GB/T70.2-2000允许制造的型式注：对切制内六角，当尺寸达到最大极限时，由于钻孔造成的过切不应超过内六角任何一面长度()的20。1)内六角口部允许稍许倒圆或沉孔。2)末端倒角，M4的为辗制末端，见GB/T2.3)不完整螺纹的长度u2P。图1表1尺寸mm螺纹规格dM3M4M5M6M8M10M12M16pu0.50.70.811.251.51.752max1.01.41.622.503.03.50min0.50.70.81.251.51.75dmax3.64.75.76.89.211.214.218.2max5.77.609.5010.5014.0017.5021.0028.00dmin5.47.249.1410.0713.5717.0720.4827.48min2.32.873.444.585.726.869.1511.43max1.652.202.753.34.45.56.608.80min1.401.952.503.04.15.26.248.44min0.10.20.20.250.40.40.60.6
