer.SuchvaluescanonlybedeterminedthroughtestingtheREPTscrewinitsspecificapplication.Thisstandardisnotconcernedwithdimen-sionalfeaturessuchasheadstyles,orwithperfor-mancecapabilitiessuchasstrengthproperties,cor-rosionresistance,sealing,suitabilityforuseinhighorlowtemperatures,and/orconsistencyoftorque-to-tensionrelationshipsduringassembly.Suchfea-turesandpropertiesarecoveredinotherstandardsandspecificationsandmustbereferencedwhenspecifyingaREPTscrewtoassurethatalloftheserviceconditionsoftheparticularengineeringap-plicationareproperlymet.(Note:Theapplicationofsomenonmetallicelementsrequiresheatingofanisolatedareainthescrewthreadtoapproximately316ºCwhichmayhaveanadverseeffectonthemechanicalproper-tiesofsomeproducts.)1.2WhiletherequirementsofthisstandardapplytoREPTscrews,itisnottheintenttoprecludealternatetypesofscrewswhichtotallysatisfytherequirementsofthisstandard.1.3Definitions.1.3.1Aprevailing-torqueREPTscrewisanexter-nallythreadedfastenerwhichisfrictionallyresistanttorotationduetoaself-containedprevailing-torquePage1of5TESTPROCEDUREFORTHEPERFORMANCEOFMETRICNONMETALLICRESISTANTELEMENTPREVAILING-TORQUESCREWSINDUSTRIALFASTENERSINSTITUTE1717EastNinthStreet,Suite1105Cleveland,Ohio44114USAAllstandardsandspecificationsareadvisoryonly.Theirusebyanyoneisentirelyvoluntary.Reliancethereonforanypurposebyanyoneisatthesoleriskofthatpersonortheuseroftheproduct,andtheIFIisnotresponsibleforanyloss,claim,ordamagearisingtherefrom.Informulatingandapprovingstandardsandspecifications,theIFIhasnotinvestigatedandwillnotinvestigatepatentswhichmayapplytothesubjectmatter.Prospectiveusersofthestandardsandspecificationsareresponsibleforadvisingthemselvesofandprotectingthemselvesagainstanypatentinfringementliabilitywhichmayariseoutofsuchuse.©INDUSTRIALFASTENERSINSTITUTE2002PublishedandissuedbytheIndustrialFastenersInstituteofCleveland,OHIFISTANDARD®Issued:1982Revised:July2002IFI-524B1.13MMetricScrewThreads–MProfile3.2ASTMStandards.ThesemaybeobtainedfromASTM;100BarrHarborDrive;WestConshohocken,PA19428-2959.ASTMF568MCarbonandAlloySteelExter-nallyThreadedMetricFasteners4.0Requirements.4.1Finish.REPTscrewsshallbefurnishedplainorwithaprotectivecoatingasspecifiedbythepurchaser.Attheoptionofthemanufacturer,screwsmaybeprovidedwit