螺丝攻下孔径对照表

螺丝攻牙钻孔径和滚造径对照表
公制粗螺纹
规格 标准径 2级牙钻孔径 最大 最小 规格
本表所推选之钻头孔径，是针对攻牙加工时，能够很容易的了解钻孔直径；而依抿市售之标准钻头所选定的，在使用钻头的情 精度有很大的影响，所以使用本表之钻孔径，若有不当之处，应视实际壮况适当的变更钻头直径，本表是依据2级牙
公制细螺纹
标准径 2级牙钻孔径 最大 最小
公制迫牙丝攻钻孔径
规格 精 度 等级 G4-G6 G7-G8 G9
M1.0*0.25 M1.1*0.25 M1.2*0.25 M1.4*0.30 M1.6*0.35 M1.7*0.35 M1.8*0.35 M2.0*0.40 M2.2*0.45 M2.3*0.40 M2.5*0.45 M2.6*0.45 M3.0*0.50 M3.0*0.60 M3.5*0.60 M4.0*0.70 M4.0*0.75 M4.5*0.75 M5.0*0.80 M5.0*0.90 M6.0*1.00 M7.0*1.00 M8.0*1.25 M9.0*1.25 M10*1.50 M11*1.50 M12*1.75 M14*2.00 M16*2.00 M18*2.50 M20*2.50 M22*2.50 M24*3.00 M27*3.00 M30*3.50
11.153 11.520 12.676 13.153 13.676 14.153 14.676 15.153 15.676 16.153 16.210 16.676 17.153 18.210 18.676 19.153 20.210 20.676 21.153 22.210 22.676 23.153 23.210 23.676 24.153 24.676 25.210 25.676 26.153 26.210 26.676 27.153 27.152 28.210 28.676 29.153 30.210 30.676 30.252 31.210 31.676 33.676 33.252 34.210 34.676

螺丝攻下孔径对照表上限下限上限下限上限下限上限下限上限下限M1.0*0.250.750.7850.729M1.0*0.20.800.8210.783NO.1 UNC64 1.55 1.582 1.425NO.0 UNF801.25 1.305 1.1821/16W60 1.15 1.2 1.1M1.1*0.250.750.8850.829M1.1*0.20.900.9210.883NO.2UNC56 1.80 1.871 1.695NO.1 UNF721.55 1.612 1.4743/32W48 1.8 1.9 1.7M1.2*0.250.950.9850.929M1.2*0.2 1.00 1.0210.983NO.3 UNC48 2.10 2.146 1.941NO.2 UNF641.85 1.912 1.7561/8W40 2.6 2.65 2.60M1.4*0.25 1.10 1.142 1.075M1.4*0.2 1.20 1.2211.183NO.4 UNC402.30 2.385 2.157NO.3 UNF562.10 2.1972.0255/32W323.2 3.25 3.20M1.6*0.35 1.25 1.321 1.221M1.6*0.21.40 1.421 1.383NO.5 UNC402.60 2.697 2.487NO.4 UNF582.402.458 2.2713/16W243.6 3.75 3.25M1.7*0.45 1.35 1.4211.321M1.8*0.2 1.60 1.621 1.583NO.6 UNC322.80 2.8952.642NO.5 UNF442.70 2.740 2.5511/4W20 5.0 5.1 5.0M1.8*0.45 1.45 1.521 1.421M2.0*0.25 1.75 1.785 1.729NO.8 UNC323.40 3.530 3.302NO.6 UNF402.90 3.022 2.8205/16W18 6.5 6.6 6.5M2.0*0.5 1.60 1.679 1.567M2.5*0.35 2.20 2.221 2.121NO.10 UNC243.90 3.962 3.683NO.8 UNF363.50 3.606 3.4043/8W167.98.07.9M2.2*0.6 1.75 1.838 1.713M3.0*0.35 2.70 2.721 2.621NO.12 UNC244.50 4.597 4.344NO.10 UNF324.10 4.165 3.9637/16W149.39.49.3M2.3*0.6 1.90 1.979 1.867M3.5*0.35 2.20 3.221 3.1211/4 UNC205.10 5.257 4.979NO.12 UNF284.60 4.7244.4961/2W1210.510.710.5M2.5*0.45 2.10 2.138 2.013M4.0*0.5 3.50 3.599 3.4595/16 UNC18 6.60 6.731 6.4011/4 UNF285.50 5.588 5.3609/16W1212.112.312.0M2.6*0.45 2.20 2.238 2.113M4.5*0.5 4.00 4.099 3.9593/8 UNC168.008.1537.7985/16 UNF246.907.035 6.7825/8W1113.513.713.5M3.0*0.5 2.50 2.599 2.459M5.0*0.5 4.50 4.599 4.4597/16 UNC149.409.5509.1443/8 UNF248.508.6368.3823/4W1016.516.716.5M3.0*0.6 2.40 2.440 2.280M5.5*0.5 5.00 5.099 4.9591/2 UNC1310.8011.02310.3927/16UNF209.9010.0339.7297/8W919.719.519.3M3.5*0.6 2.90 3.010 2.850M6.0*0.75 5.30 5.378 5.1889/16 UNC1212.2012.44611.9891/2UNF2011.5011.60711.3291W822.022.422.0M4.0*0.7 3.30 3.422 3.242M7.0*0.75 6.30 6.378 6.1885/8 UNC1113.6013.86813.3869/16 UNF1812.9013.08112.751 1 1/8W724.825.024.8M4.0*0.75 3.25 3.326 3.106M8.0*1.07.007.153 6.9173/4 UNC1016.5016.84016.3075/8 UNF1814.5014.68114.351 1 1/4W728.028.328.0M4.5*0.75 3.80 3.878 3.688M8.0*0.757.307.3787.1887/8 UNC919.5019.76119.1773/4 UNF1617.5017.67817.323 1 3/8W630.330.530.3M5.0*0.8 4.20 4.334 4.134M9.0*1.08.008.1537.917 1 UNC822.2022.60621.9717/8 UNF1420.5020.67520.270 1 1/2W633.533.833.5M5.0*0.9 4.10 4.170 3.930M9.0*0.758.308.3788.188 1 1/8 UNC725.0025.34924.638 1 UNF1223.2023.57123.114 1 5/8W535.736.035.7M6.0*1.0 5.00 5.153 4.917M10.0*1.258.808.9128.647 1 1/4 UNC728.2028.52427.813 1 1/8 UNF1226.5026.74626.289 1 3/4W539.039.239.0M7.0*1.0 6.00 6.153 5.917M10.0*1.09.009.1538.917 1 3/8 UNC630.8031.11530.353 1 1/4 UNF1229.5029.92129.464 1 7/8W41/241.541.841.5M8.0*1.258.80 6.912 6.647M10.0*1.759.309.3789.188 1 1/2 UNC634.0034.29033.528 1 3/8 UNF1232.8033.09632.6392W4 1/244.745.044.7M9.0*1.257.807.9127.647M10.0*0.59.509.5209.400 1 3/4 UNC539.5039.82738.964 1 1/2 UNF1236.0036.27135.814 M10.0*1.58.508.7768.376M11.0*1.010.0010.1539.9172UNC4 1/245.2045.59334.679M11.0*1.59.509.6769.376M11.0*0.7510.3010.37810.188M12 .0*1.7510.3010.44110.106M12.0*1.510.5010.67610.376M14.0*2. 012.0012.21011.836M12.0*1.2510.8010.91210.647M16.0*2.014.0 014.21013.835M12.0*1.011.0011.15310.917M18.0*2.515.5015.74 415.294M14.0*1.512.5012.67612.376上限下限使用绞刀不使用绞刀M20.0*2.517.517.74417.294M14.0*1.013.0013.15312.917SM1/6-80 1.30 1.34 1.181/16PT28 6.1 6.2 6.244 6.384M22.0*2.519.519.74419.294M15.0*1.513.5013.67613.376S M5/64-64 1.60 1.68 1.471/8PT288.18.28.2498.388M24.0*3.021.021.25220.752M15.0*1.014.0014.15313.917SM3/32-1002.15 2.18 2.051/4PT1910.711.010.96211.174美制粗牙（UNC ）美制细牙（UNF ）2级螺纹内径英制粗牙（W ）螺纹下孔直径下孔径称呼尺寸下孔径称呼尺寸下孔径2级螺纹内径称呼尺寸下孔径公制粗牙（M ）公制细牙（MF ）2级螺纹内径称呼尺寸下孔径称呼尺寸下孔径称呼尺寸下孔径有效螺纹部的最小内径基准位置的最小内径针车牙(SM)规格下孔径下孔径管用螺纹PT(Rc)M27.0*3.024.024.25223.752M16.0*1.514.5014.67614.376SM 3/32-56 1.90 2.03 1.793/8PT1914.214.514.44814.658M30.0*3.526.026.77126.211M 16.0*1.015.0015.15314.917SM1/8-44 2.55 2.73 2.431/2PT1417.618.017.97918.263M33.0*3.529.529.77129.211M 17.0*1.515.5015.67615.376SM1/8-40 2.50 2.68 2.353/4PT1423.023.523.37823.663M36.0*4.032.032.27031.670M 17.0*1.016.0016.15315.917SM9/64-40 2.90 3.08 2.751PT1129.029.529.45829.822M39.0*4.035.035.27034.670M18 .0*2.016.0016.21015.835SM11/64-40 3.70 3.87 3.54 1 1/4PT1137.538.037.97638.339M42.0*4.537.537.79937.129M18.0 *1.516.5016.67616.376SM3/16-32 3.95 4.14 3.73 1 1/2PT1143.444.043.86944.232M45.0*4.540.540.79940.129M18.0*1.017.0017.15316.917SM3/16-28 3.80 4.06 3.582PT1154.955.555.41255.844M20.0*2.018.0018.21017.835SM7/32-32 4.70 4.94 4.53M20.0*1.518.5018.67618.376SM15/64-28 5.00 5.25 4.77M20.0*1.019.0019.15318.917SM1/4-40 5.70 5.86 5.53M22.0*2.020.0020.21019.835SM1/4-28 5.40 5.64 5.17上限下限M22.0*1.520.5020.67620.376SM1/4-24 5.25 5.53 4.98 M1*0.250.900.920.86M22.0*1.021.0021.15320.917M1.1*0.25 1.00 1.020.96M24.0*2.022.0022.21021.835M1.2*0.25 1.10 1.12 1.06M24.0*1.522.5022.67622.376M1.4*0.30 1.25 1.30 1.24M24.0*1.023.0023.15322.917M1.6*0.36 1.45 1.49 1.41M25.0*2.023.0023.21022.835上限下限上限下限上限下限M1.7*0.35 1.55 1.59 1.51M25.0*1.523.5023.67623.376NO.1 -64 1.70 1.73 1.641/16PF28 6.7 6.843 6.5611/16PS28 6.5 6.632 6.490M1.8*0.35 1.65 1.69 1.61M25.0*1.024.0024.15323.917NO.2 -56 2.00 2.04 1.941/8PF288.78.8488.5661/8PS288.58.6378.495M2*0.4 1.801.87 1.78M26.0*1.524.5024.67624.316NO.3 -482.25 2.342.231/4PF1911.711.89011.4451/4PS1911.411.54911.341M2.2*0.45 2.00 2.05 1.96M27.0*2.025.0025.21024.835NO.4 -40 2.55 2.64 2.503/8PF1915.215.39514.9503/8PS1915.015.05414.846M2.3*0.4 2.10 2.17 2.08M27.0*1.525.5025.67625.376NO.5 -40 2.90 2.97 2.831/2PF1419.019.17218.6311/2PS1418.518.77318.489M2.5*0.45 2.30 2.35 2.26M27.0*1.026.0026.15325.917NO.6 -32 3.15 3.25 3.085/8PF1421.021.12820.5873/4PS1424.024.25923.975M2.6*0.45 2.40 2.45 2.36M28.0*2.026.0026.21025.835NO.8 -32 3.80 3.91 3.743/4PF1424.524.65824.1171PS1130.230.47130.111M3*0.5 2.75 2.84 2.73M28.0*1.526.5026.67626.376NO.10 -24 4.35 4.48 4.257/8PF1428.228.41827.877 11/4PS1138.839.13238.772M3.5*0.6 3.20 3.313.18M28.0*1.027.0027.15326.917NO.12 -24 5.00 5.144.911PF1130.530.93130.291 1 1/2PS1144.845.02544.665M4*0.7 3.65 3.77 3.62M30.0*3.027.0027.25226.7521/4 -20 5.75 5.94 5.66 1 1/8PF1135.235.57934.9392PS1156.556.83656.476M4.5*0.75 4.15 4.26 4.09M30.0*2.028.0028.21027.8355/16 -187.307.487.17 1 1/4PF1139.239.59238.952M5*0.8 4.60 4.74 4.57M30.0*1.528.5028.67628.3763/8 -168.809.018.67 1 1/2PF1145.045.48544.845M6.0*1.0 5.50 5.68 5.46M30.0*1.029.0029.15328.9177/16 -1410.3010.5210.13 1 3/4PF1151.051.42850.788M7.0*1.0 6.50 6.68 6.46M32.0*2.030.0030.21029.8351/2 -1311.8012.0711.642PF1157.057.29656.656M8.0*1.257.357.597.32M32.0*1.530.5030.67630.376M9.0*1. 258.408.598.32M33.0*3.030.0030.25229.752M10.0*1.59.259.519. 19M33.0*2.031.0031.21030.833M12.0*1.7511.1011.4311.05M33. 0*1.531.5031.67631.376M14.0*2.013.1013.2512.90M35.0*1.533.5033.67633.376上限下限规格下孔径无屑丝攻公制粗牙(M)管用螺纹PF(G)无屑丝攻美制粗牙（UNC ）规格下孔径下孔径下孔径无屑丝攻美制粗牙（UNF ）规格下孔径称呼尺寸下孔径美制管用螺纹下孔径( )内为英制尺寸NPTNPS称呼尺寸下孔径A 、B 级内螺纹内径管用螺纹PS(Rp)称呼尺寸下孔径A 、B 级内螺纹内径M16.0*2.015.1015.2614.90M36.0*3.033.0033.25232.752NO.0 -80 1.40 1.42 1.35使用绞刀不使用绞刀M18.0*2.516.9017.0616.62M36.0*2.034.0034.21033.835NO.1 -72 1.70 1.74 1.661/16-27 6.10(0.246.25(0.246)6.35(0.250)M20.0*2.518.9019.0718.62M36.0 *1.534.5034.67634.376NO.2 -64 2.00 2.06 1.971/8-278.33(0.328.43(0.332)8.74(0.344)M38.0*1.536.5036.67636.376NO.3 -56 2.30 2.37 2.271/4-1810.72(0.411.13(0.438)11.13(0.438)NO.4 -48 2.60 2.67 2.563/8-1814.27(0.514.27(0.562)14.68(0.578)NO.5 -44 2.90 2.99 2.861/2-1417.48(0.617.86(0.703)18.26(0.719)上限下限NO.6 -40 3.20 3.30 3.163/4-1422.63(0.823.01(0.901)23.42(0.922)W1/16-60 1.40 1.42 1.32NO.8 -36 3.85 3.94 3.781-11 1/228.58(1.128.98(1.144)29.36(1.156)W3/32-48 2.10 2.18 2.04NO.10 -32 4.45 4.57 4.40 1 1/4-11 1/237.31(1.437.69(1.484)38.10(1.500)W1/8-40 2.85 2.93 2.77NO.12 -28 5.05 5.19 4.99 1 1/2-11 1/243.66(1.744.04(1.734)44.45(1.750)W5/32-32 3.55 3.66 3.461/4 -28 5.95 6.06 5.862-11 1/255.58(2.155.96(2.203)56.36(2.219)W3/16-24 4.25 4.36 4.085/16 -247.407.597.36 2 1/2-865.89(2.566.68(2.625)67.46(2.656)W7/32-24 5.05 5.15 4.883/8 -249.009.188.95W1/4-20 5.75 5.86 5.541/2 -2012.1012.2912.01W5/16-187.307.407.03W3/8-168.808.928.51W7/16-1410.3010.429.95W1/2-1211.7511.8911.34 规格下孔径下孔径无屑丝攻英制粗牙(W)NPS 称呼尺寸。

0.783 0.883 0.983 1.183 1.383 1.460 1.583 1.729 1.929 2.001 2.121 2.186 2.621 3.121 3.459 3.959 4.459 4.959 5.188 5.400 6.188 6.400 6.917 7.188 7.400 7.917 8.188 8.647 8.917 9.188 9.400 8.917 10.188 10.376 10.647
1.182 1.474 1.756 2.025 2.271 2.551 2.820 3.404 3.963 4.496 5.360 6.782 8.382 9.729 11.329 12.751 14.351 17.323 20.270 23.114 26.289 29.464 32.639 35.814
0.821 0.921 1.021 1.221 1.421 1.500 1.621 1.785 1.985 2.610 2.221 2.246 2.721 3.221 3.599 4.099 4.599 5.099 5.378 5.550 6.378 6.550 7.153 7.378 7.520 8.153 8.378 8.912 9.153 9.378 9.520 10.153 10.378 10.676 10.912
1.25 1.55 1.85 2.10 2.40 2.70 2.90 3.50 4.10 4.60 5.50 6.90 8.50 9.90 11.50 12.90 14.50 17.50 20.50 23.20 26.50 29.50 32.80 36.00
1.305 1.612 1.912 2.197 2.458 2.740 3.022 3.606 4.165 4.724 5.588 7.035 8.636 10.033 11.607 13.081 14.681 17.678 20.575 23.571 26.746 29.921 33.096 36.271

11.153 11.520 12.676 13.153 13.676 14.153 14.676 15.153 15.676 16.153 16.210 16.676 17.153 18.210 18.676 19.153 20.210 20.676 21.153 22.210 22.676 23.153 23.210 23.676 24.153 24.676 25.210 25.676 26.153 26.210 26.676 27.153 27.152 28.210 28.676 29.153 30.210 30.676 30.252 31.210 31.676 33.676 33.252 34.210 34.676
No 1-64(1.854) No 2-56(2.184) No 3-48(2.515) No 4-40(2.845) No 5-40(3.175) No 6-32(3.505) No 8-32(4.166) No 10-24(4.826) No 12-24(5.486) 1/4 - 20 5/16 - 18 3/8 - 16 7/16 - 14 1/2 - 13 9/16 - 12 5/8 - 11 3/4 - 10 7/8 - 9 1 - 8 1-1/8 - 7 1-1/4 - 7 1-3/8 - 6 1-1/2 - 6 1-3/4 - 5 2 - 4-1/2
公制细螺纹
规格 标准率 2级牙钻孔径 最大 最小
M1.0*0.2 M1.1*0.2 M1.2*0.2 M1.4*0.2 M1.6*0.2 M1.7*0.2 M1.8*0.2 M2.0*0.25 M2.2*0.25 M2.3*0.25 M2.5*0.35 M2.6*0.35 M3.0*0.35 M3.5*0.35 M4.0*0.5 M4.5*0.5 M5.0*0.5 M5.5*0.5 M6.0*0.75 M6.0*0.5 M7.0*0.75 M7.0*0.5 M8.0*1.0 M8.0*0.75 M8.0*0.5 M9.0*1.0 M9.0*0.75 M10*1.25 M10*1.0 M10*0.75 M10*0.5 M11*1.0 M11*0.75 M12*1.50 M12*1.25

M12*1.0 M12*0.5 M14*1.5 M14*1.0 M15*1.5 M15*1.0 M16.1.5 M16*1.0 M17*1.5 M17*1.0 M18*2.0 M18*1.5 M18*1.0 M20*2.0 M20*1.5 M20*1.0 M22*2.0 M22*1.5 M22*1.0 M24*2.0 M24*1.5 M24*1.0 M25*2.0 M25*1.5 M25*1.0 M26*1.5 M27*2.0 M27*1.5 M27*1.0 M28*2.0 M28*1.5 M28*1.0 M30*3.0 M30*2.0 M30*1.5 M30*1.0 M32*2.0 M32*1.5 M33*1.0 M33*2.0 M33*1.5 M35*1.5 M36*3.0 M36*2.0 M36*1.5
10.917 11.400 12.376 12.917 13.376 13.917 14.376 14.917 15.376 15.917 15.835 16.976 16.917 17.835 18.376 18.917 19.835 20.376 20.917 21.835 22.376 22.917 22.835 23.376 23.917 24.376 24.835 25.376 25.917 25.835 26.376 26.917 26.752 27.835 28.376 28.917 29.835 30.376 29.752 30.835 31.376 33.376 32.752 33.835 34.376
1.25 1.55 1.85 2.10 2.40 2.70 2.90 3.50 4.10 4.60 5.50 6.90 8.50 9.90 11.50 12.90 14.50 17.50 20.50 23.20 26.50 29.50 32.80 36.00

切削丝攻公制粗牙(M)（通用）公制细牙(MF)1/2规格下孔径下孔径(%)规格下孔径下孔径(%) 60%100%60%100%M1.0 X0.250.750.840.73M1 X0.20.80.870.78 M1.1 X0.250.850.940.83M1.1 X0.20.90.970.88 M1.2 X0.250.95 1.040.93M1.2 X0.21 1.070.98 M1.4 X0.3 1.1 1.21 1.08M1.4 X0.2 1.2 1.27 1.18 M1.6 X0.35 1.25 1.37 1.22M1.6 X0.2 1.4 1.47 1.38 M1.7 X0.35 1.35 1.47 1.32M1.8 X0.2 1.6 1.67 1.58 M1.8 X0.35 1.45 1.57 1.42M2 X0.25 1.75 1.84 1.73 M2 X0.4 1.6 1.74 1.57M2.2 X0.25 1.95 2.07 1.93 M2.2 X0.45 1.75 1.01 1.71M2.5 X0.35 2.15 2.27 2.12 M2.3 X0.4 1.9 2.04 1.87M3 X0.35 2.65 2.77 2.62 M2.5 X0.45 2.05 2.21 2.01M3.5 X0.35 3.15 3.27 3.12 M2.6 X0.45 2.15 2.31 2.11M4 X0.5 3.5 3.68 3.46 M3 X0.5 2.5 2.68 2.46M4.5 X0.54 4.18 3.96 M3 X0.6 2.4 2.61 2.35M5 X0.5 4.5 4.68 4.46 M3.5 X0.6 2.9 3.11 2.85M5.5 X0.55 5.18 4.96 M4 X0.7 3.3 3.55 3.24M6 X0.5 5.5 5.68 5.46 M4 X0.75 3.25 3.51 3.19M6 X0.75 5.25 5.51 5.19 M4.5 X.75 3.75 4.01 3.69M7 X0.75 6.25 6.51 6.19 M5 X0.8 4.2 4.48 4.13M8 X0.757.257.517.19 M5 X0.9 4.1 4.7 4.03M8 X1.077.35 6.92 M6 X0.105 5.35 4.92M9 X1.088.357.92 M7 X0.106 6.35 5.92M10 X0.759.259.519.19 M8 X1.25 6.87.19 6.65M10 X1.099.358.92 M9 X1.257.88.197.65M10 X1.258.759.198.65 M10 X1.58.59.038.38M11 X1.01010.359.92 M11 X1.59.510.039.38M12 X0.7511.2511.5111.19 M12 X1.7510.210.8610.11M12 X1.01111.3510.92 M14 X2.01212.711.83M12 X1.2510.7511.1910.65 M16 X2.01414.713.83M12 X1.510.511.0310.38 M18 X2.515.516.3815.29M14 X1.01313.3512.92 M20 X2.517.518.3817.29M14 X1.2512.7513.1912.65 M22 X2.519.520.3819.29M14 X1.512.513.0312.38 M24 X3.02122.0520.75M15 X1.01414.3513.92 M27 X3.02425.0523.75M15 X1.2513.7514.1913.65 M30 X3.526.527.7326.21M15 X1.513.514.0313.38 M33 X3.529.530.7329.21M16 X1.01515.3514.92 M36 X4.03233.431.67M16 X1.2514.7515.1914.65 M39 X4.03536.434.67M16 X1.514.515.0314.38 M42 X4.537.539.0837.13M18 X1.01717.3516.92 M45 X4.540.542.0840.13M18 X1.2516.7517.1916.65 M48 X5.04344.7542.59M18 X1.516.517.0316.38 M52 X5.04748.7546.59M18 X2.01616.715.83 M56 X5.550.552.4350.05M20 X1.01919.3518.92 M60 X5.554.556.4354.05M20 X1.2518.7519.1918.65 M64 X65860.157.5M20 X1.518.519.0318.38 M68 X66264.161.5M20 X2.01818.717.83 M72 X66668.165.5M22 X1.02121.3520.92 M76 X67072.169.5M22 X1.2520.7521.1920.65M22 X1.520.521.0320.38公制细牙公制细牙(MF)2/2(MF)2/2挤压丝攻公制粗牙(M)M22 X2.02020.0719.83规格下孔径下孔径(%)M24 X1.02323.3522.92 60%100%M24 X1.2522.7523.1922.65M1 X0.250.90.920.86M24 X1.522.523.0322.38M1.1 X0.251 1.020.96M24 X2.02222.721.83M1.2 X0.25 1.1 1.12 1.06M25 X1.02424.1923.92M1.4 X0.3 1.25 1.3 1.24M25 X1.523.524.0323.38M1.6 X0.35 1.45 1.49 1.41M25 X2.02323.722.83M1.7 X0.35 1.55 1.59 1.51M26 X1.524.525.0324.38M1.8 X0.35 1.65 1.69 1.61M27 X1.02626.3525.92M2 X0.4 1.8 1.87 1.78M27 X1.525.526.0325.38M2.2 X0.452 2.05 1.96M27 X2.02525.724.83M2.3 X0.4 2.1 2.17 2.08M28 X1.526.527.0326.38M2.5 X0.45 2.3 2.35 2.26M28 X2.02626.725.83M2.6 X0.45 2.4 2.45 2.36M30 X1.02929.3528.92M3 X0.5 2.75 2.84 2.73M30 X1.528.529.0328.38M3.5 X0.6 3.2 3.31 3.18M30 X2.02828.727.83M4 X0.7 3.65 3.77 3.62M32 X1.530.531.0330.38M4.5 X0.75 4.15 4.26 4.09M33 X1.531.532.0331.38M5 X0.8 4.6 4.74 4.57M33 X2.03131.730.83 1 1 M6 X1.0 5.5 5.68 5.46M33 X3.03031.529.75 1 1 M7 X1.0 6.5 6.68 6.46M35 X1.533.534.0333.38M8 X1.257.357.597.32M36 X1.534.535.0334.38M9 X1.258.48.598.32M36 X2.03434.733.83M10 X1.59.259.519.19M36 X3.03334.0532.75M12 X1.7511.111.4311.05M38 X1.536.537.0336.38M39 X1.537.538.0337.38护套丝攻(M)M39 X2.03737.736.83规格下孔径下孔径(%)M39 X3.03637.0535.75最小最大M40 X1.538.539.0338.38M3 X0.5 3.1 3.11 3.22M40 X2.03838.737.83 M4 X0.7 4.2 4.15 4.29M40 X3.03738.0536.75 M5 X0.8 5.2 5.17 5.33M42 X1.540.541.0340.38 M6 X1.0 6.3 6.22 6.41M42 X2.04040.739.83 M8 X1.258.48.278.48M42 X3.03940.538.75 M10 X1.510.410.3210.56M42 X4.03840.737.66 M12 X1.7512.512.3812.64M45 X1.543.544.0343.38 M14 X2.014.514.4314.73M45 X2.04343.742.83 M16 X2.016.516.4316.73M45 X3.04243.0541.75 M18 X2.518.718.5418.9M45 X4.04142.440.67 M20 X2.520.720.5420.9M48 X2.04646.745.83M48 X3.04546.0544.75M48 X4.04445.443.67M50 X1.548.549.0348.38M50 X2.04848.747.83M50 X3.04748.0546.75M52 X1.550.551.0350.38M52 X2.05050.749.83M52 X3.04950.0548.75英制粗牙(W)美制粗牙(UNC)规格下孔径下孔径(%)规格下孔径下孔径(%) 60%100%60%100%W1/16 -60 1.2 1.26 1.05Nr.1 -64 1.5 1.6 1.42 W3/32 -48 1.8 1.97 1.7Nr.2 -56 1.8 1.89 1.69 W1/8 -40 2.6 2.69 2.36Nr.3 -48 2.1 2.17 1.94 W5/32 -32 3.1 3.36 2.95Nr.4 -40 2.3 2.43 2.16 W3/16 -24 3.6 3.95 3.41Nr.5 -40 2.6 2.76 2.49 W7/32 -24 4.5 4.74 4.2Nr.6 -32 2.75 2.99 2.65 W1/4 -20 5.1 5.37 4.72Nr.8 -32 3.5 3.65 3.31 W5/16 -18 6.5 6.85 6.13Nr.10 -24 3.8 4.14 3.68 W3/8 -167.98.317.49Nr.12 -24 4.5 4.8 4.34 W7/16 -149.39.728.791/4 -20 5.1 5.53 4.98 W1/2 -1210.511.079.995/16 -18 6.57.02 6.41 W9/16 -121212.6611.583/8 -167.98.497.81 W5/8 -1113.514.112.927/16 -149.39.939.15 W3/4 -1016.517.115.81/2 -1310.811.4310.58 W7/8 -919.2520.0618.619/16 -1212.212.9112 W12222.9621.335/8 -1113.514.3813.38 W 1 1/824.7525.7923.933/4 -1016.517.416.3 W 1 1/427.7528.9627.17/8 -919.520.3919.17 W 1 3/830.231.6729.5 1 -822.2523.3421.96 W 1 1/233.534.8532.68 1 1/4 -72829.3927.82 W 1 5/835.537.3734.77 1 3/8 -63132.1830.34 W 1 3/438.540.5537.94 1 1/2 -634.535.3533.52 W 1 7/841.543.2940.4 1 3/4 -53941.1538.95 W 244.546.4643.57 2 -4.54547.1344.69无屑丝攻英制粗牙(W)无屑丝攻美制粗牙(UNC)规格下孔径下孔径(%)规格下孔径下孔径(%) 60%100%60%100%W1/16 -60 1.4 1.42 1.32Nr.1 -64 1.7 1.73 1.64 W3/32 -48 2.1 2.18 2.04Nr.2 -562 2.04 1.94 W1/8 -40 2.85 2.93 2.77Nr.3 -48 2.25 2.34 2.23 W5/32 -32 3.55 3.66 3.46Nr.4 -40 2.55 2.64 2.5 W3/16 -24 4.25 4.36 4.08Nr.5 -40 2.9 2.97 2.83 W 7/32 -24 5.05 5.15 4.88Nr.6 -32 3.15 3.25 3.08 W1/4 -20 5.75 5.86 5.54Nr.8 -32 3.8 3.91 3.7 W5/16 -187.37.47.03Nr.10 -24 4.35 4.48 4.25 W3/8 -168.88.928.51Nr.12 -245 5.14 4.91 W7/16 -1410.310.429.951/4 -20 5.75 5.94 5.66 W1/2 -1211.7511.8911.345/16 -187.37.487.173/8 -168.89.018.67英制管牙7/16 -1410.310.5210.13规格PT(Rc)PS(Pp)PF(G)1/2 -1311.812.0711.64下孔径下孔径下孔径1/16 -28 6.3 6.5 6.7护套丝攻(UNC)1/8 -28 8.38.68.7规格下孔径下孔径(%)1/4 -191111.511.7最小最大3/8 -1914.51515.25Nr.4 -40 3.1 2.98 3.18 1/2 -1418.118.519Nr.6 -32 3.8 3.68 3.885/8 -1421Nr.8 -32 4.4 4.34 4.52 3/4 -1423.52424.5Nr.10 -24 5.2 5.05 5.28 7/8 -14281/4 -20 6.7 6.63 6.87 1 -1129.630.2530.55/16 -188.48.248.49 1 1/8 -1135.53/8 -16109.8710.13 1 1/4 -1138.13939.57/16 -1411.611.5111.78 1 1/2 -114444.9451/2 -1313.213.1213.391 3/4 -11519/16 -1214.914.7515.032 -1155.656.6575/8 -1116.516.3816.673/4 -1019.819.619.91美制管牙规格NPT NPS钢管牙(Pg)下孔径下孔径规格下孔径下孔径(%)1/16 -27 6.2 6.3560%100% 1/8 -278.58.75Pg7 -2011.411.7711.29 1/4 -181111.15Pg9 -181414.3913.85 3/8 -1814.514.7Pg11 -1817.417.7917.25 1/2 -141818.15Pg13.5 -1819.119.5919.05 3/4 -142323.4Pg16 -1821.321.6921.15 1 -11 1/22929.4Pg21 -1626.927.3926.79 1 1/4 -11 1/23838.1Pg29 -1635.636.0935.491 1/2 -11 1/24444.45Pg36 -1645.646.0945.492 -11 1/25656.4Pg42 -1652.653.0952.49美制细牙(UNF)规格下孔径下孔径(%) 60%100%Nr.0 -80 1.3 1.32 1.18 Nr.1 -72 1.6 1.62 1.47 Nr.2 -64 1.9 1.93 1.75 Nr.3 -56 2.1 2.22 2.02 Nr.4 -48 2.4 2.5 2.27 Nr.5 -44 2.7 2.8 2.55 Nr.6 -403 3.09 2.82 Nr.8 -36 3.5 3.71 3.4 Nr.10 -32 4.1 4.31 3.97 Nr.12 -28 4.7 4.9 4.5 1/4 -28 5.5 5.76 5.37 5/16 -24 6.97.25 6.79 3/8 -248.58.848.38 7/16 -209.910.299.74 1/2 -2011.511.8811.33 9/16 -1812.913.3712.76 5/8 -1814.514.9614.35 3/ 4 -1617.518.0217.33 7/8 -1420.2521.0520.26 1 -1223.2524.0323.11 1 1/8 -1226.527.226.28 1 1/4 -1229.530.3829.46 1 3/8 -123333.3532.63 1 1/2 -123636.7335.81无屑丝攻美制细牙(UNF)规格下孔径下孔径(%) 60%100%Nr.0 -80 1.4 1.42 1.35 Nr.1 -72 1.7 1.74 1.66 Nr.2 -642 2.06 1.97 Nr.3 -56 2.3 2.37 2.27 Nr.4 -48 2.6 2.67 2.56 Nr.5 -44 2.7 2.8 2.55 Nr.6 -40 3.2 3.3 3.16 Nr.8 -36 3.85 3.94 3.78 Nr.10 -32 4.45 4.57 4.4 Nr.12 -28 5.05 5.19 4.98 1/4 -28 5.95 6.06 5.86 5/16 -247.47.597.36 3/8 -2499.188.95 1/2 -2012.112.2912.01套丝攻(UNF)规格下孔径下孔径(%)最小最大Nr.4 -483 2.96 3.12 Nr.6 -40 3.7 3.64 3.82Nr.8 -36 4.4 4.32 4.5 Nr.10 -32 5.15 5.18 1/4 -28 6.6 6.55 6.72 5/16 -248.28.178.35 3/8 -249.89.759.93 7/16 -2011.511.3911.59 1/2 -2013.112.9813.18 9/16 -1814.714.5914.8 5/8 -1816.316.1816.39 3/4 -1619.519.3919.61美制号数牙之外径换算番数英寸公尺NR.00.06 1.524NR.10.073 1.854NR.20.086 2.184NR.30.099 2.515NR.40.112 2.845NR.50.125 3.175NR.60.138 3.505NR.80.164 4.166NR.100.19 4.826NR.120.216 5.486。

美制粗螺纹
规格(UNC) 标准径 2级牙钻孔径 最大 最小
美制细螺纹
规格(UNF) 标准径 2级牙钻孔径 最大 最小
No 0-80(1.524) No 1-72(1.854) No 2-64(2.184) No 3-58(2.515) No 4-48(2.845) No 5-44(3.175) No 6-40(3.506) No 8-36(4.166) No 10-32(4.826) No 12-28(5.846) 1/4 - 28 5/16 - 24 3/8 - 24 7/16 - 20 1/2 - 20 9/16 - 18 5/8 - 18 3/4 - 16 7/8 - 14 1 - 12 1-1/8 - 12 1-1/4 - 12 1-3/8 - 12 1-1/2 - 12
0.75 0.85 0.95 1.00 1.25 1.35 1.45 1.60 1.75 1.90 2.10 2.20 2.50 2.40 2.90 3.30 3.25 3.80 4.20 4.10 5.00 6.00 6.80 7.80 8.50 9.50 10.30 12.00 14.00 15.50 17.50 19.50 21.00 24.00 26.50
11.00 11.50 12.50 13.00 13.50 14.00 14.50 15.00 15.50 16.00 16.00 16.50 17.00 18.00 18.50 19.00 20.00 20.50 21.00 22.00 22.50 23.00 23.00 23.50 24.00 24.50 25.00 25.50 26.00 26.00 26.50 27.00 27.00 28.00 28.50 29.00 30.00 30.50 30.00 31.00 31.50 33.50 33.00 34.00 34.50

标准径
0.80 0.90 1.00 1.20 1.40 1.45 1.60 1.75 1.95 2.05 2.20 2.20 2.70 3.20 3.50 4.00 4.50 5.00 5.30 5.50 6.30 6.50 7.00 7.30 7.50 8.00 8.30 8.80 9.00 9.30 9.50 10.00 10.30 10.50 10.80
美制细螺纹
规格 (UNF)
标准径
(螺丝牙外径)
No.08N0o(.11.-524) 7N2o(.12.-854) 6N4o(.23.-184) 5N6o(.24.-515) 4N8o(.25.-845) 4N4o(.36.-175) 4N0o(.38.-505) 3N6o(.41.01-66) 3N2o(.41.28-26) 218/(45.84-6) 258/16 234/8 274/16 210/2 290/16 158/8 138/4 176/8 114 112-1/8 112-1/4 112-3/8 112-1/2 12
1.25 1.55 1.85 2.10 2.40 2.70 2.90 3.50 4.10 4.60 5.50 6.90 8.50 9.90 11.50 12.90 14.50 17.50 20.50 23.20 26.50 29.50 32.80 36.0
2级牙钻孔径 最大 最小
1.305 1.182 1.612 1.474 1.912 1.756 2.197 2.025 2.458 2.271 2.740 2.551 3.022 2.820 3.606 3.404 4.165 3.963 4.724 4.496 5.588 5.360 7.035 6.782 8.636 8.382 10.033 9.729 11.607 11.329 13.081 12.751 14.681 14.351 17.678 17.323 20.675 20.270 23.571 23.114 26.746 26.289 29.921 29.464 33.096 32.639 36.271 35.814

使用绞刀时 不用绞刀时
注：无槽沟死攻之钻孔经，在上表所列之 数值，由于被加工材料材质、硬度、形状 、尺寸等影响，多少会有秘变动，因此于 参考上表同时，亦请增减若干。
6.10 8.10 10.70 14.20 17.60 23.00 29.00 37.50 43.40 54.90
6.20 8.20 11.00 14.50 18.00 23.50 29.50 38.00 44.00 55.50
公 制 粗 螺 纹
规格
M1.0X0.25 M1.1X0.25 M1.2X0.25 M1.4X0.3 M1.6X0.35 M1.7X0.35 M1.8X0.35 M2.0X0.4 M2.2X0.45 M2.3X0.4 M2.5X0.45 M2.6X0.45 M3.0X0.5 M3.0X0.6 M3.5X0.6 M4.0X0.7 M4.0X0.75 M4.5X0.75 M5.0X0.8 M5.0X0.9 M6.0X1.0 M7.0X1.0 M8.0X1.25 M9.0X1.25 M10X1.5 M11X1.5 M12X1.75 M14X2.0 M16X2.0 M18X2.5 M20X2.5 M22X2.5 M24X3.0 M27X3.0 M30X3.5
6.244 8.249 10.962 14.448 17.979 23.379 29.459 37.976 43.869 55.412
6.364 8.388 11.174 14.658 18.263 23.663 29.822 38.339 44.232 55.844
美 制 粗 螺 纹
规格 （UNF）
2级牙钻孔径 最大 最小 0.821 0.783 0.921 0.883 1.021 0.983 1.221 1.183 1.421 1.383 1.500 1.460 1.621 1.583 1.785 1.729 1.985 1.929 2.061 2.001 2.221 2.121 2.246 2.186 2.721 2.621 2.221 2.121 3.599 2.459 4.099 3.959 4.599 4.459 5.099 4.959 5.378 5.188 5.550 5.400 6.378 6.188 6.550 6.400 7.153 6.917 7.378 7.188 7.520 7.400 8.153 7.917 8.378 8.188 8.912 8.647 9.153 8.917 9.378 9.188 9.520 9.400 10.153 9.917 10.378 10.188 10.676 10.376 10.912 10.647 11.153 10.917 11.520 11.400 12.676 12.376 13.153 12.917

螺丝攻牙钻孔径和滚丝径对照表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M1.0×0.25 0.75 0.785 0.729NO.1-64(1.854) 1.55 1.582 1.425M1.1×0.25 0.85 0.885 0.829NO.2-56(2.184) 1.80 1.871 1.695M1.2×0.25 0.95 0.985 0.985NO.3-48(2.515) 2.10 2.146 1.941M1.4×0.3 1.10 1.142 1.075NO.4-40(2.845) 2.30 2.385 2.157M1.6×0.35 1.25 1.321 1.221NO.5-40(3.175) 2.60 2.697 2.487M1.7×0.35 1.35 1.421 1.321NO.6-32(3.505) 2.80 2.895 2.642M1.8×0.35 1.45 1.521 1.421NO8-32(4.166) 3.40 3.53 3.302M2.0×0.4 1.60 1.679 1.567NO.10-24(4.826) 3.90 3.962 3.683M2.2×0.45 1.75 1.838 1.713NO.12-24(5.486) 4.50 4.597 4.344M2.3×0.4 1.90 1.979 1.867 1/4-20 5.10 5.257 4.979M2.5×0.45 2.10 2.138 2.013 5/16-18 6.60 6.731 6.401M2.6×0.45 2.20 2.238 2.113 3/8-16 8.00 8.153 7.798M3.0×0.5 2.50 2.599 2.459 7/16-14 9.40 9.55 9.144M3.0×0.6 2.40 2.440 2.280 1/2-13 10.80 11.023 10.592M3.5×0.6 2.90 3.010 2.850 9/16-12 12.20 12.446 11.989M4.0×0.7 3.30 3.422 3.242 5/8-11 13.60 12.868 13.386M4.0×0.75 3.25 3.326 3.106 3/4-10 16.50 18.840 16.307M4.5×0.75 3.80 3.878 3.688 7/8-9 19.50 19.761 19.177M5.0×0.8 4.20 4.334 4.134 1 22.2022.606 21.971M5.0×0.9 4.10 4.170 3.930 1-1/8-7 25.00 25.349 24.638M6.0×1.0 5.00 5.153 4.917 1-1/4-7 28.20 28.524 27.813M7.0×1.0 6.00 6.153 5.917 1-3/8-6 30.80 31.115 30.353M8.0×1.25 6.80 6.912 6.647 1-1/2-6 34.00 34.290 33.528M9.0×1.25 7.80 7.912 7.647 1-3/4-5 39.50 39.827 38.964M10×1.5 8.50 8.676 8.376 2-4-1/2 45.20 45.593 44.679M11×1.5 9.50 9.676 9.376M12×1.75 10.30 10.441 10.106M14×2.0 12.00 12.210 11.835M16×2.0 14.00 14.210 13.835M18×2.5 15.50 15.744 15.294M20×2.5 17.50 17.744 17.294M22×2.5 19.50 19.744 19.294M24×3.0 21.00 21.252 20.752M27×3.0 24.00 24.252 23.752M30×3.5 26.50 26.771 26.211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M1.0×0.2 0.80 0.821 0.783 NO.0-80(1.524) 1.25 1.305 1.182M1.1×0.2 0.90 0.921 0.883 NO.1-72(1.854) 1.55 1.612 1.474M1.2×0.2 1.00 1.021 0.983 NO.2-64(2.184) 1.85 1.912 1.756M1.4×0.2 1.20 1.221 1.183 NO.3-56(2.515) 2.10 2.197 2.025M1.6×0.2 1.40 1.421 1.383 NO.4-48(2.845) 2.40 2.458 2.271M1.7×0.2 1.45 1.500 1.460NO.5-44(3.175) 2.70 2.740 2.551M1.8×0.2 1.60 1.621 1.583NO.6-40(3.505) 2.90 3.022 2.820M2.0×0.25 1.75 1.785 1.729NO.8-36(4.166) 3.50 3.606 3.404M2.2×0.25 1.95 1.985 1.929NO.10-32(4.826) 4.10 4.165 3.963M2.3×0.25 2.05 2.061 2.001NO.12-28(5.846) 4.60 4.724 4.496M2.5×0.35 2.20 2.221 2.121 1/4-28 5.50 5.588 5.360M2.6×0.35 2.20 2.246 2.186 5/16-24 6.90 7.035 6.782M3.0×0.35 2.70 2.721 2.621 3/8-24 8.50 8.636 8.382M3.5×0.35 3.20 3.221 3.121 7/16-20 9.90 10.033 9.729M4.0×0.5 3.50 3.599 3.459 1/2-20 11.50 11.607 11.329M4.5×0.5 4.00 4.099 3.959 9/16-18 12.90 13.081 12.751M5.0×0.5 4.50 4.599 4.459 5/8-18 14.50 14.681 14.351M5.5×0.5 5.00 5.099 4.959 3/4-16 17.50 17.678 17.323M6.0×0.75 5.30 5.378 5.188 7/8-14 20.50 20.675 20.270M6.0×0.5 5.50 5.550 5.400 1-12 23.20 23.571 23.114M7.0×0.75 6.30 6.378 6.188 1-1/8-12 26.50 26.746 26.289M7.0×0.5 6.50 6.550 6.400 1-1/4-1229.50 29.921 29.464M8.0×1.0 7.00 7.153 6.917 1-3/8-12 32.80 33.096 32.639M8.0×0.75 7.30 7.378 7.188 1-1/2-12 36.00 36.271 35.814M8.0×0.5 7.50 7.520 7.400M9.0×1.0 8.00 8.153 7.917M9.0×0.75 8.30 8.378 8.188M10×1.25 8.80 8.912 8.647M10×1.0 9.00 9.153 8.917M10×0.75 9.30 9.378 9.188M10×0.5 9.50 9.520 9.400M11×1.0 10.00 10.153 9.917M11×0.75 10.30 10.378 10.188M12×1.5 10.50 10.676 10.376M12×1.25 10.80 10.912 10.647M12×0.5 11.50 11.520 11.400 M14×1.5 12.50 12.676 12.376 M14×1.0 13.00 13.153 12.917 M15×1.5 13.50 13.676 13.376 M15×1.0 14.00 14.153 13.917 M16×1.5 14.50 14.676 14.376 M16×1.0 15.00 15.153 14.917 M17×1.5 15.50 15.676 15.376 M17×1.0 16.00 16.153 15.917 M18×2.0 16.00 16.210 15.835 M18×1.5 16.50 16.676 16.376 M18×1.0 17.00 17.153 16.917 M20×2.0 18.00 18.210 17.835 M20×1.5 18.50 18.676 18.376 M20×1.0 19.00 19.153 18.917 M22×2.0 20.00 20.210 19.835 M22×1.5 20.50 20.676 20.376 M22×1.0 21.00 21.153 20.917M24×1.5 22.50 22.676 22.376 M24×1.0 23.00 23.153 22.917 M25×2.0 23.00 23.210 22.835 M25×1.5 23.50 23.676 23.376 M25×1.0 24.00 24.153 23.917 M26×1.5 24.50 24.676 24.376 M27×2.0 25.00 25.210 24.835 M27×1.5 25.50 25.676 25.376 M27×1.0 26.00 26.153 25.917 M28×2.0 26.00 26.210 25.835 M28×1.5 26.50 26.676 26.376 M28×1.0 27.00 27.153 26.917 M30×3.0 27.00 27.252 26.752 M30×2.0 28.00 28.210 27.835 M30×1.5 28.50 28.676 28.376 M30×1.0 29.00 29.153 28.917 M32×2.0 30.00 30.210 29.835 M32×1.5 30.50 30.676 30.376M33×3.0 30.00 30.252 29.752M33×2.0 31.00 31.210 30.835M33×1.5 31.50 31.676 31.376M35×1.5 33.50 33.676 33.376M36×3.0 33.00 33.252 32.752M36×2.0 34.00 34.210 33.835M36×1.5 34.50 34.676 34.376螺丝攻牙钻孔径和滚丝径对照表公制挤压丝攻钻孔径美制挤压丝攻钻孔径规格精度等级规格（UNC）精度等级G4-G6 G7-G8 G9 G4-G6 G7-G8 G9M1.0×0.25 0.86 0.88 －NO.2-56UNC 1.94 －－M1.1×0.25 0.96 0.98 －NO.3-48 2.23 －－M1.2×0.25 1.06 1.08 －NO.4-40 2.50 －－M1.4×0.3 1.24 1.25 －NO.5-40 2.83 －－M1.6×0.35 1.41 1.43 －NO.6-32 3.07 －－－M1.8×0.35 1.61 1.63 －NO.10-24 4.24 4.3 －M2.0×0.4 1.78 1.80 －NO.12-24 4.90 4.96 －M2.2×0.45 1.95 1.98 －1/4-20 －5.72 －M2.3×0.4 2.08 2.10 －5/16-18 －7.24 －M2.5×0.45 2.25 2.28 －3/8-16 －8.74 8.81 M2.6×0.45 2.35 2.38 －7/16-14 －10.20 10.30M3.0×0.5 2.73 2.75 －1/2-13 －11.27 11.82M3.5×0.6 3.17 3.20 －NO.2-64UNF 1.97－－M4.0×0.7 3.62 3.65 3.69 NO.3-56 2.27 －－M5.0×0.8 4.56 4.60 4.64 NO.4-48 2.56 －－－M7.0×1.0 6.45 6.50 6.55 NO.6-40 3.16 －－M8.0×1.25 7.31 7.38 7.44 NO.8-36 3.78 －－M10×1.5 9.18 9.25 9.32 NO.10-32 4.394.43 －M10×1.25 9.31 9.38 9.44 NO.12-28 4.99 5.04 －M12×1.75 11.04 11.12 11.21 1/4-28 5.85 5.90 －M12×1.25 11.31 11.38 11.44 5/16-24 7.36 7.41 －3/8-24 －9.00 －7/16-20 －10.48 10.541/2-20 －12.07 12.13美制特细螺纹英制电器螺纹规格标准径2级牙钻孔径规格钻孔径最大最小NO.12-32 4.70 4.826 4.623 2BA 4.0-4.2 1/4 -32 5.60 5.690 5.486 3BA5/16 -32 7.10 7.264 7.087 4BA 3.0-3.2 3/8 -32 8.70 8.865 8.661 5BA 2.7-2.8 7/16 -28 10.20 10.338 10.135 6BA 2.4-2.51/2 -28 11.80 11.938 11.7099/16 -24 13.20 13.386 13.1325/8 -24 14.80 14.986 14.7323/4 -20 17.80 17.958 17.6787/8 -20 21.00 21.133 20.8531 -20 24.00 24.308 24.028螺丝攻牙钻孔径和滚丝径对照表英制螺纹公制螺纹针车用螺纹规格(UNEF) 钻孔径规格滚丝径规格滚丝径硬材软材W 1/8 - 40 2.65 2.60 M3×0.5 2.63-2.60SM1/8-40 2.735-2.688W 5/32 - 32 3.25 3.20 M3.0×0.6 2.56-2.53 SM1/8-44 2.769-2.722W 3/16 - 24 3.75 3.70 M3.5×0.6 3.06-3.03 SM9/64-40 3.128-3.083W 1/4 - 20 5.10 5.00 M4.0×0.7 3.49-3.45 SM11/64-40 3.855-3.805W 5/16 - 18 6.60 6.50 M4.0×0.75 3.45-3.41 SM3/16-32 4.205-4.155W 3/8 - 16 8.00 7.90 M4.5×0.75 3.96-3.92 SM3/16-28 4.143-4.093W 7/16 - 14 9.40 9.30 M5.0×0.8 4.43-4.38 SM7/32-32 5.003-4.955W 1/2 - 12 10.70 10.50 M5.0×0.9 4.36-4.31 SM15/64-28 5.325-5.570W 9/16 - 12 12.30 12.00 M6.0×1.05.30-5.25 SM1/4-40 5.890-5.735W 5/8 - 11 13.70 13.50 M7.0×1.0 6.30-6.25 SM1/4-28 5.721-5.366W 3/4 - 10 16.70 16.50 M8.0×1.0 7.28-7.23 SM9/32-28 6.508-6.648W 7/8 - 9 19.50 19.30 M8.0×1.25 7.12-7.07 SM11/32-28 8.092-8.432W1 - 8 22.40 22.00 SM3/8-288.880-8.015W 1-1/8 - 7 25.00 24.80 SM7/16-28 10.466-10.401W 1 - 1/4 - 7 28.30 28.00 SM7/16-16 10.037-9.967SM1/2-20 11.819-11.749SM9/26-20 13.400-13.425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绞刀时不用绞刀时NPT NPS 使用绞刀时不用绞刀时PS 1/16 - 28 6.50 6.632 6.490 PT 1/16 - 28 6.10 6.20 6.244 6.384 1/16 - 27 6.10 6.25 6.35PS 1/8 - 28 8.50 8.637 8.495 PT 1/8 - 28 8.10 8.20 8.249 8.388 1/8 - 27 8.33 8.43 8.74PS 1/4 - 19 11.40 11.549 11.341 PT 1/4 - 19 10.70 11.00 10.962 11.174 1/4 - 18 10.72 11.13 11.13PS 3/8 - 19 15.00 15.054 14.846 PT 3/8 - 19 14.20 14.50 14.448 14.658 3/8 - 18 14.27 14.27 14.68PS 1/2 - 14 18.50 18.773 18.489 PT 1/2 - 14 17.60 18.00 17.979 18.263 1/2 - 14 17.48 17.86 18.26PS 3/4 -14 24.00 24.259 23.975 PT 3/4 - 14 23.00 23.50 23.378 23.663 3/4 - 14 22.63 23.01 23.42PS 1 - 11 30.20 30.471 30.111 PT 1- 11 29.00 29.50 29.459 29.822 1 - 11-1/2 28.58 28.98 29.36PS 1-1/4 - 11 38.80 39.132 38.772 PT 1-1/4 - 11 37.50 38.00 37.976 38.3391-1/4-11-1/2 37.31 37.69 38.10PS 1-1/2 - 11 44.80 45.025 44.665 PT 1-1/2 - 11 43.40 44.00 43.869 44.2321-1/2-11-1/2 43.66 44.04 44.45PS 2 - 11 56.50 56.836 56.476 PT 2 - 11 54.90 55.50 55.412 55.844 2 - 11 - 1/2 55.58 55.96 56.36。

最大最小最大最小G4-G6G7-G8G9G4-G6G7-G8硬 材软 材M1.0*0.250.750.7850.729M12*1.011.0011.15310.917M1.0*0.250.860.88No.2-56UNC 1.94 2.65 2.60M1.1*0.250.850.8850.829M12*0.511.5011.52011.400M1.1*0.250.960.98No.3-48 2.23 3.25 3.20M1.2*0.250.950.9850.929M14*1.512.5012.67612.376M1.2*0.25 1.06 1.08No.4-40 2.50 3.75 3.70M1.4*0.31.10 1.142 1.075M14*1.013.0013.15312.917M1.4*0.3 1.24 1.25No.5-40 2.83 5.10 5.00M1.6*0.351.25 1.321 1.221M15*1.513.5013.67613.376M1.6*0.35 1.41 1.43No.6-32 3.07 6.60 6.50M1.7*0.351.35 1.421 1.321M15*1.014.0014.15313.917M1.7*0.35 1.51 1.53No.8-32 3.73 3.778.007.90M1.8*0.351.45 1.521 1.421M16*1.514.5014.67614.376M1.8*0.35 1.61 1.63No.10-24 4.24 4.309.409.30M2.0*0.41.60 1.679 1.567M16*1.015.0015.15314.917M2*0.4 1.78 1.80No.12-24 4.90 4.9610.7010.50M2.2*0.451.75 1.838 1.713M17*1.515.5015.67615.376M2.2*0.45 1.95 1.981/4 -20 5.7212.3012.00M2.3*0.41.90 1.979 1.867M17*1.016.0016.15315.917M2.3*0.4 2.08 2.105/16 -187.2413.7013.50M2.5*0.452.10 2.138 2.013M18*2.016.0016.21015.835M2.5*0.45 2.25 2.283/8 -168.7416.7016.50M2.6*0.452.20 2.238 2.113M18*1.516.5016.67616.376M2.6*0.45 2.35 2.387/16 -1410.2019.5019.30M3.0*0.52.50 2.599 2.459M18*1.017.0017.15316.917M3.0*0.5 2.73 2.751/2 -1311.2722.4022.00M3.0*0.62.40 2.440 2.280M20*2.018.0018.21017.835M3.5*0.6 3.17 3.20No.2-64UNF 1.9725.0024.80M3.5*0.62.903.010 2.850M20*1.518.5018.67618.376M4.0*0.7 3.62 3.65 3.69No.3-56 2.2728.3028.00M4.0*0.73.30 3.422 3.242M20*1.019.0019.15318.917M5.0*0.84.56 4.60 4.64No.4-48 2.56M4.0*0.753.25 3.326 3.106M22*2.020.0020.21019.835M6.0*1.0 5.45 5.50 5.55No.5-44 2.86M4.5*0.753.80 3.878 3.688M22*1.520.5020.67620.376M7.0*1.0 6.45 6.50 6.55No.6-40 3.16M5.0*0.84.20 4.334 4.134M22*1.021.0021.15320.917M8.0*1.257.317.387.44No.8-36 3.78M5.0*0.94.10 4.170 3.930M24*2.022.0022.21021.835M10*1.59.189.259.32No.10-32 4.39 4.43M6.0*1.05.00 5.153 4.917M24*1.522.5022.67622.376M10*1.259.319.389.44No.12-28 4.99 5.04SM1/8 -40M7.0*1.06.00 6.153 5.917M24*1.023.0023.15322.917M12*1.7511.0411.1211.211/4 -28 5.85 5.90SM1/8 -44M8.0*1.256.80 6.912 6.647M25*2.023.0023.21022.835M12*1.2511.3111.3811.445/16 -247.367.41SM9/64 -40M9.0*1.257.807.9127.647M25*1.523.5023.67623.3763/8 -249.00SM11/64-40M10*1.58.508.6768.376M25*1.024.0024.15323.9177/16 -2010.48SM3/16 -32M11*1.59.509.6769.376M26*1.524.5024.67624.3761/2 -2012.07SM3/16 -28M12*1.7510.3010.44110.106M27*2.025.0025.21024.835SM7/32 -32M14*2.012.0012.21011.835M27*1.525.5025.67625.376SM15/64-28M16*2.014.0014.21013.835M27*1.026.0026.15325.917SM1/4 -40M18*2.515.5015.74415.294M28*2.026.0026.21025.835SM1/4 -28M20*2.517.5017.74417.294M28*1.526.5026.67626.376SM9/32 -28M22*2.519.5019.74419.294M28*1.027.0027.15326.917规格最大SM11/32-28M24*3.021.0021.25220.752M30*3.027.0027.25226.752(UNC)最大最小PS 1/16 - 28 6.50 6.632SM3/8 -28M27*3.024.0024.25223.752M30*2.028.0028.21027.835 (螺丝牙外径)PS 1/8 - 288.508.637SM7/16 -28M30*3.526.5026.77126.211M30*1.528.5028.67628.376No.1-64(1.854) 1.55 1.582 1.425PS 1/4 - 1911.4011.549M30*1.029.0029.15328.917No.2-56(2.184) 1.80 1.871 1.695PS 3/8 - 1915.0015.054M32*2.030.0030.21029.835No.3-48(2.515) 2.10 2.146 1.941PS 1/2 - 1418.5018.773M32*1.530.5030.67630.376No.4-40(2.845) 2.30 2.385 2.157PS 3/4 - 1424.0024.259M33*3.030.0030.25229.752No.5-40(3.175) 2.60 2.697 2.487PS 1 - 1130.2030.471M33*2.031.0031.21030.835No.6-32(3.505) 2.80 2.895 2.642PS 1-1/4 - 1138.8039.132最大最小M33*1.531.5031.67631.376No.8-32(4.166) 3.40 3.53 3.302PS 1-1/2 - 1144.8045.025M1.0*0.20.800.8210.783M35*1.533.5033.67633.376No.10-24(4.826) 3.90 3.962 3.683PS 2 - 1156.5056.836M1.1*0.20.900.9210.883M36*3.033.0033.25232.752No.12-24(5.486) 4.50 4.597 4.344M1.2*0.2 1.00 1.0210.983M36*2.034.0034.21033.8351/4 - 20 5.10 5.257 4.979M1.4*0.2 1.20 1.221 1.183M36*1.534.5034.67634.3765/16 - 18 6.60 6.731 6.401M1.6*0.2 1.40 1.421 1.3833/8 - 168.008.1537.798M1.7*0.2 1.45 1.500 1.4607/16 - 149.409.559.144M1.8*0.2 1.60 1.621 1.5831/2 - 1310.8011.02310.592使用绞刀时不用绞刀时M2.0*0.25 1.75 1.785 1.7299/16 - 1212.2012.44611.989PT 1/16 -28 6.10 6.20 6.244 6.384M2.2*0.25 1.95 1.985 1.929规格5/8 - 1113.6012.86813.386PT 1/8 -288.108.208.4298.388M2.3*0.25 2.05 2.061 2.001(UNF)最大最小3/4 - 1016.5018.8416.307PT 1/4 -1910.7011.0010.96211.174M2.5*0.35 2.20 2.221 2.1217/8 - 919.5019.76119.177PT 3/8 -1914.2014.5014.44814.658M2.6*0.35 2.20 2.246 2.186No.0-80(1.524) 1.25 1.305 1.182 1 - 822.2022.60621.971PT 1/2 -1417.6018.0017.97918.263M3.0*0.35 2.70 2.721 2.621No.1-72(1.854) 1.55 1.612 1.4741-1/8 - 725.0025.34924.638PT 3/4 -1423.0023.5023.37823.663M3.5*0.35 3.20 3.221 3.121No.2-64(2.184) 1.85 1.912 1.7561-1/4 - 728.2028.52427.813PT 1 -1129.0029.5029.45929.822M4.0*0.5 3.50 3.599 3.459No.3-56(2.515) 2.10 2.197 2.0251-3/8 - 630.8031.11530.353PT 1-1/4 -1137.5038.0037.97638.339M4.5*0.5 4.00 4.099 3.959No.4-48(2.845) 2.40 2.458 2.2711-1/2 - 634.0034.2933.528PT 1-1/2 -1143.4044.0043.86944.232M5.0*0.5 4.50 4.599 4.459No.5-44(3.175) 2.70 2.74 2.5511-3/4 - 539.5039.82738.964PT 2 -1154.9055.5055.41255.844M5.5*0.55.00 5.099 4.959No.6-40(3.505) 2.90 3.022 2.82 2 - 4-1/245.2045.59344.679M6.0*0.755.30 5.378 5.188No.8-36(4.166) 3.50 3.606 3.404M6.0*0.55.50 5.550 5.400No.10-32(4.826) 4.10 4.165 3.963M7.0*0.756.30 6.378 6.188No.12-28(5.846) 4.60 4.724 4.496M7.0*0.56.50 6.550 6.4001/4 - 28 5.50 5.588 5.36M8.0*1.07.007.153 6.9175/16 - 24 6.907.035 6.782规格M8.0*0.757.307.3787.1883/8 - 248.508.6368.382(UNEF)最大最小使用绞刀时不用绞刀时M8.0*0.57.507.5207.4007/16 - 209.9010.0339.729No.12 - 32 4.70 4.826 4.6231/16 - 27 6.10 6.25M9.0*1.08.008.1537.9171/2 - 2011.5011.60711.3291/4 - 32 5.60 5.69 5.4861/8 -278.338.43M9.0*0.758.308.3788.1889/16 - 1812.9013.08112.7515/16 - 327.107.2647.0871/4 -1810.7211.13M10*1.258.808.9128.4675/8 - 1814.5014.68114.3513/8 - 328.708.8658.6613/8 -1814.2714.27M10*1.09.009.1538.9173/4 - 1617.5017.67817.3237/16 - 2810.2010.33810.1351/2 -1417.4817.86M10*0.759.309.3789.1887/8 - 1420.5020.67520.271/2 - 2811.8011.93811.7093/4 -1422.6323.01M10*0.59.509.5209.400 1 - 1223.2023.57123.1149/16 - 2413.2013.38613.132 1 -11-1/228.5828.98M11*1.010.0010.1539.9171-1/8 - 1226.5026.74626.2895/8 - 2414.8014.98614.7321-1/4 -11-1/237.3137.69M11*0.7510.3010.37810.1881-1/4 - 1229.5029.92129.4643/4 - 2017.8017.95817.6781-1/2 -11-1/243.6644.04M12*1.510.5010.67610.3761-3/8 - 1232.8033.09632.6397/8 - 2021.0021.13320.853 2 -11-1/255.5855.96M12*1.2510.8010.91210.6471-1/2 - 1236.0036.27135.814 1 - 2024.0024.30824.028螺 纹 攻 牙 钻 孔 径 和 滚 造 径 对 照 表本表所推选之钻头孔径，是针对攻牙加工时，能够很容易的了解钻孔直径；而依据市售之标准钻头所选定的。