1、EuropeanstandardNormeeuropeenneEuropaischenormICS21.060.20ENISO7719June2025SupersedesENISO7719:2012,ENISO7719:2012/AC:2013EnglishVersionFasteners-Prevailingtorquehexagonnuts-RegularnutsallmetalISO7719:2025Fixations-Ecroushexagonauxautofreines-Ecrousnormaux(toutmetal)(ISO7719:2025)Verbindungselemente
2、SechskantmutternmitKlemmteil-NormalhoheMuttern(Ganzmetallmuttern)(ISO7719:2025)ThisEuropeanStandardwasapprovedbyCENon16June2025.CENmembersareboundtocomplywiththeCEN/CENELECInternalRegulationswhichstipulatetheconditionsforgivingthisEuropeanStandardthestatusofanationalstandardwithoutanyalteration.Up-
3、to-datelistsandbibliographicalreferencesconcerningsuchnationalstandardsmaybeobtainedonapplicationtotheCEN-CENELECManagementCentreortoanyCENmember.ThisEuropeanStandardexistsinthreeofficialversions(English,French,German).AversioninanyotherlanguagemadebytranslationundertheresponsibilityofaCENmemberinto
4、itsownlanguageandnotifiedtotheCEN-CENELECManagementCentrehasthesamestatusastheofficialversions.CENmembersarethenationalstandardsbodiesofAustria,Belgium,Bulgaria,Croatia,Cyprus,CzechRepublic,Denmark,Estonia,Finland,France,Germany,Greece,Hungary,Iceland,Ireland,Italy,Latvia,Lithuania,Luxembourg,Malta,
5、Netherlands,Norway,Poland,Portugal,RepublicofNorthMacedonia,Romania,Serbia,Slovakia,Slovenia,Spain,Sweden,Switzerland,TiirkiyeandUnitedKingdom.要EUROPEANCOMMITTEEFORSTANDARDIZATIONCOMITEEUROPEENDENORMALISATIONEuropaischeskomiteefurnormungCEN-CENELECManagementCentre:RuedelaScience23,B-1040Brussels2025
6、CENAllrightsofexploitationinanyformandbyanymeansreservedRef.No.ENISO7719:2025EworldwideforCENnationalMembers.ContentsPageEuropeanforeword3EuropeanforewordThisdocument(ENISO7719:2025)hasbeenpreparedbyTechnicalCommitteeISO/TC2FastenersincollaborationwithTechnicalCommitteeCEN/TC185Fasteners“thesecretar
7、iatofwhichisheldbyBSLThisEuropeanStandardshallbegiventhestatusofanationalstandard,eitherbypublicationofanidenticaltextorbyendorsement,atthelatestbyDecember2025,andconflictingnationalstandardsshallbewithdrawnatthelatestbyDecember2025.Attentionisdrawntothepossibilitythatsomeoftheelementsofthisdocument
8、maybethesubjectofpatentrights.CENshallnotbeheldresponsibleforidentifyinganyorallsuchpatentrights.ThisdocumentsupersedesENISO7719:2012,ENISO7719:2012/AC:2013.Anyfeedbackandquestionsonthisdocumentshouldbedirectedtotheusersnationalstandardsbody/nationalcommittee.Acompletelistingofthesebodiescanbefoundo
9、ntheCENwebsite.AccordingtotheCEN-CENELECInternalRegulations,thenationalstandardsorganizationsofthefollowingcountriesareboundtoimplementthisEuropeanStandard:Austria,Belgium,Bulgaria,Croatia,Cyprus,CzechRepublic,Denmark,Estonia,Finland,France,Germany,Greece,Hungary,Iceland,Ireland,Italy,Latvia,Lithuan
10、ia,Luxembourg,Malta,Netherlands,Norway,Poland,Portugal,RepublicofNorthMacedonia,Romania,Serbia,Slovakia,Slovenia,Spain,Sweden,Switzerland,TiirkiyeandtheUnitedKingdom.EndorsementnoticeThetextofISO7719:2025hasbeenapprovedbyCENasENISO7719:2025withoutanymodification.ISOInternationalStandardISO7719Fourth
11、edition2025-06ISO2025FastenersPrevailingtorquehexagonnutsRegularnuts(allmetal)FixationsEcroushexagonauxautofreinesEcrousnormaux(toutmetal)ReferencenumberISO7719:2025(en)COPYRIGHTPROTECTEDDOCUMENTISO2025Allrightsreserved.Unlessotherwisespecified,orrequiredinthecontextofitsimplementation,nopartofthisp
12、ublicationmaybereproducedorutilizedotherwiseinanyformorbyanymeans,electronicormechanical,includingphotocopying,orpostingontheinternetoranintranet,withoutpriorwrittenpermission.PermissioncanberequestedfromeitherISOattheaddressbeloworISO,smemberbodyinthecountryoftherequester.ISOcopyrightofficeCP401Ch.
13、deBlandonnet8CH-1214Vernier,GenevaPhone:+41227490111Email:copyrightiso.orgWebsite:www.iso.orgPublishedinSwitzerlandContentsPageForewordiv1 Scope12 Normativereferences13 Termsanddefinitions14 Dimensions25 RequirementsandreferenceInternationalStandards46 Markingandlabelling56.1 Markingonproduct56.2 La
14、bellingonpackage57 Designation5Bibliography6ForewordISO(theInternationalOrganizationforStandardization)isaworldwidefederationofnationalstandardsbodies(ISOmemberbodies).TheworkofpreparingInternationalStandardsisnormallycarriedoutthroughISOtechnicalcommittees.Eachmemberbodyinterestedinasubjectforwhich
15、atechnicalcommitteehasbeenestablishedhastherighttoberepresentedonthatcommittee.Internationalorganizations,governmentalandnon-governmental,inliaisonwithISO,alsotakepartinthework.ISOcollaboratescloselywiththeInternationalElectrotechnicalCommission(IEC)onallmattersofelectrotechnicalstandardization.Thep
16、roceduresusedtodevelopthisdocumentandthoseintendedforitsfurthermaintenancearedescribedintheISO/IECDirectives,Part1.Inparticular,thedifferentapprovalcriterianeededforthedifferenttypesofISOdocumentshouldbenoted.ThisdocumentwasdraftedinaccordancewiththeeditorialrulesoftheISO/IECDirectives,Part2(seeWWW.
17、iso.org/directives).ISOdrawsattentiontothepossibilitythattheimplementationofthisdocumentmayinvolvetheuseof（八）patent(三).ISOtakesnopositionconcerningtheevidence,validityorapplicabilityofanyclaimedpatentrightsinrespectthereof.Asofthedateofpublicationofthisdocument,ISOhadnotreceivednoticeof（八）patent(三)w
18、hichmayberequiredtoimplementthisdocument.HoweverlImplementersarecautionedthatthismaynotrepresentthelatestinformation,whichmaybeobtainedfromthepatentdatabaseavailableatWWW.iso.org/patents.ISOshallnotbeheldresponsibleforidentifyinganyorallsuchpatentrights.Anytradenameusedinthisdocumentisinformationgiv
19、enfortheconvenienceofusersanddoesnotconstituteanendorsement.Foranexplanationofthevoluntarynatureofstandards,themeaningofISOspecifictermsandexpressionsrelatedtoconformityassessment,aswellasinformationaboutISOsadherencetotheWorldTradeOrganization(WTO)principlesintheTechnicalBarrierstoTrade(TBT),seeWWW
20、iso.org/iso/foreword.htmLThisdocumentwaspreparedbyTechnicalCommitteeISO/TC2,Fasteners,SubcommitteeSC12,Fastenerswithmetricinternalthread,incollaborationwiththeEuropeanCommitteeforStandardization(CEN)TechnicalCommitteeCEN/TC185,Fasteners,inaccordancewiththeAgreementontechnicalcooperationbetweenISOan
21、dCEN(ViennaAgreement).Thisfourtheditioncancelsandreplacesthethirdedition(ISO7719:2012)whichhasbeentechnicallyrevised.ItalsoincorporatestheTechnicalCorrigendumISO7719:2012/Cor.l:2013.Themainchangesareasfollows: thedesignprinciplesofthesenutshavebeenclarifiedinScope(seeNote); style,relevantpropertycla
22、ssesandrelatedquenchingandtemperingconditionsforsteelnutshavebeenspecifiedinClaUSe5inaccordancewithISO898-2(seeTable3); stainlesssteelnutshavebeenaddedinaccordancewithISO3506-2; M7,M27,M33andM39havebeenadded; damax，w,minand117wminhavebeenspecifiedwithtwodecimalplaces;一dwmi11frM5hasbeenchangedfromsmi
23、n-IT16toSmin-115inordertohavealargerbearingsurfaceareaandthuslesscontactpressure;一hminforM5andM6hasbeenamendedtostyle1inaccordancewiththescopeofthisdocument,andmahasbeendecreasedaccordingly(seeTable1); specificationsformarkingandlabellinghavebeenaddedasClause6.Anyfeedbackorquestionsonthisdocumentsho
24、uldbedirectedtotheusersnationalstandardsbody.AcompletelistingofthesebodiescanbefoundatWWW.iso.org/membnrs.htmLFastenersPrevailingtorquehexagonnutsRegularnuts(allmetal)1 ScopeThisdocumentspecifiesthecharacteristicsofprevailingtorque(allmetal)hexagonregularnuts,insteelandstainlesssteel,withmetriccoars
25、epitchthreadM5toM39,andwithproductgradesAandB.NOTEThesenutsaredesignedwithanoverallheighthmin=mmin(asspecifiedinISO898-2andISO4032forstyle1)plustheprevailingtorquefeature,hmahasbeenestablishedinfunctionofhmin;therefore,thetolerance(max一min】doesnotfollowtheISOcodesystemfortolerances(ITsystem).Ifincer
26、taincasesotherspecificationsarerequested,propertyclassesandstainlesssteelgradescanbeselectedfromISO898-2orISO3506-2.2 NormativereferencesThefollowingdocumentsarereferredtointhetextinsuchawaythatsomeoralloftheircontentconstitutesrequirementsofthisdocument.Fordatedreferences,onlytheeditioncitedapplies
27、Forundatedreferences,thelatesteditionofthereferenceddocument(includinganyamendments)applies.ISO225,FastenersBolts,screws,studsandnutsSymbolsanddescriptionsOfdimensionsISO898-2,FastenersMechanicalpropertiesOffastenersmadeofcarbonsteelandalloysteelPart2:NutswithspecifiedpropertyclassesISO965-llISOgen
28、eralpurposemetricscrewthreadsTolerancesPart1:PrinciplesandbasicdataISO1891-4,FastenersVocabularyPart4:Control,inspection,delivery,acceptanceandqualityISO2320,FastenersPrevailingtorquesteelnutsFunctionalpropertiesISO3269,FastenersAcceptanceinspectionISO3506-2,FastenersMechanicalpropertiesofcorrosion-
29、resistantstainlesssteelfastenersPart2:NutswithspecifiedgradesandpropertyclassesISO4042,FastenersElectroplatedcoatingsystemsISO4759-llTolerancesforfastenersPart1:Bolts,screws,studsandnutsProductgradesA,BandCISO6157-2,FastenersSurfacediscontinuitiesPart2:NutsISO899LDesignationsystemforfastenersISO8992
30、FastenersGeneralrequirementsforbolts,screws,studsandnutsISO10683,FastenersNon-electrolyticallyappliedzincflakecoatingsystems3 TermsanddefinitionsNotermsanddefinitionsarelistedinthisdocumentISOandIECmaintainterminologydatabasesforuseinstandardizationatthefollowingaddresses: ISOOnlinebrowsingplatform
31、availableathttps:/www.iso.ovg/ObP IECElectropedia:availableathttps:WWW.electropedia.org/4DimensionsDimensionsshallbeinaccordancewithFigUre1andwithTableS1and2.SymbolsanddescriptionsofdimensionsarespecifiedinISO225.40aPrevailingtorquefeature:shapeatthediscretionofthemanufacturerwithintheoutsidehexago
32、nalshapeofthenut.bThesenutsaremanufacturedwithoutwasher-face,unlessspecificallyagreedatthetimeoftheorder.Figure1Prevailingtorque(allmetal)regularnutsTable 1 DimensionsfornutsM5toM16(productgradeA)DimensionsinmillimetresThread,DM5M6(M7)M8MlOM12(M14)M16Pa0,8111,251,51,7522Idmax.I5,756,757,758,7510,801
33、2,9615,1217,28aamin.5,006,007,008,0010,0012,0014,0016,00dwmin.7,208,889,6311,6314,6316,6319,6422,49emin.8,7911,0512,1214,3817f7720,0323,3626,75hmax.4,90b5,40b6,707,109,0011,6013,2015,20min.4,40b4,90b6,146,448,0410,3712,1014,10mwmin.3,523,924,915,156,438,309,6811,28nom.=max.8,0010,00ILoO13,0016,0018,
34、0021,0024,00min.7,789,7810,7312,7315,7317,7320,6723,67Sizesshowninbracketsarenon-preferred.aPisthepitchofthethread.bInthepreviouseditionofthisdocument,thesenutswereshownwithaminimumheightnotinaccordancewithstyle1butwithstyle2,whichwereandarealreadydealtwithinISO7042;consequentlyforM5andM6,hminisnowa
35、mendedtostyle1inthisTableinaccordancewiththescopeofthisdocument,andhmaxhasbeendecreasedaccordingly.Table 2 DimensionsfornutsM18toM39(productgradeB)DimensionsinmillimetresThread,D(M18)M20(M22)M24(M27)M30(M33M36(M39)Pa2,52,52,5333,53,544damax.19,4421,6023,7625,9229,1632,4035,6438,8842,12min.18,0020,00
36、22,0024,0027,0030,0033,0036,0039,00dwmin.24,8527,7031,3533,2538,0042,7546,5551,1155,86emin.29,5632,9537,2939,5545,2050,8555,3760,7966,44hmax.17,0019,0021,0023,0025,3026,9030,5032,5035,50min.15,1016,9018,1020,2022,5024,3027,4029,4031,80mwmin.12,0813,5214,4816,1618,0019,4421,9223,5225,44Snom.=max.27,0
37、030,0034,0036,0041,0046,0050,0055,0060,00min.26,1629,1633,0035,0040,0045,0049,0053,8058,80Sizesshowninbracketsarenon-preferred.aPisthepitchofthethread.5RequirementsandreferenceInternationalStandardsTherequirementsspecifiedintheInternationalStandardsreferencedinTabIe3shallapply.Table3Requirementsandr
38、eferenceInternationalStandardsMaterialSteelStainlesssteelGeneralrequirementsInternationalStandardISO8992ThreadToleranceclassInternationalStandard6HaISO965-1Style1PropertyclassM5PM165M16PM395b,8c,10db,8d,10dMechanicalpropertiesGradeeandM5DM24ionlla48,D4-80,D6-80propertyclassM24DM16:BInternationalStan
39、dardISO4759-1Aspr。CeSSed(nocoating)cleanandbrightElectroplatedcoatingsassped-and/orfiedinISO4042n.jfPassivatedSurfaceconditionNon-electrolyticallyapplied,.XIl,r,ianorzincflakecoatingsasspecifiedinISO10683LubricatedLuOtherfinishes,coatingsand/oradditionalrequirementsshallbeagreedbetweenthepurchaseran
40、dthesupplierSurfaceintegrityLimitsforsurfacediscontinui-A,.tiesasspecifiedinISO6157-2Asa三reedAcceptabilityAcceptanceinspectionasspecifiedinISO3269aThethreadtoleranceclass6Gmaybespecifiedforthenutstobecoatedinaccordancewiththerelevantcoatingstandard(tolerancesotherthan6Hor6Garenotapplicableduetothesp
41、ecifiedfunctionalpropertiestobeachieved).bShallnotbequenchedandtemperedinaccordancewithISO898-2(NQTnuts).cMaybequenchedandtemperedatthemanufacturersdiscretion,inaccordancewithISO898-2(NQTorQTnuts),dShallbequenchedandtemperedinaccordancewithISO898-2(QTnuts).eThemostcommonstainlesssteelgradesareA2andA
42、4;however,dependingontheapplication,itcanbenecessarytoselectothergradesinISO3506-2suitablefortheservicecorrosiveenvironment.SeealsoISO3506-6fortheselectionofsuitablestainlesssteelgrades.fToday,noInternationalStandardexistsforprevailingtorquetestmethodandfunctionalpropertiesofstainlesssteelnuts;natio
43、nalstandardsorothertechnicalspecifications,e.g.NFE25-035-2,shouldbeconsultedandagreementshouldbereachedbetweenthepurchaserandthemanufacturerbeforetheorder.gSeee.g.ISO16048.hSeee.g.ISO6157-2.6 Markingandlabelling6.1 MarkingonproductMarkingshallbe: forsteelnuts,asspecifiedinISO898-2,and forstainlessst
44、eelnuts,asspecifiedinISO3506-2.6.2 LabellingonpackageLabellingonthepackageshallbeinaccordancewithISO898-2orISO3506-2,andshallincludeatleast: thereferencetothisdocument,i.e.ISO7719, thethreadsizeD, thepropertyclassforsteelnuts, thegradeandpropertyclassforstainlesssteelnuts, thetypeofsurfacecondition(
45、finishand/orcoating), themanufacturersand/ordistributorsidentificationand/orname, themanufacturinglotnumberasspecifiedinISO1891-4,and thequantityofpiecesinthepackage.7 DesignationThedesignationrequirementsasspecifiedinISO8991shallapplywith thepropertyclassforsteelnuts,asspecifiedinISO898-2,and thegradeandpropertyclassforstainlesssteelnuts,asspecifiedinISO3506-2.Whennospecificsurfacecondition(finishand/orcoating)isspecifiedinthedesignation,steelnutsaredeliveredintheasprocessedcondit
