常用的螺纹底孔及公差规定(2 页)Good is good, but better carries it.精益求精，善益求善。常用的螺纹底孔及公差规定常用公制普通螺纹底孔尺寸（JB/GQ0123-80） （单位：mm）公称直径粗牙细 牙钻孔直径螺距 钻孔直径螺距 钻孔直径螺距钻孔直径M32.6±0.070.352.7±0.05////M43.4±0.070.53.6±0.05M54.3+0.1 -0.054.6±0.07M65.1+0.15 -0.050.755.3+0.15 -0.05M86.8+0.15 -0.057.3+0.15 -0.0517.1±0.1M108.6+0.15 -0.0519.1+0.15 -0.051.258.9±0.1M1210.3+0.15 -0.0511.1+0.15 -0.0510.9±0.11.510.6+0.15 -0.05M1412.1+0.15 -0.0513.1+0.15 -0.051.512.6±0.1//M1614.1+0.15 -0.1015.1+0.15 -0.0514.6±0.1M1815.6+0.2 -0.117.1+0.15 -0.0516.6±0.1216.1+0.2 -0.1M2017.6+0.2 -0.119.1+0.15 -0.0518.6±0.118.1+0.2 -0.1M2219.6+0.2 -0.121.1+0.15 -0.0520.6±0.120.1+0.2 -0.1M2421.1+0.2 -0.123.1+0.15 -0.0522.6±0.122.1+0.2 -0.1M3026.6+0.3 -0.129.1+0.15 -0.0528.6±0.128.1+0.2 -0.1M3329.6+0.3 -0.11.531.6+0.2 -0.1////M3632.1+0.3 -0.134.6+0.2 -0.1234.1±0.15333.1+0.2 -0.155°密封圆锥内螺纹底孔尺寸（GB/T7306-1987）常用圆柱管螺纹底孔尺寸（JB/GQ0130-80）公称直径钻孔直径公称直径钻孔直径Rc1/16′6.6+0.1 -0.05G1/8′8.8±0.1Rc1/8′8.6+0.1 -0.05G1/4′11.7+0.2 -0.1Rc1/4′11.5+0.15 -0.05G3/8′15.2+0.2 -0.1Rc3/8′15+0.15 -0.05G1/2′19+0.2 -0.1Rc1/2′18.7+0.15 -0.05G5/8′21+0.2 -0.1Rc3/4′24.2+0.2 -0.05G3/4′24.5+0.2 -0.1Rc1′30.3+0.2 -0.1G1′30.7+0.25 -0.15Rc1 1/4′39+0.2 -0.1G1/16′6.7Rc1 1/2′44.9+0.2 -0.1//Rc2′56.7+0.2 -0.1//Rc2 1/2′72.4+0.2 -0.1//1/2”-20UNF10.8+0.2 -0.1 (12.7)~-·：,—>;…！@`—}[$@：!（<…^)?/>/~^
