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螺螺丝丝攻攻牙牙钻钻孔孔径径和和滚滚造造径径对对照照表表 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 M1.00.250.750.7850.729NO.1-641.8541.551.5821.425 M1.10.250.850.8850.829NO.2-562.1841.801.8711.695 M1.20.250.950.9850.985NO.3-482.5152.102.1461.941 M1.40.31.101.1421.075NO.4-402.8452.302.3852.157 M1.60.351.251.3211.221NO.5-403.1752.602.6972.487 M1.70.351.351.4211.321NO.6-323.5052.802.8952.642 M1.80.351.451.5211.421NO8-324.1663.403.533.302 M2.00.41.601.6791.567NO.10-244.8263.903.9623.683 M2.20.451.751.8381.713NO.12-245.4864.504.5974.344 M2.30.41.901.9791.8671/4-205.105.2574.979 M2.50.452.102.1382.0135/16-186.606.7316.401 M2.60.452.202.2382.1133/8-168.008.1537.798 M3.00.52.502.5992.4597/16-149.409.559.144 M3.00.62.402.4402.2801/2-1310.8011.02310.592 M3.50.62.903.0102.8509/16-1212.2012.44611.989 M4.00.73.303.4223.2425/8-1113.6012.86813.386 M4.00.753.253.3263.1063/4-1016.5018.84016.307 M4.50.753.803.8783.6887/8-919.5019.76119.177 M5.00.84.204.3344.134122.2022.60621.971 M5.00.94.104.1703.9301-1/8-725.0025.34924.638 M6.01.05.005.1534.9171-1/4-728.2028.52427.813 M7.01.06.006.1535.9171-3/8-630.8031.11530.353 M8.01.256.806.9126.6471-1/2-634.0034.29033.528 M9.01.257.807.9127.6471-3/4-539.5039.82738.964 M101.58.508.6768.3762-4-1/245.2045.59344.679 M111.59.509.6769.376 M121.7510.3010.44110.106 M142.012.0012.21011.835 M162.014.0014.21013.835 M182.515.5015.74415.294 M202.517.5017.74417.294 M222.519.5019.74419.294 M243.021.0021.25220.752 M273.024.0024.25223.752 M303.526.5026.77126.211 螺螺丝丝攻攻牙牙钻钻孔孔径径和和滚滚造造径径对对照照表表 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 M1.00.20.800.8210.783NO.0-801.5241.251.3051.182 M1.10.20.900.9210.883NO.1-721.8541.551.6121.474 M1.20.21.001.0210.983NO.2-642.1841.851.9121.756 M1.40.21.201.2211.183NO.3-562.5152.102.1972.025 M1.60.21.401.4211.383NO.4-482.8452.402.4582.271 M1.70.21.451.5001.460NO.5-443.1752.702.7402.551 M1.80.21.601.6211.583NO.6-403.5052.903.0222.820 M2.00.251.751.7851.729NO.8-364.1663.503.6063.404 M2.20.251.951.9851.929NO.10-324.8264.104.1653.963 M2.30.252.052.0612.001NO.12-285.8464.604.7244.496 M2.50.352.202.2212.1211/4-285.505.5885.360 M2.60.352.202.2462.1865/16-246.907.0356.782 M3.00.352.702.7212.6213/8-248.508.6368.382 M3.50.353.203.2213.1217/16-209.9010.0339.729 M4.00.53.503.5993.4591/2-2011.5011.60711.329 M4.50.54.004.0993.9599/16-1812.9013.08112.751 M5.00.54.504.5994.4595/8-1814.5014.68114.351 M5.50.55.005.0994.9593/4-1617.5017.67817.323 M6.00.755.305.3785.1887/8-1420.5020.67520.270 M6.00.55.505.5505.4001-1223.2023.57123.114 M7.00.756.306.3786.1881-1/8-1226.5026.74626.289 M7.00.56.506.5506.4001-1/4-1229.5029.92129.464 螺螺丝丝攻攻牙牙钻钻孔孔径径和和滚滚造造径径对对照照表表 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 M8.01.07.007.1536.9171-3/8-1232.8033.09632.639 M8.00.757.307.3787.1881-1/2-1236.0036.27135.814 M8.00.57.507.5207.400 M9.01.08.008.1537.917 M9.00.758.308.3788.188 M101.258.808.9128.647 M101.09.009.1538.917 M100.759.309.3789.188 M100.59.509.5209.400 M111.010.0010.1539.917 M110.7510.3010.37810.188 M121.510.5010.67610.376 M121.2510.8010.91210.647 M121.011.0011.15310.917 M120.511.5011.52011.400 M141.512.5012.67612.376 M141.013.0013.15312.917 M151.513.5013.67613.376 M151.014.0014.15313.917 M161.514.5014.67614.376 M161.015.0015.15314.917 M171.515.5015.67615.376 螺螺丝丝攻攻牙牙钻钻孔孔径径和和滚滚造造径径对对照照表表 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 M171.016.0016.15315.917 M182.016.0016.21015.835 M181.516.5016.67616.376 M181.017.0017.15316.917 M202.018.0018.21017.835 M201.518.5018.67618.376 M201.019.0019.15318.917 M222.020.0020.21019.835 M221.520.5020.67620.376 M221.021.0021.15320.917 M242.022.0022.21021.835 M241.522.5022.67622.376 M241.023.0023.15322.917 M252.023.0023.21022.835 M251.523.5023.67623.376 M251.024.0024.15323.917 M261.524.5024.67624.376 M272.025.0025.21024.835 M271.525.5025.67625.376 M271.026.0026.15325.917 M282.026.0026.21025.835 M281.526.5026.67626.376 螺螺丝丝攻攻牙牙钻钻孔孔径径和和滚滚造造径径对对照照表表 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 M281.027.0027.15326.917 M303.027.0027.25226.752 M302.028.0028.21027.835 M301.528.5028.67628.376 M301.029.0029.15328.917 M322.030.0030.21029.835 M321.530.5030.67630.376 M333.030.0030.25229.752 M332.031.0031.21030.835 M331.531.5031.67631.376 M351.533.5033.67633.376 M363.033.0033.25232.752 M362.034.0034.21033.835 M361.534.5034.67634.376 螺螺丝丝攻攻牙牙钻钻孔孔径径和和滚滚造造径径对对照照表表 公制迫牙丝攻钻孔径美制迫牙丝攻钻孔径 规格 精度等级 规格 精度等级 G4-G6G7-G8G9G4-G6G7-G8G9 M1.00.250.860.88－NO.2-56UNC1.94－－ M1.10.250.960.98－NO.3-482.23－－ M1.20.251.061.08－NO.4-402.50－－ M1.40.31.241.25－NO.5-402.83－－ M1.60.351.411.43－NO.6-323.07－－ M1.70.351.511.53－NO.8-323.733.77－ M1.80.351.611.63－NO.10-244.244.3－ M2.00.41.781.80－NO.12-244.904.96－ M2.20.451.951.98－1/4-20－5.72－ M2.30.42.082.10－5/16-18－7.24－ M2.50.452.252.28－3/8-16－8.748.81 M2.60.452.352.38－7/16-14－10.2010.30 M3.00.52.732.75－1/2-13－11.2711.82 M3.50.63.173.20－NO.2-64UNF1.97－－ M4.00.73.623.653.69NO.3-562.27－－ M5.00.84.564.604.64NO.4-482.56－－ M6.01.05.455.505.55NO.5-442.86－－ M7.01.06.456.506.55NO.6-403.16－－ M8.01.257.317.387.44NO.8-363.78－－ M101.59.189.259.32NO.10-324.394.43－ M101.259.319.389.44NO.12-284.995.04－ M121.7511.0411.1211.211/4-285.855.90－ M121.2511.3111.3811.445/16-247.367.41－ 3/8-24－9.00－ 7/16-20－10.4810.54 1/2-20－12.0712.13 美制特细螺纹英制电器螺纹 规格UNEF标准径 2级牙钻孔径 规格钻孔径 最大最小 NO.12-324.704.8264.6232BA4.0-4.2 1/4 -325.605.6905.4863BA 5/16 -327.107.2647.0874BA3.0-3.2 3/8 -328.708.8658.6615BA2.7-2.8 7/16 -2810.2010.33810.1356BA2.4-2.5 1/2 -2811.8011.93811.709 9/16 -2413.2013.38613.132 5/8 -2414.8014.98614.732 3/4 -2017.8017.95817.678 7/8 -2021.0021.13320.853 1 -2024.0024.30824.028 螺螺丝丝攻攻牙牙钻钻孔孔径径和和滚滚造造径径对对照照表表 英制管螺纹英制管螺纹美制管螺纹 规格标准径 钻孔径 规格 标准径 有交牙部之 长度（最小 ）中之毋螺 牙内径 标准长度（ 最小）中之 毋螺牙内径 规格 钻孔径 最大最小 使用纹刀 时 不用纹刀 时 NPT NPS 使用绞刀时不用绞刀时 PS 1/16 - 286.506.6326.490PT 1/16 - 286.106.206.2446.3841/16 - 276.106.256.35 PS 1/8 - 288.508.6378.495PT 1/8 - 288.108.208.2498.3881/8 - 278.338.438.74 PS 1/4 - 1911.4011.54911.341PT 1/4 - 1910.7011.0010.96211.1741/4 - 1810.7211.1311.13 PS 3/8 - 1915.0015.05414.846PT 3/8 - 1914.2014.5014.44814.6583/8 - 1814.2714.2714.68 PS 1/2 - 1418.5018.77318.489PT 1/2 - 1417.6018.0017.97918.2631/2 - 1417.4817.8618.26 PS 3/4 -1424.0024.25923.975PT 3/4 - 1423.0023.5023.37823.6633/4 - 1422.6323.0123.42 PS 1 - 1130.2030.47130.111PT 1- 1129.0029.5029.45929.8221 - 11-1/228.5828.9829.36 PS 1-1/4 - 1138.8039.13238.772PT 1-1/4 - 1137.5038.0037.97638.3391-1/4-11-1/237.3137.6938.10 PS 1-1/2 - 1144.8045.02544.665PT 1-1/2 - 1143.4044.0043.86944.2321-1/2-11-1/243.6644.0444.45 PS 2 - 1156.5056.83656.476PT 2 - 1154.9055.5055.41255.8442 - 11 - 1/255.5855.9656.36 螺螺丝丝攻攻牙牙钻钻孔孔径径和和滚滚造造径径对对照照表表 英制螺纹公制螺纹针车用螺纹 规格UNEF 钻孔径 规格滚造径规格滚造径 硬材软材 W 1/8 - 402.652.60M30.52.63-2.60SM1/8-402.735-2.688 W 5/32 - 323.253.20M3.00.62.56-2.53SM1/8-442.769-2.722 W 3/16 - 243.753.70M3.50.63.06-3.03SM9/64-403.128-3.083 W 1/4 - 205.105.00M4.00.73.49-3.45SM11/64-403.855-3.805 W 5/16 - 186.606.50M4.00.753.45-3.41SM3/16-324.205-4.155 W 3/8 - 168.007.90M4.50.753.96-3.92SM3/16-284.143-4.093 W 7/16 - 149.409.30M5.00.84.43-4.38SM7/32-325.003-4.955 W 1/2 - 1210.7010.50M5.00.94.36-4.31SM15/64-285.325-5.570 W 9/16 - 1212.3012.00M6.01.05.30-5.25SM1/4-405.890-5.735 W 5/8 - 1113.7013.50M7.01.06.30-6.25SM1/4-285.721-5.366 W 3/4 - 1016.7016.50M8.01.07.28-7.23SM9/32-286.508-6.648 W 7/8 - 919.5019.30M8.01.257.12-7.07SM11/32-288.092-8.432 W1 - 822.4022.00SM3/8-288.880-8.015 W 1-1/8 - 725.0024.80SM7/16-2810.466-10.401 W 1 - 1/4 - 728.3028.00SM7/16-1610.037-9.967 SM1/2-2011.819-11.749 SM9/26-2013.400-13.425
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