Designation:A563M−07(Reapproved2013)StandardSpecificationforCarbonandAlloySteelNuts(Metric)1ThisstandardisissuedunderthefixeddesignationA563M;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheU.S.DepartmentofDefense.1.Scope1.1Thisspecificationcoverschemicalandmechanicalre-quirementsforeightpropertyclassesofhexandhex-flangecarbonandalloysteelnutsforgeneralstructuralandmechani-calusesonbolts,studs,andotherexternallythreadedparts.NOTE1—Throughoutthisspecification,thetermclassmeanspropertyclass.NOTE2—Requirementsforthefourclasses5,9,10,and12areessentiallyidenticalwithrequirementsgivenfortheseclassesinISO898/II.RequirementsforClasses8Sand10SareessentiallyidenticalwithrequirementsinanISO4775HexagonNutsforHigh-StrengthStructuralBoltingwithLargeWidthAcrossFlats,ProductGradeB,PropertyClasses8and10.Classes8S3and10S3arenotrecognizedinISOstandards.1.2Classes8S3and10S3nutshaveatmosphericcorrosionresistanceandweatheringcharacteristicscomparabletothoseofthesteelscoveredinSpecificationA588/A588M.Theatmosphericcorrosionresistanceofthesesteelsissubstantiallybetterthanthatofcarbonsteelwithorwithoutcopperaddition(see6.2).Whenproperlyexposedtotheatmosphere,thesesteelscanbeusedbare(uncoated)formanyapplications.1.3Thenutsizerangeforwhicheachclassisapplicableisgiveninthetableonmechanicalrequirements.1.4AppendixX1givesguidancetoassistdesignersandpurchasersintheselectionofasuitableclass.1.5AppendixX2givesdataonthepropertiesofslottedhexnutsandhexjamnuts.1.6ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.NOTE3—ThisspecificationisthemetriccompanionofSpecificationA563.2.ReferencedDocuments2.1ASTMStandards:2A153/A153MSpecificationforZincCoating(Hot-Dip)onIronandSteelHardwareA325MSpecific...
