ISO898-1:2009specifiesthemechanicalpropertiesofcarbonsteelandalloysteelfastenerswithcoarseandfinepitchthreads,includingbolts,screws,andstuds.Thestandarddefinespropertyclassesbasedontensilestrength,yieldstrength,andelongation,ensuringconsistentperformanceforindustrialapplications.AdditionalDescription:Thestandardalsocoversrequirementsforhardness,impactresistance,andsurfacediscontinuitiestoensuredurabilityandreliabilityundervariousloadingconditions.Itappliestofastenerswithnominaldiametersrangingfrom1.6mmuptoandincluding100mm.Theperformanceclassesaredesignatedbynumberssuchas4.6,8.8,10.9,and12.9,wherethefirstnumberindicates1/100oftheminimumtensilestrengthinMPa,andthesecondnumberrepresentstheyieldstrengthratioasapercentageofthetensilestrength.Propermaterialselection,heattreatment,andtestingmethodsarespecifiedtomeettherequiredmechanicalpropertiesforeachperformanceclass.
