BS EN 20898-2 1994 紧固件的机械性能.第2部分有规定检验载荷值的螺母.粗牙螺纹

BRITISHSTANDARDBSEN20898-2:1994ISO898-2:1992Mechanicalpropertiesoffasteners—Part2:Nutswithspecifiedproofloadvalues—CoarsethreadTheEuropeanStandardEN20898-2:1993hasthestatusofaBritishStandardUDC621.882.3BSEN20898-2:1994ThisBritishStandard,havingbeenpreparedunderthedirectionoftheGeneralMechanicalEngineeringStandardsPolicyCommittee,waspublishedundertheauthorityoftheStandardsBoardandcomesintoeffecton15June1994©BSI01-1999FirstpublishedApril1992SecondeditionJune1994ThefollowingBSIreferencesrelatetotheworkonthisstandard:CommitteereferenceGME/9Draftforcomment90/79942DCISBN0580231372CooperatingorganizationsTheEuropeanCommitteeforStandardization(CEN),underwhosesupervisionthisEuropeanStandardwasprepared,comprisesthenationalstandardsorganizationsofthefollowingcountries:AustriaOesterreichischesNormungsinstitutBelgiumInstitutbelgedenormalisationDenmarkDanskStandardiseringsraadFinlandSuomenStandardisoimisliito,r.y.FranceAssociationfrançaisedenormalisationGermanyDeutschesInstitutfürNormunge.V.GreeceHellenicOrganizationforStandardizationIcelandTechnologicalInstituteofIcelandIrelandNationalStandardsAuthorityofIrelandItalyEnteNazionaleItalianodiUnificazioneLuxembourgInspectionduTravailetdesMinesNetherlandsNederlandsNormalisatie-instituutNorwayNorgesStandardiseringsforbundPortugalInstitutoPortuguèsdaQualidadeSpainAsociaciónEspañoladeNormalizaciónyCertificaciónSwedenStandardiseringskommissioneniSverigeSwitzerlandAssociationsuissedenormalisationUnitedKingdomBritishStandardsInstitutionAmendmentsissuedsincepublicationAmd.No.DateCommentsBSEN20898-2:1994©BSI01-1999iContentsPageCooperatingorganizationsInsidefrontcoverNationalforewordiiForeword21Scope32Normativereferences33Designationsystem44Materials45Mechanicalproperties46Proofloadvalues87Failureloadsfornutswithnominalheight$0.5Dbut0.8D88Testmethods89Marking9AnnexA(informative)Loadabilityofboltedconnections12AnnexB(informative)Bibliography16AnnexZA(normative)NormativereferencestointernationalpublicationswiththeirrelevantEuropeanpublications17NationalannexNA(informative)CommitteesresponsibleInsidebackcoverNationalannexNB(informative)Cross-referencesInsidebackcoverFigure1—Axialtensiletest8Figure2—Axialcompressivetest9Figure3—Examplesofmarkingwithdesignationsymbol9Figure4—Examplesofmarkingwithcodesymbol(clock-facesystem)9Figure5—Left-handthreadmarking11Figure6—Alternativeleft-handthreadmarking11Table1—Reductioninthreadstrength3Table2—Designationsystemfornutswithnominalheights$0.8D4Table3—Designationsystemandstressesunderproofloadfornutswithnominalheights$0.5Dbut0.8D4Table4—Limitsofchemicalcomposition4Table5—Mechanicalproperties5Table6—Proofloadvalues—Coarsethread7Table7—Minimumboltstresswhenstrippingoccurs8Table8—Markingsymbolsfornutswithpropertyclassesinaccordancewith3.110Table9—Markingfornutswithpropertyclassesinaccordancewith3.210TableA.1—Propertyclassesforboltsandscrews15TableA.2—Effectivemaximumhardnesswithinthethreadengagementpartofthebolt15TableA.3—Heightsofhexagonnuts15BSEN20898-2:1994ii©BSI01-1999NationalforewordThisBritishStandardhasbeenpreparedunderthedirectionoftheGeneralMechanicalEngineeringStandardsPolicyCommitteeandistheEnglishlanguageversionofEN20898-2:1993Mechanicalpropertiesoffasteners—Part2:Nutswithspecifiedproofloadvalues—Coarsethread,publishedbytheEuropeanCommitteeforElectrotechnicalStandardization(CEN).ItsupersedesBSEN20898-2:1992whichiswithdrawn.EN20898-2:1993wasproducedasaresultofinternationaldiscussioninwhichtheUKtookanactivepart.ItisoneofaseriesofstandardsthatareunderpreparationbasedonISO898.ThisPartisidenticalwithISO898-2:1992publishedbytheInternationalOrganizationforStandardization(ISO).ABritishStandarddoesnotpurporttoincludeallthenecessaryprovisionsofacontract.UsersofBritishStandardsareresponsiblefortheircorrectapplication.CompliancewithaBritishStandarddoesnotofitselfconferimmunityfromlegalobligations.SummaryofpagesThisdocumentcomprisesafrontcover,aninsidefrontcover,pagesiandii,theENtitlepage,pages2to18,aninsidebackcoverandabackcover.Thisstandardhasbeenupdated(seecopyrightdate)andmayhavehadamendmentsincorporated.Thiswillbeindicatedintheamendmenttableontheinsidefrontcover.EUROPEANSTANDARDNORMEEUROPÉENNEEUROPÄISCHENORMEN20898-2December1993UDC621.882.3SupersedesEN20898-2:1991Descriptors:Fasteners,nuts(fasteners),coarsethreads,specifications,mechanicalproperties,tests,designation,markingEnglishversionMechanicalpropertiesoffasteners—Part2:Nutswithspecifiedproofloadvalues—Coarsethread(ISO898-2:1992)Caractéristiquesmécaniquesdesélémentsdefixation—Partie2:Ecrousavecchargesd’épreuvespécifiées—Filetageàpasgros(ISO898-2:1992)MechanischeEigenschaftenvonVerbindungselementen—Teil2:MutternmitfestgelegtenPrüfkräften—Regelgewinde(ISO898-2:1992)ThisEuropeanStandardwasapprovedbyCENon1993-12-16.CENmembersareboundtocomplywiththeCEN/CENELECInternalRegulationswhichstipulatetheconditionsforgivingthisEuropeanStandardthestatusofanationalstandardwithoutanyalteration.Up-to-datelistsandbibliographicalreferencesconcerningsuchnationalstandardsmaybeobtainedonapplicationtotheCentralSecre