Designation:A194/A194M−17EndorsedbyManufacturersStandardizationSocietyoftheValveandFittingsIndustryUsedinUSNRC-RDTStandardsStandardSpecificationforCarbonSteel,AlloySteel,andStainlessSteelNutsforBoltsforHighPressureorHighTemperatureService,orBoth1ThisstandardisissuedunderthefixeddesignationA194/A194M;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheU.S.DepartmentofDefense.1.Scope*1.1Thisspecification2coversavarietyofcarbon,alloy,andmartensiticstainlesssteelnutsinthesizerange1⁄4through4in.andmetricM6throughM100nominal.Italsocoversausteniticstainlesssteelnutsinthesizerange1⁄4in.andM6nominalandabove.Thesenutsareintendedforhigh-pressureorhigh-temperatureservice,orboth.Gradesubstitutionswithoutthepurchaser’spermissionarenotallowed.1.2Barsfromwhichthenutsaremadeshallbehot-wrought.Thematerialmaybefurtherprocessedbycenterlessgrindingorbycolddrawing.Austeniticstainlesssteelmaybesolutionannealedorannealedandstrain-hardened.Whenannealedandstrainhardenedausteniticstainlesssteelisorderedinaccor-dancewithSupplementaryRequirementS1,thepurchasershouldtakespecialcaretoensurethat8.2.2,SupplementaryRequirementS1,andAppendixX1arethoroughlyunderstood.1.3Supplementaryrequirementsofanoptionalnatureareprovided.Theseshallapplyonlywhenspecifiedintheinquiry,contract,andorder.1.4Thisspecificationisexpressedinbothinch-poundunitsandinSIunits.However,unlesstheorderspecifiestheapplicable“M”specificationdesignation(SIunits),themate-rialshallbefurnishedtoinch-poundunits.1.5Thevaluesstatedineitherinch-poundunitsorSIunitsaretoberegardedseparatelyasstandard.Thevaluesstatedineachsystemmaynotbeexactequivalents;therefore,eachsystemshallbeusedindependentlyoftheother.Combiningvaluesfromthetwosystemsmayresultinnon-conformancewiththestandard.Withinth...
