(高清版)GB∕T 39542.2-2020 技术制图活动铅笔 第2部分：黑铅芯 分类和尺寸

GB/T39542.2—2020/ISO9177-2:1989第2部分：黑铅芯分类和尺寸(ISO9177-2:1989,Mechanicalpencils—Part2:Blackleads—Classificationanddimensions,IDT)国家市场监督管理总局国家标准化管理委员会IGB/T39542.2—2020/ISO9177-2:1989 本部分为GB/T39542的第2部分。本部分使用翻译法等同采用ISO9177-2:1989《活动铅笔第2部分：黑铅芯分类和尺寸》。——GB/T4457.4—2002机械制图图样画法图线(ISO128-24:1999,MOD);——GB/T17450—1998技术制图图线(ISO128-20:1996,IDT); GB/T39542.1—2020技术制图活动铅笔第1部分：分类、尺寸、性能要求和试验本部分做了下列编辑性修改：—-表2中增加了一个页下脚注；公司。1GB/T39542.2—2020/IS rtechnicaldrawings—Part1:Classification,dimensions,perfor3.14分类黑铅芯应按硬度等级(见表1)、公称直径(见第5章)和黑铅芯的类型(即树脂铅芯或石墨铅芯)2GB/T39542.2—2020/ISO9177-2:1989公称真径/mm硬度等级(见3.2)6H,5H,4H,3H,2H,H,FHB,B,2B129H、8H、7H、6H,5H,4H,3H,2H,H,FHB,B,2B,3B,4B,5B,6B5尺寸5.1直径铅芯直径应符合表2规定。线迹宽度铅芯直径公称直径实际直径和公差0.25*—0.35+8020.5+8.050a+0.03-0.0111一0.081-0.12一一222±0.05·目前尚无相应的铅芯¹).通常在活动铅笔和包装上可以标志为0.3和0.9。使用者应注意采用新标准化标志的铅芯完全适用于采用旧标志的活动铅笔，反之亦然，即0.35和1分别对应0.3和0.9。铅芯长度应符合表3规定。GB/T39542.2—2020/ISO9177-2:1989表3长度单位为毫米铅芯类型公称直径长度活动铅笔的机械结构类型(见ISO9177-1)P或C0.35160±1或90±1或F30±1或45±1S225±1*或L·适用于圆规使用的长度。6标志b)本部分编号(即GB/T39542.2);c)类型分类字母(即P或C);黑铅芯GB/T39542.2-P-0.5-60黑铅芯GB/T39542.2-C-2-130GB/T39542.2—2020/ISO9177-2:1989[1]QB/T1024—2018活动铅笔用黑铅芯打印日期：2020年11月27日版权专有侵权必究定价：14.00元Porte-mine—Partie2:Minesgraphite-ClassificationetdimensionsISO9177-2:1989(E)CopyrightIntemafonalOrgarizationforStandardizafionProvidedbyIHSunderlioensewithISONoreproductionornetworkingpermittedwithoutlioensotromIHSISO(theInternationalOrganizationforStandardization)isaworldwidefederationofnationalstandardsbodies(ISOmemberbodies).TheworkofpreparingInternationalStandardsisnormallycarriedoutthroughISOtechnicalcommittees.Etherighttoberepresentedonthatcommittee.Internationalorganizations,govern-mentalandnon-governmental,inliaisonwithISO,alsotakecollaboratescloselywiththeInternationalElectrotechnicalCommission(IEC)onallmattersofelectrotechnicalstandardization.DraftInternationalStandardsadoptedbythetechnicalcommitteestheISOCouncil.TheyareapprovedinaccordancewithISOproceduresrequiringatleast75%approvalbythememberbodiesvoting.UsersshouldnotethatallInternationalStandardsundergolatestedition,unlessotherwisestated.Casepostale56·CH-1211Genève20·SwitzerlandCopyrghtIntermationalOrganizafonforStandardizafionProvdedbyIHSundericensewithISONoreproductionornetworungpermittedwithoutlicensefromIHSNotforResaleISO128,Technicaldrawings-Generalprinciplesofpresen-tation.ISO9177-1,Mechanicalpencils-Part1:Classification,dimensions,performancerequirementsandtesting.bon(e.g.graphite)andabindingagent3.2hardnessdegree:Classificationindicatingincreasingtable1),tothenominaldiamofblacklead(i.e.polymerorceramic).Table1-Classificationaccordingtohardnessdegree16H,5H,4H,3H,2H,H,F,HB,B,2B9H,8H,7H,6H,5H,4H,3H,2H,H,F,HB,B,2B,3B,4B,5B,6BTable2-DiametersNominalActualdiameter一0,352)一1一2)Currentpracticeistolabelormarkmechanicalpencilsandboxes1CoprlghtIntemationalOrganizationforStandardizationProvidodbyIHSunderlcensewthINoreproducionornetworkingpermittodwithoutlicensefromIHSISO9177-2:1989(E)Table3-LengthsDimensionsinmilimetresC1FS2L6Designationcomprise,intheordergiven,thefollowingelements:b)thenumberofthispartofISO9177(i.e.ISO9177-2);d)thenominaldiameter,inmillimetres;e)thelength,inmillimetres.Thedesignationshallbeclearlyindicatedonthepackagingand,ifpossible,onthelead¹).Designationexamples:lengthof60mmshallbedesignatedasfollows:ISO9177andhavinganominaldiameterof2mmandalengthUDC74