英制螺栓机械性能要求

英制(SAEJ429)螺栓所用材料:Grade12455.15.2788.18.2MaterialandTreatmentLowormediumcarbonsteelMediumCarboncolddrawnsteelMediumCarbonsteelquenchedandtemperedLowormediumcarbonsteelMediumCarbonalloysteelquenchedandtemperedSAE1541LowormediumcarbonsteelElement%CMin--——0.280.280.280.15Max0.550.550.550.550.300.250.550.550.550.25MnMin—————0.74———0.74PMax0.0480.0480.0480.0480.0480.0480.0400.0400.0480.048SMax0.0580.0580.130.0580.0580.0580.0450.0450.0580.058BMin—————0.0005———0.0005英制螺栓(SAEJ429)的机械性质：强度等级GradeDesignation产品Products规格NominalSizeDiaInFullSizeBolts，Screws，Studs，Sems机械性能MachineTestSpecimenOfBolts，Screws，andStudsSurfaceHardnessCoreHardnessProofLoadTensileStrengthYieldStrengthTensileStrengthElongation伸长率ReductionOfArea断面收缩Rockwell30NMaxRockwellMinMax1Bolts螺栓Screws螺钉Studs螺柱1/4thru1-1/4330006000036000600001835—B70B1002Bolts螺栓Screws螺钉Studs螺柱1/4thru3/4550007400057000740001835—B80B100Over3/4thru1-1/2330006000036000600001835—B70B1004Studs螺柱1/4thru1-1/2650001150001000001150001035—C22C325Bolts螺栓Screws螺钉Studs螺柱1/4thru18500012000092000120000143554C25C34Over1thru1-1/2740001050008100010500143550C19C305.1d此螺丝有垫片Bolts螺栓Screws螺钉Studs螺柱No.6thru5/885000120000————59.5C25C40No.6thru1/2/////////5.2Bolts螺栓Screws螺钉1/4thru18500012000092000120000143556C26C367e此螺丝热处理后辗牙Bolts螺栓Screws螺钉1/4thru1-1/210500013300115000133000123554C28C348Bolts螺栓Screws螺钉Studs螺柱1/4thru1-1/212000015000013000015000123558.6C33C39

配合的螺帽为ASTMA563中的产品：Thesevaluesaretheastheover-tappingrequiredforzinccoatednutsinSpecificationASTMA5631/4至1-1/2英寸普通产品配合的螺■为ASTMA563的B普通螺帽(hex)；1-1/2至3英寸普通产品配合的螺帽为ASTMA563的A■型螺帽(heavyhex)；1/4至3英寸镀锌产品配合的螺帽为ASTMA563的DH■型螺帽(heavyhex)英制螺栓(ASTMA307)的化学成份和机械性质:Chemical化学成份Carbon:碳Manganesemin锰Phosphorusmax磷Sulfurmax硫Boronmin硼GradeAHeatanalysisProductanalysismax0.29max0.33max0.90max0.93max0.04max0.041max0.15—③GradeBHeatanalysisProductanalysismax0.29max0.33max0.90max0.93max0.04max0.041max0.05max0.051备注: 1lbf=4.448N 1ksi=6.9Mpa1lbf=0.4593kgf强度等级GradeDesignation产品Products规格NominalSizeDiaInFullSizeBolts，Screws，Studs，SurfaceHardnessHardness硬度ProofLoadTensileStrengthYieldStrengthElongationin2inmin%ReductionAreamin%ofRockwell30NMaxBrinellHBRockwellHRBGradeABolts螺栓Studs螺柱Lessthan3xdia3xdiaandlonger/Min60ksi—18//121-241max24169-100max100

GradeBLessthan3xdia3xdiaandlonger/60-100ksi—18//121-212max21269-95max95GradeCAll/58-80ksi36（50）ksi23//Nohardnessrequired®Resulfurizedsteelisnotsubjecttorejectionbasedonproductanalysisforsulfur配合的螺帽为ASTMA563中的产品：1/4至1-1/2英寸普通产品配合的螺帽为ASTMA563的A普通螺帽(hex)；1-1/2至4英寸普通产品配合的螺帽为ASTMA563的A■型螺帽(heavyhex)；1/4至4英寸镀锌产品配合的螺帽为ASTMA563的A■型螺帽(heavyhex)英制雌(ASTMA354)的化学成份和机械性质:Chemical化学成份Carbon:碳Manganesemin锰Phosphorusmax磷Sulfurmax硫Boronmin硼Forsizethrough1-1/2inHeatanalysisProductanalysis0.30-0.530.28-0.55/max0.035max0.040max0.040max0.045/ForsizeLargethan1-1/2inHeatanalysisProductanalysis0.35-0.530.33-0.55/max0.035max0.040max0.040max0.045/强度等级GradeDesignation产品Products规格NominalSizeDiaInFullSizeBolts，Screws，Studs，SurfaceHardnessHardness硬度ProofLoadTensileStrengthYieldStrengthElongationin2inmin%ReductionofAreamin%Rockwell30NMaxBrinellHBRockwellHRCGradeBCBolts螺栓Studs螺柱1/4to2-1/2Over2-1/2105ksi95ksi125ksi115ksi109ksi99ksi16165045/255-331235-31126-3622-33GradeBD1/4to2-1/2Over2-1/2120ksi105ksi150ksi140ksii130ksi115ksi14144040/311-363293-36333-3931-39Thesevaluesaretheastheover-tappingrequiredforzinccoatednutsinSpecificationASTMA563译文：这些值为镀锌产品的要求，在ASTMA563中对螺帽有具体要求。英制螺栓(ASTMA193)的机械性质：GradeandClassDiameterin.TensileStrengthksiYieldStrength0.2%OffsetElongationin4Dmin%ReductionofAreamin%Hardness硬度MaxReferTonoteMinMinMinMinBrinellRockwellB5To1/4incl.100801650--■-1B6To1/4incl.1108515501B6XTo1/4incl.90701650--C261B7To2-U2incl.1251051650C351

Over2-1/2to4115951650--C35Over4to7100751850--C35To2・U2incl.1251051850321C35B16Over2-1/2to2110951745321C351Over4to7100851645321C35To4incl.100801850235B99B7MOver4to7100751850235B991,2Classes1and1D:B8,B8M,B8P,B8LN,B8MLNall75303050223B963,4Class1:B8C,B8Tall75303050223B964Class1A:B8A,B8CA,B8MA,B8PA,B8TA,B8LNA,B8MLNA,B8NA,B8MNA,B8MLCuNAall75303050192B903Classes1Band1D:B8N,B8MN,B8MLCuNall80353040223B963.4Class1Cand1D:B8Rall100553555271C283Class1C:B8RAall100553555271C283GradeandClassDiameterin.TensileStrengthksiYield-Strength0.2%OffsetElongationin4Dmin%ReductionofAreamin%Hardness硬度MaxReferToMinMinMinMinBrinellRockwellnoteClass1Cand1D:B8Sall95503555271C283Class1C:B8SAall95503555271C283Class2:B8,B8C,B8P,B8T,B8NTo3/4Over3/4to1Over1to1-1/4Over1-1/4to1-1/2incl.1251151051001008065501215202835354545321321321321C35C35C35C353,5Class2:B8M,B8MN,B8MLCuNTo3/4Over3/4to1Over1to1-1/4Over1-1/4to1-1/2incl.1101009590968065501520253045454545321321321321C35C35C35C353,53Class2B:B8,B8M2To2incl.Over2to2-1/2incl.Over2-1/2to3incl.959080756555253030404040321321321C35C35C353,5Class2C:B8M3To2incl.Over28585656030306060321321C35C353,5NOTES:TheminimumtemperatureforGradesB5,B6X,andB7shallbe1100°F;forGradeB16,1200°F;译文：等级为B5,B6X和B7的最小回火温度为1100°F，而等级为B16的最小回火温度为1200°FTomeetthetensilestrengthrequirements,thehardnessshallbeoverBrinell201(RockwellB94)minimum.译文：硬度一定要在201布氏(94HRB)硬度以上，抗拉强度一定能达到。Class1issolutiontreated-Class1Aissolutiontreatedinthefinishedconditionforcorrosionresistance;heattreatmentiscriticalduetophysicalpropertyrequirements.Class2issolutiontreatedandstrain-hardened.Austeniticsteelsinthestrain-hardenedconditionmaynotshowuniformpropertiesthroughoutthesectionparticularlyinsizesover3/4in.indiameter.译文：Class1将其视为1级对待，Class1A的材料应进行表面处理，具有防腐蚀性能，Class2类的各等级的材料应接受碳化物固溶处理后应变硬化奥氏体钢，尤为3/4以上的螺栓，经硬化后可能出现整个面上各部分性能不均匀现象.Fordiameters3/4in.andsmaller,amaximumhardnessofBrinell241(RockwellB100)ispermitted.译文：直径为3/4或更小的产品，硬度要求为最大241布氏(100HRB)硬度。Fordiameters1-1/2in.andlarger,center(core)propertiesmaybelowerthanindicatedbytestreportswhicharebasedonvaluesdeterminedatmid-radius.译文：直径为1-1/2或更大产品，芯部性能低于试验报告所点明的性能，因为试验报告依据的数值是在半径中点处测定的。Table3GradeIdentificationMarkingsforPopularGradesofCarbonSteelNutsGradeIdentificationMarkingSpecification规Material材料NominalSizein.ProofLoadStressk＜载何HardnessRockwell硬度SeeNote参见笔记MinMax◎ASTMA563-GradeOCarbonSteel1/4thru1-1/269B55C323,4ASTMA563-GradeACarbonSteel1/4thru1-1/290B68C323,4ASTMA563-GradeCarbonSteel1/4thru1120B69C323,4

NOMARKBOver1thru1-1/2105SAEJ995-Grade2CarbonSteel1/4thru1-1/290-C3211◎ASTMA563-GradeCCarbonSteelmaybeQuenchedandTempered1/4thru4144B78C385◎ASTMA563-GradeC3AtmosphericcorrosionResistantSteel,maybeQuenchedandTempered1/4thru4144B78C385,96ASTMA563-GradeDCarbonSteelmaybeQuenchedandTempered1/4thru4150B84C386◎SAEJ995-Grade5CarbonSteel1/4thru1120-C3212ASTMA563-GradeDHCarbonSteel,QuenchedandTempered1/4thru4175C24C386ASTMA563-GradeDH3AtmosphericcorrosionResistantSteel,QuenchedandTempered1/4thru4175C24C385,9ASTMA194-Grade1CarbonSteel1/4thru4130B70-2,7ASTMA194-Grade2MediumCarbonSteel1/4thru41501593522,7,8©ASTMA194-Grade2HMediumCarbonSteel,QuenchedandTempered1/4thru4175C24C352,7Table3GradeIdentificationMarkingsforPopularGradesofCarbonSteelNuts(Continued)GradeIdentificationMarkingSpecificationMaterialNominalSizein.ProofLoadStresskJ?载保HardnessRock度ell硬SeeNoteMinMax0ASTMA194-Grade2HMMediumCarbonSteel,QuenchedandTempered1/4thru41501592372,7,8

◎SAEJ995-Grade8MediumCarbonSteel,QuenchedandTempered1/4thru5/8150C24C3012over5/8thru1150C26C34>1"150C26C36◎ASTMA194-Grade4MediumCarbonAlloySteel,QuenchedandTempered1/4thru4175C24C382,7◎ASTMA194-Grade7MediumCarbonAlloySteel,QuenchedandTempered1/4thru4175C24C382,71ASTMA194-Grade7MMediumCarbonAlloySteel,QuenchedandTempered1/4thru41501592372,7,8SeeNotes1,210NOTES:（备注）Inadditiontotheindicatedgrademarking,allgrades,exceptA563aradeO,AandB,mustbemarkedformanufactureridentification.除所列等级标记外，所有等级（kA5*o.A、B级外卜）,必需注明厂家自己标记.ThemarkingsshownforallgradesofA194nutsareforcoldformedandhotforgednuts.Whennutsaremachinedfrombarstock,thenutmustbeadditionallymarkedwiththeletteFB'.ThelettersHandMindicateheatheatednu… —料蠢霰 囊哪E示当经岫机Nutsarenotrequiredtobemarkedunlessspecifiedbythepurchaser.vvI・e・■■■・arb^^s^j,■■■•・^^e・■■■■■ca■■o・■■■・a・・^js・・a・・fc^e■■■"^jra^^e・e・・e・％^. ■ IMF Im* "AorB.如为货方无特殊要求，螺帽上可以不注明等级标记•如果要注明的话，等级标Propertiesshownarethoseofnonplatedornoncoatedcoarsethreadhexnuts.Forpropertiesofothernutstyles,nutswithfinethreads,andplatedorcoatednuts,refertoTable3,pageB-171.所示机械性能，是非电窿粗牙、六角螺帽的机械性能。如牙、电镀螺帽的机械性能，参阅B171页，表3。Propertiesshownarethoseofcoarsethreadheavyhexnuts.所示机械性能是粗牙、重型六角螺帽的机械性能。Propertiesshownarethoseofcoarsethreadheavyhexnuts.Forpropertiesofothernutstylesandnutswithfinethreads,refertoTable3,pageB-112.所示机械性能是粗牙、重型六角螺帽的机械性能。细牙螺帽和其它类别螺帽的机械性能参阅B-112页，表3。Propertiesshownarethoseofcoarseand8-pitchthreadheavyhexnuts.Forpropertiesofcoarseand8-pitchhexnuts,refertoTable3,pageB-132.所示机械性能是粗牙，牙数为8的重型六角螺帽的机械性能。粗牙，牙数为的普通六角螺帽的机械性能参阕132页，表3。Hard-nessesareBrinellHardnessNumbers.硬度是布氏硬度。Thenutmanufacturer,athisoption,mayaddothermarkingstoindicate

theuseofatmosphericcorrosionresistantsteel.如采用防腐蚀钢材，螺帽生产厂家可增加其它标记。10.Specifications（详细说明）—

ASTMA563-CarbonandAl

ASTM书theuseofatmosphericcorrosionresistantsteel.如采用防腐蚀钢材，螺帽生产厂家可增加其它标记。10.Specifications（详细说明）—

ASTMA563-CarbonandAl

ASTM书A563嵌钢、合金5o螺SteBNu^s页pageB-167.ASTMA194/A194M-CarbonandAlloySteelNutsforBoltsforHighPressureandHighTemperatureService,pageB-126.ASTMA194/A194M经高压、高温处理的，与螺栓配套的碳钢，合金钢螺帽。Grade2Grade5不需打任何标记。and8应标记等级。HV表示维氏硬度，是硬度的一种测量方法及单位；KSI是千磅/平方英寸，是压强，具体地说是抗拉强度单位；抗拉强度和硬度之间非线性关系，一般可以查表换算：104KSI=HV220；HV250=116KSI1KSI=1000lb/in.2=1000x0.4536x9.8N/(25.4mm)2=6.89N/mm2Table2GradeIdentificationMarkingsforPopularGradesofCarbonSteelExternallyThreadedFastenersGradeIdentificationMarkingSpecificationMaterialNominalSizein.ProofLoadStressksiTensileStrengthMinksiHardnessRockwellSeeNoteMinMaxSAEJ429-Grade1LoworMedium1/4thru1-1/23360B70B100

SAEJ429-Grade2CarbonSteel1/4thru3/4over3/4thru1-1/255337460B80B70B100B100ASTMA307-GradeA1/4thru4-60B69B100ASTMA307-GradeB1/4thru4--60min100maxB69B95NoMarkSAEJ429-Grade4MediumCarbonSteel,QuenchedandTempered1/4thru1-1/265115--仅指studsSAEJ429-Grade5ASTMA449-Type1MediumCarbonSteel,QuenchedandTempered1/4thru1over1thru1-1/28574120105C25C19C34C30ASTMA449-Type1over1-1/2thru355901832353aSAEJ429-Grade5.1LoworMediumCarbonSteel,QuenchedandTemperedNo.6thru1/285120C25C404eSAEJ429-Grade5.2LowCarbonMartensiteSteel,QuenchedandTempered1/4thru185120C26C36ASTMA449-Type2C25C34◎ASTMA325-Type1MediumCarbonSteel,QuenchedandTempered1/2thru1over1to1-1/28574120105C24C19C35C3150ASTMA325-Type3AtmosphericcorrosionResistantSteel,QuenchedandTempered6Table2ContinuednextpageTable2GradeIdentificationMarkingsforPopularGradesofCarbonSteelExternallyThreadedFasteners(Continued)GradeIdentificationMarkingSpecificationMaterialNominalSizein.ProofLoadStressksiTensileStrengthMinksiHardnessRockwellSeeNoteMinMax

0ASTMA354-GradeBCMediumCarbonAlloySteel,QuenchedandTempered1/4thru2-1/2105125C26C36SAEJ429-Grade7MediumCarbonAlloySteel,QuenchedandTempered1/4thru1-1/2105133--热处理后再辗牙<曰SAEJ429-Grade8MediumCarbonAlloySteel,QuenchedandTempered1/4thru1-1/2120150C33C391ASTMA354-GradeBD1/4thru2-1/2120150C33C397NoMarkSAEJ429-Grade8.1MediumCarbonAlloyorSAE1541/1541H1/4thru1-1/2120150--仅指studs1SAEJ429-Grade8.2LowCarbonmartensiteSteel,QuenchedandTempered1/4thru1120150C33C39ASTMA490-Type1MediumCarbonAlloySteel,QuenchedandTempered1/2thru1-1/2120150min170maxC33C38ASTMA490-Type2LowCarbonMarten-siteSteel,QuenchedandTempered1/2thru1120150min170maxC33C380ASTMA490-Type3AtmosphericCorrosionResistantSteel,QuenchedandTempered1/2thru1-1/2120150min170maxC33C386NOTES：（备注）1.Inadditiontotheindicatedgrademarking,allgradesincludedinthistablemustbemarkedformanufactureridentification.除所列等级标记外，此表中所有等级必需标注厂家自己的标记。Whilehexheadsareshown,grademarkingsapplyequallytoproductswithotherheadconfigurations.如果是六角头型，等级标记等同与其它头型。HardnessesareBrinellHardnessNumbers.硬度为布氏硬度。Grade5.1isapopulargradeforSEMS.SEMS产品常用等级是5.1级参阅J-10页。

A325Type1boltsmayalsobemarkedwith3radiallines120°apartinadditiontoA325marking.A3251类产品，等级标记为 +A325。Theboltmanufacturer,athisoption,_mayaddothermarkingstoindicate_theuseof使tm|的是是耐耐腐蚀钢钢材resistantsteel.如采用防腐蚀钢材，厂家可增加其它标记来表明ASTMA354GradeBDmayhaveoptionallysixradiallines.ASTMA354BD级可采用六条线标记。8.Specifications—（详细说明:）SAEJ429—MechanicalandMaterialRequirementsforExternallyThreadedFasteners,pageB-79.SAEJ429—外螺纹紧固件机械性能与材质要求B-79页。AI'R/TA以dg 么rhcn J'vfcm么11'I'hr。么qf么nd么J、—efenaren—QOastmjA307CarbonSteelExiernally^ihieadedStandardFasteners,pageB-90.ASTMA307—碳钢外卜螺纹紧固件B-90页。ASTMA449—QuenchedandTemperedSteelBoltsandStuds,pageB-97.ASTMA449—淬火、回火（碳钢）螺栓、螺柱B-97页。ASTMA325—HighStrengthBoltsforStructuralSteelJoints,pageE-28.ASTMA325一高强度螺栓,E-28页。ASTMA354—QuenchedandTemperedAlloySteelBolts,Studs,andOtherExternallyThreadedFasteners,pageB-139.页。ASTMA490—HeatTreatedSteelStructuralBolts,150ksiMinimumTensileStrength,pageE-37.页。ASTMA490—HeatTreatedSteelStructuralBolts,150ksiMinimumTensileStrength,pageE-37.ASTMA490一热处理钢结构螺栓，抗拉强度最小50ksi,E-37页。附表一：ReferencetoFastenerIdentificationMarkingsSpecificationNo.MaterialSeeClauseNo.OnPageNoBolts,ScrewsandstudsSAEJ429Carbonsteel6B-79CarbonalloysteelASTMA307Carbonsteel13B-90ASTMA449Carbonsteel15B-97ASTMA354Carbonalloysteel15andS1B-139ASTMA193/A193MCarbonalloysteelstainlesssteel16andS5B-114ASTMA320/A320MCarbonalloysteelstainlesssteel11B-104ASTMF593stainlesssteel18B-148ASTMF468nonferrousalloys17B-158ASTMA325carbonsteel16E-28ASTMA490Carbonalloysteel18E-37ASTMA394Carbonsteel16E-44ASTMF901aluminum17.1andS2.1E-51NutsASTMA563Carbonsteel14B-167ASTMA194/A194MCarbonsteel14B-126CarbonalloysteelstainlesssteelASTMF594stainlesssteel18.1B-177ASTMF467nonferrousalloys17.1B-184WashersASTMF436ASTMF959CarbonsteelCarbonsteel1517L-24E-65螺帽机械性质：普通螺帽采用的标准：GB/T3098.2/4、ISO898.2/6、JISB1052.SAEJ995.DIN267.4、ASTMA563、ASTMA194、普通螺帽的机械性质：螺纹组合件在实际使用过程中由于超拧，可能产生下列失效形式：螺杆断裂；螺杆的螺纹脱扣；螺母的螺纹脱扣；螺母和螺杆的螺纹脱扣；螺杆的断裂是突然发生的，比较容易发现，而脱扣是逐渐发生的，很难发现并增加了因紧固件失效而造成事故的危险性。对螺纹连接件的失效的设计，总希望失效是发生在螺杆部分，因此其螺纹配套的设计为强度等级较高的螺母可以替代性能等级较低的螺母；螺栓螺母组合件的应力高于螺栓的屈服强度或保证应力是可行的；对于实际生产中超过螺栓保证载荷的拧紧时有发生的情况，对螺母的设计应至少保证在超拧10%时，螺纹组合件的失效是螺杆断裂；螺帽用材料：

GB3098/JISB1052性能等级化学成份％CmaxMnminPmaxSmax4、5、6/0.50一/一0.060/0.1100.1508、9040.580.250.0600.15010050.580.300.0480.150/0.05812/0.580.450.0480.150/0.0581） 、性能等级为05、8（＞M16的I型螺胃）、10和12级螺胃应进行淬火并回火处理。2） 、对于4、5、6和04、05级的螺胃可以用易切钢制造（供需双方另有协议除外），其硫。磷和铅的最大含量为：硫0.30%（0.34%）;磷0.11%;铅0.35%;3） 、对于10、12为改善螺胃的机械性能，必要时可以增添合金元素螺纹规格性能等级04054保证应力维氏硬度HV螺胃保证应力维氏硬度HV螺胃保证应力维氏硬度HV螺胃><minma热处理型式minma热处理型式minma热处理型式--M43801830不淬火回火薄型5002735淬火并回火薄型M4M7M7M1M1M16

M16M39510117302不淬火回火1螺纹规格性能等级568保证应力维氏硬度HV螺母保证应力维氏硬度HV螺母保证应力维氏硬度HV螺母><mima热处理型式mima热处理型式mima热处理型式--M45201330不淬火回火16001530不淬火回火1800180/17030不淬火回火1M4M7580670855/81200/188M7M1590680870/83M1M1610700880/84M1M363014720179202335淬火并回火螺纹规格性能等级8910保证应力Sp维氏硬度HV螺母保证应力Sp维氏硬度HV螺母保证应力Sp维氏硬度HV螺母><minmax热处理型式minmax热处理型式minmax热处理型式--M4900170302不淬火回21040272353淬火并回火1

M4M7915188火1040M7M109401040M10M169501050M16M39890180302不淬火回火29201060螺纹规格性能等级12保证应力维氏硬度HV螺母保证应力维氏硬度HV螺母><minmax热处理型式minmax热处理型式--M41140/1150295353淬火回火1115272353淬火回火2M4M71140/1150115M7M11140/1160116M1M「170/1190119M1M3120螺帽机械性质： 表一：GB3098.2/JISB1052

表二GB/T3098.4/JISB1052螺纹规格性能等级04055（日标无要求）保证应力Sp维氏硬度HV螺母保证应力Sp维氏硬度HV螺母保证应力Sp维氏硬度HV螺母minmax热处理型式minmax热处理型式minmax热处理型式8<d<10380188302不淬火回火薄型500272353淬火并回火薄型690175302不淬火回火110<d<1616<d<3372019033<d<39螺纹规格性能等级68保证应力Sp维氏硬度HV螺母保证应力Sp维氏硬度HV螺母保证应力Sp维氏硬度HV螺母minmax热处理型式minmax热处理型式minmax热处理型式8<d<10770188302不淬火回火1955250353淬火并回火1890195302不淬火回火210<d<1678016<d<338702331030291533<d<399301090/1030

螺纹规格性能等级1012保证应力维氏硬度HV螺母保证应力维氏硬度HV螺母保证应力维氏硬度HV螺母mima热处理型式mima热处理型式mima热处理型式8<d<101102935淬火回火110552535淬火回火212002935淬火回火210<d<1611116<d<33—--—108026—--33<d<391)D>16mm的螺母，可以淬火并回火，由制造者确定.表三:SAEJ995规定的机械性质：螺帽等级NutGrade螺帽称呼径NutSizeDia,in保证应力KSI/PSI硬度RockwellHardness粗牙UNC,8UN细牙UNF,12UN21/4thru1-1/290/90,00090/90,000C32max51/4thru1120/120,000109/109,000Over1thru1-1/2105/105,00094/94,00081/4thru5/8105/105,000150/150,000C24-C32Over5/8thru1