GB/T5780—2016表2(续)单位为毫米螺纹规格dM39M45M52M60Pa44.5 55.5b一一b参考90102116一d103115129145max1111d.max45.452.662.671max40 4653.261.2d.min384450.858.8dvmin55.8664.774.283.41emin66.4476.9588.2599.21公称25283338kmax26.0529.0534.2539.25min23.9526.9531.7536.75kwmin16.7718.8722.2325.73rmin11.21.62公称=max60.070.080.090.0min58.868.178.187.81,和。La.公称minmaxminmaxminmaxminmaxminmax6058.561.56563.566.5折线以上的规格推荐采用GB/T57817068.571.58078.581.59088.2591.7510098.25101.759

GB/T5780—2016表2（续）单位为毫米螺纹规格dM39M45M52M601l，和lglg公称min1gmaxminmaxminmaxminmaxminmax110108.25111.75120118.25121.7513012813214013814215014815240601601561645070 180176184709055.578200195.4204.69011075.59859 84220215.4224.69711782.51056691240235.4244.6117137102.51258611167.595260254.8265.2137157122.514510613187.5115280274.8285.2157177142.5165126151107.5135300294.8305.2177197162.5185146171127.5155320314.3325.7197217182.5205166191147.5175340334.3345.7217237202.5225186211167.5195360354.3365.7237257222.5245206231187.5215380374.3385.7257277242.5265226251207.5235400394.3405.7277297262.5285246271227.5255420413.7426.3282.5305266291247.5275440433.7446.3302.5325286311267.5295460453.7466.3306331287.5315480473.7486.3326351307.5335500493.7506.3346371327.5355注：优选长度由l.mi和Lgmax确定。一螺距。bl公称≤125mm。125mm200 mm。 k w min =0.7k min 。f lgmax=l公称—b。l in =lemx —5P。10

技术条件和引用标准见表3.

GB/T 5780—2016

表3技术条件和引用标准

标记方法按GB/T1237规定

三层标准规范范本螺纹规格为M12、公称长度1=80mm、性能等级为4.8级、表面不经处理、产品等级为C级的六角 头螺栓的标记：

螺栓GB/T5780M12X80