螺丝攻牙钻孔径和滚丝径对照表 公制粗螺纹 美制粗螺纹 规格标准径2级牙钻孔径规格（UNC）标准径2级牙钻孔径最大最小最大最小M1.0×0.250.750.7850.729NO.1-64(1.854)1.551.5821.425M1.1×0.250.850.8850.829NO.2-56(2.184)1.801.8711.695M1.2×0.250.950.9850.985NO.3-48(2.515)2.102.1461.941M1.4×0.31.101.1421.075NO.4-40(2.845)2.302.3852.157M1.6×0.351.251.3211.221NO.5-40(3.175)2.602.6972.487M1.7×0.351.351.4211.321NO.6-32(3.505)2.802.8952.642M1.8×0.351.451.5211.421NO8-32(4.166)3.403.533.302M2.0×0.41.601.6791.567NO.10-24(4.826)3.903.9623.683M2.2×0.451.751.8381.713NO.12-24(5.486)4.504.5974.344M2.3×0.41.901.9791.8671/4-205.105.2574.979M2.5×0.452.102.1382.0135/16-186.606.7316.401M2.6×0.452.202.2382.1133/8-168.008.1537.798M3.0×0.52.502.5992.4597/16-149.409.559.144M3.0×0.62.402.4402.2801/2-1310.8011.02310.592M3.5×0.62.903.0102.8509/16-1212.2012.44611.989M4.0×0.73.303.4223.2425/8-1113.6012.86813.386M4.0×0.753.253.3263.1063/4-1016.5018.84016.307M4.5×0.753.803.8783.6887/8-919.5019.76119.177M5.0×0.84.204.3344.134122.2022.60621.971M5.0×0.94.104.1703.9301-1/8-725.0025.34924.638M6.0×1.05.005.1534.9171-1/4-728.2028.52427.813M7.0×1.06.006.1535.9171-3/8-630.8031.11530.353M8.0×1.256.806.9126.6471-1/2-634.0034.29033.528M9.0×1.257.807.9127.6471-3/4-539.5039.82738.964M10×1.58.508.6768.3762-4-1/245.2045.59344.679M11×1.59.509.6769.376M12×1.7510.3010.44110.106M14×2.012.0012.21011.835M16×2.014.0014.21013.835M18×2.515.5015.74415.294M20×2.517.5017.74417.294M22×2.519.5019.74419.294M24×3.021.0021.25220.752M27×3.024.0024.25223.752M30×3.526.5026.77126.211 螺丝攻牙钻孔径和滚丝径对照表 公制细螺纹 美制细螺纹 规格标准径2级牙钻孔径规格（UNC）标准径2级牙钻孔径最大最小最大最小M1.0×0.20.800.8210.783NO.0-80(1.524)1.251.3051.182M1.1×0.20.900.9210.883NO.1-72(1.854)1.551.6121.474M1.2×0.21.001.0210.983NO.2-64(2.184)1.851.9121.756M1.4×0.21.201.2211.183NO.3-56(2.515)2.102.1972.025M1.6×0.21.401.4211.383NO.4-48(2.845)2.402.4582.271M1.7×0.21.451.5001.460NO.5-44(3.175)2.702.7402.551M1.8×0.21.601.6211.583NO.6-40(3.505)2.903.0222.820M2.0×0.251.751.7851.729NO.8-36(4.166)3.503.6063.404M2.2×0.251.951.9851.929NO.10-32(4.826)4.104.1653.963M2.3×0.252.052.0612.001NO.12-28(5.846)4.604.7244.496M2.5×0.352.202.2212.1211/4-285.505.5885.360M2.6×0.352.202.2462.1865/16-246.907.0356.782M3.0×0.352.702.7212.6213/8-248.508.6368.382M3.5×0.353.203.2213.1217/16-209.9010.0339.729M4.0×0.53.503.5993.4591/2-2011.5011.60711.329M4.5×0.54.004.0993.9599/16-1812.9013.08112.751M5.0×0.54.504.5994.4595/8-1814.5014.68114.351M5.5×0.55.005.0994.9593/4-1617.5017.67817.323M6.0×0.755.305.3785.1887/8-1420.5020.67520.270M6.0×0.55.505.5505.4001-1223.2023.57123.114M7.0×0.756.306.3786.1881-1/8-1226.5026.74626.289M7.0×0.56.506.5506.4001-1/4-1229.5029.92129.464M8.0×1.07.007.1536.9171-3/8-1232.8033.09632.639M8.0×0.757.307.3787.1881-1/2-1236.0036.27135.814M8.0×0.57.507.5207.400M9.0×1.08.008.1537.917M9.0×0.758.308.3788.188M10×1.258.808.9128.647M10×1.09.009.1538.917M10×0.759.309.3789.188M10×0.59.509.5209.400M11×1.010.0010.1539.917M11×0.7510.3010.37810.188M12×1.510.5010.67610.376M12×1.2510.8010.91210.647M12×1.011.0011.15310.917M12×0.511.5011.52011.400M14×1.512.5012.67612.376M14×1.013.0013.15312.917M15×1.513.5013.67613.376M15×1.014.0014.15313.917M16×1.514.5014.67614.376M16×1.015.0015.15314.917M17×1.515.5015.67615.376M17×1.016.0016.15315.917M18×2.016.0016.21015.835M18×1.516.5016.67616.376M18×1.017.0017.15316.917M20×2.018.0018.21017.835M20×1.518.5018.67618.376M20×1.019.0019.15318.917M22×2.020.0020.21019.835M22×1.52。