【英文标准名称】:StandardSpecificationforSurfaceDiscontinuitiesofBolts,Screws,andStuds,InchandMetricSeries
【原文标准名称】:英制及公制系列的螺栓、螺钉及螺柱的表面不均匀性的标准规范
【标准号】:ASTMF788/F788M-2008
【标准状态】:现行
【国别】:美国
【发布日期】:2008
【实施或试行日期】:
【发布单位】:美国材料与试验协会(US-ASTM)
【起草单位】:F16.93
【标准类型】:(Specification)
【标准水平】:()
【中文主题词】:
【英文主题词】:bolts;crack;discontinuities(surface);fold;screw(machine,sems,tapping);seam;studs;threadlap;void;Boltingmaterials;Discontinuities--fasteners;Fasteners(metal)--specifications;Screws--specifications;Stainlesssteelscrews--specifications;
【摘要】:1.1Thisspecificationestablishesallowablelimitsforthevarioustypesofsurfacediscontinuitiesthatmayoccurduringthemanufactureandprocessingofbolts,screws,andstuds,includingheat-treatedmachinescrews,tappingscrews,andsems(thewashersofscrew-washerassembliesareexcluded).Thisspecificationcoversmetricseriesproductswithnominaldiametersof4mmandlargerandwithspecifiedminimumtensilestrengthsof420MPaandhigher;andinchseriesproductswithnominaldiametersofNo.5(0.1250in.)andlargerandwithspecifiedminimumtensilestrengthsof60000psiandhigher.1.2Whentheengineeringrequirementsoftheapplicationnecessitatecontrolofsurfacediscontinuitiesonbolts,screws,orstuds,thepurchasershallspecifyconformancetoASTMSpecificationF788/F788M,intheoriginalinquiryandpurchaseorder.1.2.1Whentheengineeringrequirementsoftheapplicationnecessitatethatsurfacediscontinuitiesonbolts,screws,andstudsbecontrolledwithinlimitscloserthanthosespecifiedinthisspecification,thepurchasershallspecifytheapplicablelimitsintheoriginalinquiryandpurchaseorder.1.3Theallowablelimitsestablishedinthisspecificationformetricbolts,screws,andstudswithnominaldiametersfrom4to24mminclusive,areessentiallyidenticalwithrequirementsgiveninISO6157/I.TherearenoISOstandardsforsurfacediscontinuitiesonanyinch-seriesproducts.1.4ThevaluesstatedineitherSIunitsorinch-poundunitsaretoberegardedseparatelyasstandard.Thevaluesstatedineachsystemmaynotbeexactequivalents;therefore,eachsystemshallbeusedindependentlyoftheother.Combiningvaluesfromthetwosystemsmayresultinnon-conformancewiththestandard.
【中国标准分类号】:J13
【国际标准分类号】:21_060_10
【页数】:6P.;A4
【正文语种】:英语