螺母攻牙迫牙丝攻孔径

螺丝攻牙钻孔径和滚造径对照表

螺丝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；而依抿市售之标准钻头所选定的，在使用钻头的情况下，由于钻头的形状及尺寸、精度、被钻孔之材质等，对于所钻孔的尺寸、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 最大最小最大最小G4-G6G7-G8G9G4-G6G7-G8G9 硬材软材M1.0*0.250.750.7850.729M12*1.011.0011.15310.917M1.0*0.250.860.88-No 2 - 56UNC 1.94-- W1/8 - 40 2.65 2.60M1.1*0.250.850.8850.829M12*0.511.5011.52011.400M1.1*0.250.960.98-No 3 - 48 2.23-- W5/32 - 32 3.25 3.20M1.2*0.250.950.9850.929M14*1.512.5012.67612.376M1.2*0.25 1.06 1.08-No 4 - 40 2.50-- W3/16 - 24 3.75 3.70M1.4*0.30 1.00 1.142 1.075M14*1.013.0013.15312.917M1.4*0.30 1.24 1.25-No 5 - 40 2.83-- W1/4 - 20 5.10 5.00M1.6*0.35 1.25 1.321 1.221M15*1.513.5013.67613.376M1.6*0.35 1.41 1.43-No 6 - 32 3.07-- W5/16 - 18 6.60 6.50M1.7*0.35 1.35 1.421 1.321M15*1.014.0014.15313.917M1.7*0.35 1.51 1.53-No 8 - 32 3.73 3.77- W3/8 - 168.007.90M1.8*0.35 1.45 1.521 1.421M16.1.514.5014.67614.376M1.8*0.35 1.61 1.63-No10 - 24 4.24 4.30- W7/16 - 149.409.30M2.0*0.40 1.60 1.679 1.567M16*1.015.0015.15314.917M2.0*0.40 1.78 1.80-No12 - 24 4.90 4.96- W1/2 - 1210.7010.50M2.2*0.45 1.75 1.838 1.713M17*1.515.5015.67615.376M2.2*0.45 1.95 1.98-1/4 - 20- 5.72- W9/16 - 1212.3012.00M2.3*0.40 1.90 1.979 1.867M17*1.016.0016.15315.917M2.3*0.40 2.08 2.10-5/16 - 18-7.24- W5/8 - 1113.7012.50M2.5*0.45 2.10 2.138 2.013M18*2.016.0016.21015.835M2.5*0.45 2.25 2.28-3/8 - 16-8.748.81 W3/4 - 1016.7013.50M2.6*0.45 2.20 2.238 2.113M18*1.516.5016.67616.976M2.6*0.45 2.35 2.38-7/16 - 14-10.2010.30 W7/8 - 919.5016.50M3.0*0.50 2.50 2.599 2.459M18*1.017.0017.15316.917M3.0*0.50 2.73 2.75-1/2 - 13-11.2711.82 W1 - 822.4019.30M3.0*0.60 2.40 2.440 2.280M20*2.018.0018.21017.835M3.5*0.60 3.17 3.20-No 2 - 64UNF 1.97-- W1-1/8 - 725.0024.80M3.5*0.60 2.90 3.010 2.850M20*1.518.5018.67618.376M4.0*0.70 3.62 3.65 3.69No 3 - 56 2.27-- W1-1/4 - 728.3028.00M4.0*0.70 3.30 3.422 3.242M20*1.019.0019.15318.917M5.0*0.80 4.56 4.60 4.64No 4 - 48 2.56-- M4.0*0.75 3.25 3.326 3.106M22*2.020.0020.21019.835M6.0*1.00 5.45 5.50 5.55No 5 - 44 2.66-- M4.5*0.75 3.80 3.878 3.688M22*1.520.5020.67620.376M7.0*1.00 6.45 6.50 6.55No 6 - 40 3.16-- M5.0*0.80 4.20 4.334 4.134M22*1.021.0021.15320.917M8.0*1.257.317.387.44No 8 - 36 3.78-- M5.0*0.90 4.10 4.170 3.930M24*2.022.0022.21021.835M10*1.509.189.259.32No 10- 32 4.39 4.43- M6.0*1.00 5.00 5.153 4.917M24*1.522.5022.67622.376M10*1.259.319.389.44No 12 -28 4.99 5.04- M7.0*1.00 6.00 6.153 5.917M24*1.023.0023.15322.917M12*1.7511.0411.1211.211/4 -28 5.85 5.90- SM1/8 - 40 2.735 - 2.688M8.0*1.25 6.80 6.912 6.647M25*2.023.0023.21022.835M12*1.2511.3111.3811.445/16 -247.367.41- SM1/8 - 44 2.769 - 2.722M9.0*1.257.807.9127.647M25*1.523.5023.67623.3763/8 -24-9.00- SM9/64 - 40 3.128 - 3.083M10*1.508.508.6768.376M25*1.024.0024.15323.9177/16 -20-10.4810.54 SM11/64 - 40 3.855 - 3.805M11*1.509.509.6769.376M26*1.524.5024.67624.3761/2 -20-12.0712.13 SM3/16 - 32 4.205 - 4.155M12*1.7510.3010.44110.160M27*2.025.0025.21024.835 SM3/16 - 28 4.143 - 4.093M14*2.0012.0012.21011.835M27*1.525.5025.67625.376SM7/32 - 32 5.003 - 4.955M16*2.0014.0014.21013.835M27*1.026.0026.15325.917 SM15/64 - 28 5.325 - 5.570M18*2.5015.5015.74415.294M28*2.026.0026.21025.835 SM1/4 - 40 5.890 - 5.735M20*2.5017.5017.74417.294M28*1.526.5026.67626.376SM1/4 - 28 5.721 - 5.366M22*2.5019.5019.74419.294M28*1.027.0027.15326.917最大最小 SM9/32 - 28 6.508 - 5.648M24*3.0021.0021.25220.752M30*3.027.0027.15226.752最大最小PS 1/16 - 28 6.50 6.632 6.490 SM11/32 - 288.092 - 8.432M27*3.0024.0024.25223.752M30*2.028.0028.21027.835No 1-64(1.854) 1.55 1.582 1.425PS 1/8 - 288.508.6378.495 SM3/8 - 288.880 - 8.015M30*3.5026.5026.77126.211M30*1.528.5028.67628.376No 2-56(2.184) 1.80 1.871 1.695PS 1/4 - 1911.4011.54911.341 SM7/16 - 2810.466 - 10.401M30*1.029.0029.15328.917No 3-48(2.515) 2.10 2.146 1.941PS 3/8 - 1915.0015.05414.846 SM7/16 - 1610.037 - 9.967M32*2.030.0030.21029.835No 4-40(2.845) 2.30 2.385 2.157PS 1/2 - 1418.5018.77318.489 SM1/2 - 2011.819 - 11.749M32*1.530.5030.67630.376No 5-40(3.175) 2.60 2.697 2.487PS 3/4 - 1424.0024.25923.975 SM9/16 - 2013.400 - 13.425最大最小M33*1.030.0030.25229.752No 6-32(3.505) 2.80 2.895 2.642PS 1 - 1130.2030.47130.111 M1.0*0.20.800.8210.783M33*2.031.0031.21030.835No 8-32(4.166) 3.40 3.530 3.302PS 1-1/4 - 1138.8039.13238.772 M1.1*0.20.900.9210.883M33*1.531.5031.67631.376No 10-24(4.826) 3.90 3.962 3.683PS 1-1/2 - 1144.8045.02544.665 M1.2*0.2 1.00 1.0210.983M35*1.533.5033.67633.376No 12-24(5.486) 4.50 4.597 4.344PS 2 - 1156.5056.83656.476 M1.4*0.2 1.20 1.221 1.183M36*3.033.0033.25232.752 1/4 - 20 5.10 5.257 4.979 M1.6*0.2 1.40 1.421 1.383M36*2.034.0034.21033.835 5/16 - 18 6.60 6.731 6.401 M1.7*0.2 1.45 1.500 1.460M36*1.534.5034.67634.376 3/8 - 168.008.1537.798 M3*0.5 2.63 - 2.60M1.8*0.2 1.60 1.621 1.583 7/16 - 149.409.5509.144M3.0*0.6 2.56 - 2.50M2.0*0.25 1.75 1.785 1.729 1/2 - 1310.8011.02310.592M3.5*0.6 3.06 - 3.03M2.2*0.25 1.95 1.985 1.929 9/16 - 1212.2012.44611.989使用绞刀时不使用绞刀时M4.0*0.7 3.49 - 3.45M2.3*0.25 2.05 2.610 2.001 5/8 - 1113.6012.86813.386PT 1/16 - 28 6.10 6.20 6.244 6.384 M4.0*0.75 3.45 - 3.41M2.5*0.35 2.20 2.221 2.121最大最小 3/4 - 1016.5018.84016.307PT 1/8 - 288.108.208.2498.388 M4.5*.75 3.96 - 3.92M2.6*0.35 2.20 2.246 2.186No 0-80(1.524) 1.25 1.305 1.182 7/8 - 919.5019.76119.177PT 1/4 - 1910.7011.0010.96211.174 M5.0*0.8 4.43 - 4.38M3.0*0.35 2.70 2.721 2.621No 1-72(1.854) 1.55 1.612 1.474 1 - 822.2022.60621.971PT 3/8 - 1914.2014.5014.44814.658 M5.0*0.9 4.36 - 4.31M3.5*0.35 3.20 3.221 3.121No 2-64(2.184) 1.85 1.912 1.756 1-1/8 - 725.0025.34924.638PT 1/2 - 1417.6018.0017.97918.263 M6.0*1.0 5.30 - 5.25M4.0*0.5 3.50 3.599 3.459No 3-58(2.515) 2.10 2.197 2.025 1-1/4 - 728.2028.52427.813PT 3/4 - 1423.0023.5023.37823.663 M7.0*1.0 6.30 - 6.25M4.5*0.5 4.00 4.099 3.959No 4-48(2.845) 2.40 2.458 2.271 1-3/8 - 630.8031.11530.353PT 1 - 1129.0029.5029.45929.822 M8.0*1.07.28 - 7.23M5.0*0.5 4.50 4.599 4.459No 5-44(3.175) 2.70 2.740 2.551 1-1/2 - 634.0034.29033.528PT 1-1/4 - 1137.5038.0037.97638.339 M8.0*1.257.12 - 7.07M5.5*0.5 5.00 5.099 4.959No 6-40(3.506) 2.90 3.022 2.820 1-3/4 - 539.5039.82738.964PT 1-1/2 - 1143.4044.0043.86944.232 M6.0*0.75 5.30 5.378 5.188No 8-36(4.166) 3.50 3.606 3.404 2 - 4-1/245.2045.59344.679PT 2 - 1154.9055.5055.41255.844 M6.0*0.5 5.50 5.550 5.400No 10-32(4.826) 4.10 4.165 3.963 M7.0*0.75 6.30 6.378 6.188No 12-28(5.846) 4.60 4.724 4.496 M7.0*0.5 6.50 6.550 6.4001/4 - 28 5.50 5.588 5.360M8.0*1.07.007.153 6.9175/16 - 24 6.907.035 6.782 M8.0*0.757.307.3787.1883/8 - 248.508.6368.382最大最小M8.0*0.57.507.5207.4007/16 - 209.9010.0339.729No 12 - 32 4.700 4.826 4.623使用绞刀时不使用绞刀时2BA 4.0 - 4.2M9.0*1.08.008.1537.9171/2 - 2011.5011.60711.3291/4 - 32 5.600 5.690 5.4861/16 - 27 6.10 6.25 6.35 3BA M9.0*0.758.308.3788.1889/16 - 1812.9013.08112.7515/16 - 327.1007.2647.0871/8 - 278.338.438.74 4BA 3.0 - 3.2M10*1.258.808.9128.6475/8 - 1814.5014.68114.3513/8 - 328.7008.8658.6611/4 -1810.7211.1311.13 5BA 2.7 - 2.8M10*1.09.009.1538.9173/4 - 1617.5017.67817.3237/16 - 2810.20010.33810.1353/8 -1814.2714.2714.68 6BA 2.4 - 2.5M10*0.759.309.3789.1887/8 - 1420.5020.57520.2701/2 - 2811.80011.93811.7091/2 -1417.4817.8618.26 M10*0.59.509.5209.400 1 - 1223.2023.57123.1149/16 - 2413.20013.38613.1323/4 -1422.6323.0123.42 M11*1.010.0010.1538.9171-1/8 - 1226.5026.74626.2895/8 - 2414.80014.98614.732 1 -11-1/228.5828.9829.36 M11*0.7510.3010.37810.1881-1/4 - 1229.5029.92129.4643/4 - 2017.80017.95817.6781-1/4-11-1/237.3137.6938.10 M12*1.5010.5010.67610.3761-3/8 - 1232.8033.09632.6397/8 - 2021.00021.13320.8531-1/2-11-1/243.6644.0444.45 M12*1.2510.8010.91210.6471-1/2 - 1236.0036.27135.814 1 - 2024.00024.30824.028 2 -11-1/255.5855.9656.36规格钻孔径规格滚造径英制电器螺纹公制螺纹规格滚造径2级牙钻孔径NPT 英 制 管 螺 纹 英 制 管 螺 纹 规格标准径有效牙部之长度（最小）中之毋螺牙内径标准长度（最小）中 之毋螺牙内径 规格(UNC)标准径规格标准率规格(UNF)标准径2级牙钻孔径规格2级牙钻孔径规格(UNC)标准径2级牙钻孔径注:迫牙丝攻之钻孔径,在上表所列之数值,由于被加工材料之材质,硬度,形状,尺寸等之影响,多少会有所变动,因此于参考上表之同时,亦精增减若干。 规格2级牙钻孔径公 制 粗 螺 纹公 制 细 螺 纹规格精 度 等 级标准径2级牙钻孔径 规格标准径美 制 粗 螺 纹美制迫牙丝攻钻孔径 规格NPS 规格英 制 管 螺 纹 钻孔径 精 度 等 级 标准径公制迫牙丝攻钻孔径美 制 特 细 螺 纹钻孔径螺丝攻牙钻孔径和滚造径对照表钻孔径 公 制 细 螺 纹美 制 细 螺 纹英 制 螺 纹针车用螺纹规格

最全的螺纹孔径对照表

最大最小最大最小G4-G6G7-G8G9M1.0*0.250.750.7850.729M12*1.011.0011.15310.917M1.0*0.250.860.88M1.1*0.250.850.8850.829M12*0.511.5011.52011.400M1.1*0.250.960.98最大M1.2*0.250.950.9850.929M14*1.512.5012.67612.376M1.2*0.25 1.06 1.08G 1/167.72 6.84M1.4*0.3 1.10 1.142 1.075M14*1.013.0013.15312.917M1.4*0.3 1.24 1.25G(PF)1/89.738.85M1.6*0.35 1.25 1.321 1.221M15*1.513.5013.67613.376M1.6*0.35 1.41 1.431/413.1611.89M1.7*0.35 1.35 1.421 1.321M15*1.014.0014.15313.917M1.7*0.35 1.51 1.533/816.6615.40M1.8*0.35 1.45 1.521 1.421M16*1.514.5014.67614.376M1.8*0.35 1.61 1.631/220.9619.17M2.0*0.4 1.60 1.679 1.567M16*1.015.0015.15314.917M2*0.4 1.78 1.805/822.9121.13M2.2*0.45 1.75 1.838 1.713M17*1.515.5015.67615.376M2.2*0.45 1.95 1.983/426.4424.66M2.3*0.4 1.90 1.979 1.867M17*1.016.0016.15315.917M2.3*0.4 2.08 2.107/830.2028.42M2.5*0.45 2.10 2.138 2.013M18*2.016.0016.21015.835M2.5*0.45 2.25 2.28133.2530.93M2.6*0.45 2.20 2.238 2.113M18*1.516.5016.67616.376M2.6*0.45 2.35 2.38 1.12537.9035.58M3.0*0.5 2.50 2.599 2.459M18*1.017.0017.15316.917M3.0*0.5 2.73 2.75 1.2541.9139.59M3.0*0.6 2.40 2.440 2.280M20*2.018.0018.21017.835M3.5*0.6 3.17 3.20 1.37544.3242.01M3.5*0.6 2.90 3.010 2.850M20*1.518.5018.67618.376M4.0*0.7 3.62 3.65 3.69 1.547.8049.02M4.0*0.7 3.30 3.422 3.242M20*1.019.0019.15318.917M5.0*0.8 4.56 4.60 4.64 1.62551.9150.79M4.0*0.75 3.25 3.326 3.106M22*2.020.0020.21019.835M6.0*1.0 5.45 5.50 5.55 1.7553.7556.66 M4.5*0.75 3.80 3.878 3.688M22*1.520.5020.67620.376M7.0*1.0 6.45 6.50 6.552 59.61 M5.0*0.8 4.20 4.334 4.134M22*1.021.0021.15320.917M8.0*1.257.317.387.44M5.0*0.9 4.10 4.170 3.930M24*2.022.0022.21021.835M10*1.59.189.259.32M6.0*1.0 5.00 5.153 4.917M24*1.522.5022.67622.376M10*1.259.319.389.44M7.0*1.0 6.00 6.153 5.917M24*1.023.0023.15322.917M12*1.7511.0411.1211.21M8.0*1.25 6.80 6.912 6.647M25*2.023.0023.21022.835M12*1.25 11.3111.3811.44 M9.0*1.257.807.9127.647M25*1.523.5023.67623.376最大M10*1.58.508.6768.376M25*1.024.0024.15323.917PS 1/16 - 28 6.50 6.632M11*1.59.509.6769.376M26*1.524.5024.67624.376PS 1/8 - 288.508.637M12*1.7510.3010.44110.106M27*2.025.0025.21024.835PS 1/4 - 1911.4011.549M14*2.012.0012.21011.835M27*1.525.5025.67625.376PS 3/8 - 1915.0015.054M16*2.014.0014.21013.835M27*1.026.0026.15325.917PS 1/2 - 1418.5018.773M18*2.515.5015.74415.294M28*2.026.0026.21025.835PS 3/4 - 1424.0024.259M20*2.517.5017.74417.294M28*1.526.5026.67626.376PS 1 - 1130.2030.471M22*2.519.5019.74419.294M28*1.027.0027.15326.917规格PS 1-1/4 - 1138.8039.132M24*3.021.0021.25220.752M30*3.027.0027.25226.752(UNC) 最大最小PS 1-1/2 - 1144.8045.025M27*3.024.0024.25223.752M30*2.028.0028.21027.835 (螺丝牙外径) PS 2 - 11 56.50 56.836 M30*3.5 26.50 26.771 26.211 M30*1.528.5028.67628.376No.1-64(1.854) 1.55 1.582 1.425M30*1.029.0029.15328.917No.2-56(2.184) 1.80 1.871 1.695M32*2.030.0030.21029.835No.3-48(2.515) 2.10 2.146 1.941M32*1.530.5030.67630.376No.4-40(2.845) 2.30 2.385 2.157M33*3.030.0030.25229.752No.5-40(3.175) 2.60 2.697 2.487M33*2.031.0031.21030.835No.6-32(3.505) 2.80 2.895 2.642最大最小M33*1.531.5031.67631.376No.8-32(4.166) 3.40 3.530 3.302M1.0*0.20.800.8210.783M35*1.533.5033.67633.376No.10-24(4.826) 3.90 3.962 3.683M1.1*0.20.900.9210.883M36*3.033.0033.25232.752No.12-24(5.486) 4.50 4.597 4.344PT 1/16 -28 6.10 6.20 6.244 6.384M1.2*0.2 1.00 1.0210.983M36*2.034.0034.21033.8351/4 - 20 5.10 5.257 4.979PT 1/8 -288.108.208.4298.388M1.4*0.2 1.20 1.221 1.183M36*1.5 34.50 34.67634.376 5/16 - 18 6.60 6.731 6.401PT 1/4 -1910.7011.0010.96211.174M1.6*0.2 1.40 1.421 1.3833/8 - 168.008.1537.798PT 3/8 -1914.2014.5014.44814.658M1.7*0.2 1.45 1.500 1.4607/16 - 149.409.5509.144PT 1/2 -1417.6018.0017.97918.263M1.8*0.2 1.60 1.621 1.5831/2 - 1310.8011.02310.592PT 3/4 -1423.0023.5023.37823.663M2.0*0.25 1.75 1.785 1.7299/16 - 1212.2012.44611.989PT 1 -1129.0029.5029.45929.822M2.2*0.25 1.95 1.985 1.929规格5/8 - 1113.6012.86813.386PT 1-1/4 -1137.5038.0037.97638.339M2.3*0.25 2.05 2.061 2.001(UNF) 最大最小3/4 - 1016.5018.84016.307PT 1-1/2 -1143.4044.0043.86944.232M2.5*0.35 2.20 2.221 2.1217/8 - 919.5019.76119.177PT 2 -11 54.9055.5055.41255.844 M2.6*0.35 2.20 2.246 2.186No.0-80(1.524) 1.25 1.305 1.182 1 - 822.2022.60621.971M3.0*0.35 2.70 2.721 2.621No.1-72(1.854) 1.55 1.612 1.4741-1/8 - 725.0025.34924.638M3.5*0.35 3.20 3.221 3.121No.2-64(2.184) 1.85 1.912 1.7561-1/4 - 728.2028.52427.813M4.0*0.5 3.50 3.599 3.459No.3-56(2.515) 2.10 2.197 2.0251-3/8 - 630.8031.11530.353M4.5*0.5 4.00 4.099 3.959No.4-48(2.845) 2.40 2.458 2.2711-1/2 - 634.0034.29033.528M5.0*0.5 4.50 4.599 4.459No.5-44(3.175) 2.70 2.740 2.5511-3/4 - 5 39.5039.82738.964M5.5*0.5 5.00 5.099 4.959No.6-40(3.505) 2.90 3.022 2.820 2 - 4-1/245.20 45.593 44.679 使用绞刀时不用绞刀时 M6.0*0.75 5.30 5.378 5.188No.8-36(4.166) 3.50 3.606 3.4041/16 - 27 6.10 6.25M6.0*0.5 5.50 5.550 5.400No.10-32(4.826) 4.10 4.165 3.9631/8 -278.338.43M7.0*0.75 6.30 6.378 6.188No.12-28(5.846) 4.60 4.724 4.4961/4 -1810.7211.13M7.0*0.5 6.50 6.550 6.4001/4 - 28 5.50 5.588 5.3603/8 -1814.2714.27M8.0*1.07.007.153 6.9175/16 - 24 6.907.035 6.782规格1/2 -1417.4817.86M8.0*0.757.307.3787.1883/8 - 248.508.6368.382(UNEF)最大最小3/4 -1422.6323.01M8.0*0.57.507.5207.4007/16 - 209.9010.0339.729No.12 - 32 4.70 4.826 4.623 1 -11-1/228.5828.98M9.0*1.08.008.1537.9171/2 - 2011.5011.60711.3291/4 - 32 5.60 5.690 5.4861-1/4 -11-1/237.3137.69M9.0*0.758.308.3788.1889/16 - 1812.9013.08112.7515/16 - 327.107.2647.0871-1/2 -11-1/243.6644.04M10*1.258.808.9128.4675/8 - 1814.5014.68114.3513/8 - 328.708.8658.661 2 -11-1/2 55.5855.96 M10*1.09.009.1538.9173/4 - 1617.5017.67817.3237/16 - 2810.2010.33810.135M10*0.759.309.3789.1887/8 - 1420.5020.67520.2701/2 - 2811.8011.93811.709M10*0.59.509.5209.400 1 - 1223.2023.57123.1149/16 - 2413.2013.38613.132M11*1.010.0010.1539.9171-1/8 - 1226.5026.74626.2895/8 - 2414.8014.98614.732M11*0.7510.3010.37810.1881-1/4 - 1229.5029.92129.4643/4 - 2017.8017.95817.678M12*1.510.5010.67610.3761-3/8 - 1232.8033.09632.6397/8 - 2021.0021.13320.853M12*1.25 10.80 10.91210.647 1-1/2 - 1236.0 36.271 35.814 1 - 20 24.00 24.30824.028 规 格使用绞刀时不用绞刀时 有效牙部之长度(最小)中之母螺牙内径 标准长度(最小)中之母螺牙内径 螺 纹 攻 牙 钻 孔 径 和 滚 造 径 对 照 表 英制平行管用螺紋PF(G) (單位：mm) 大 径钻孔径 规格公 制 细 螺 纹 规格 标准径2级牙钻孔径标准径 2级牙钻孔径美 制 特 细 螺 纹 规 格 (螺丝牙外径) 美 制 细 螺 纹 美 制 管 螺 纹 钻 孔 径 标准径 美 制 粗 螺 纹 标准径2级牙钻孔径公 制 粗 螺 纹 公 制 迫 牙 丝 攻 钻 孔 径 规 格精 度 等 级公 制 细 螺 纹 2级牙钻孔径标准径规格14.95 18.6320.5924.12最小6.568.5711.4541.3745.4949.6751.4327.8830.2934.9438.958.49511.341英 制 管 螺 纹 钻孔径 最小规格标准径N P T 14.84623.97530.11138.77218.48944.66556.476 英 制 管 螺 纹 规格18.2623.4229.366.3511.1314.68N P S 44.4556.36 38.108.7457.30 6.490注：迫牙丝攻之钻孔径，在上表所列之数值，由于被加工 材料之材质、硬度、形状、尺寸等之影响，多少会有所变动，因此于参考上表之同时，亦请增减若干。 标准径2级牙钻孔径标准径 2级牙钻孔径

攻牙下孔径对照表

建議下孔徑Recommended Tap Drill Sizes ◎公製牙

● ● D1：Minor diameter of JIS Class 2 internal thread. But, the minor diameters D1 shown in ( ) are of JIS Class I internal threads because their nominal sizes are not specified in JIS Class 2. ● * Marked sizes have been eliminated from JIS since 1969. ◎公製牙

● The reccommended tap drill sizes indicated above are for JIS Class 2 Metric threads. ● D1：Minor diameter of JIS Class 2 internal thread. But, the minor diameters D1 shown in ( ) are of JIS Class I internal threads because their nominal sizes are not specified in JIS Class 2. ◎美製牙─ UNC，UNF

● The recommended tap drill sizes indicated above are for JIS Class 2B UNC & UNF threads, and ANSI BI . Ia Class 2B UNEF & UN threads. ● D1：Minor diameter of internal thread. For UNC and UNF threads, according to JIS Class 2B; For UNEF and UN threads, according to ANSI BI . Ia, Class 2B. ◎英製牙─ BSW ● The recommended tap drill sizes indicated above are for JIS Class 2 Whitworth threads. ● Generally, the tap drill sizes in column A are used for producing holes; When holes tend to be cut oversized, the tap drill sizes in column B should be selected. ● These tap drill sizes are in accordance with JIS B 1004-1966, while the nominal sizes with a * mark are in accordance with BSW (Please refer to page 135).

螺丝攻牙孔径对照表

螺丝攻牙钻孔径对照表 美制（粗）挤牙丝攻钻孔径 公制挤牙丝攻钻孔径 美制细牙螺纹 公制细牙螺纹 规格精度max min 规格精度max min 2-56UNC RH4 2.02 1.96M1.0 0.25RH40.920.90最大最小最大最小3-48RH4 2.32 2.25M1.1 0.25RH4 1.02 1.00螺丝牙外径 M7.0 0.50 6.50 6.550 6.4004-40RH5 2.60 2.52M1.2 0.25RH4 1.12 1.10No.0-80（1.524） 1.25 1.305 1.182M8.0 1.00 7.007.153 6.9175-40RH5 2.93 2.86M1.4 0.30RH4 1.294 1.270No.1-72（1.854） 1.55 1.612 1.474M 8.0 0.757.307.3787.1886-32RH5 3.17 3.09M1.6 0.35RH4 1.45 1.40No.2-64（2.184） 1.85 1.912 1.756M8.0 0.507.507.5207.4008-32RH6 3.83 3.75M1.7 0.35RH4 1.58 1.54No.3-56（2.515） 2.10 2.197 2.025M 9.0 1.008.008.1537.91710-24RH6 4.35 4.26M2.0 0.40RH4 1.85 1.81No.4-48（2.845） 2.40 2.458 2.271M9.0 0.758.308.3788.18812-24RH6 5.01 4.92M2.3 0.40RH4 2.15 2.11No.5-44（3.175） 2.70 2.740 2.551M10.0 1.258.808.9128.6471/4-20RH6 5.76 5.66M2.5 0.45RH4 2.33 2.28No.6-40（3.505） 2.90 3.022 2.820M10.0 1.009.009.1538.9175/16-18RH77.297.18M2.6 0.45RH4 2.43 2.38No.8-36（4.166） 3.50 3.606 3.404M10.0 0.759.309.3789.1883/8-16RH78.788.66M3.0 0.50RH5 2.81 2.76No.10-32（4.826） 4.10 4.165 3.963M10.0 0.509.509.5209.4007/16-14RH710.2510.11M3.5 0.60RH5 3.26 3.20No.12-28（5.486） 4.60 4.724 4.496M11.0 1.0010.0010.1539.9171/2-13RH811.7811.62M4.0 0.70RH6 3.70 3.651/4-28 5.50 5.588 5.360M11.0 0.7510.3010.37810.1889/16-12RH1013.2713.14M5.0 0.80RH6 4.66 4.595/16-24 6.907.035 6.782M12.0 1.5010.5010.67610.3765/8-11RH1114.7614.62M6.0 1.00RH7 5.57 5.483/8-248.508.6368.382M12.0 1.2510.8010.91210.6473/4-10RH1217.8817.67M7.0 1.00RH7 6.57 6.487/16-209.9010.0339.729M12.0 1.0011.0011.15310.9177/8-9RH1220.8520.68M8.0 1.00RH77.577.481/2-2011.5011.60711.329M12.0 0.5011.5011.52011.4001-8 RH13 23.84 23.65 M8.0 1.25RH77.417.349/16-1812.9013.08112.751M14.0 1.5012.5012.67612.376M10 1.00RH79.579.485/8-1814.5014.68114.351M14.0 1.0013.0013.15312.917美制（细）挤牙丝攻钻孔径 M10 1.25RH79.419.343/4-1617.5017.67817.323M15.0 1.5013.5013.67613.376规格精度max min M10 1.50RH79.289.187/8-1420.5020.67520.270M15.0 1.0014.0014.15313.9172-64UNF RH3 2.04 1.98M12 1.00RH711.5711.181-12 23.3023.57123.114M16.0 1.5014.5014.67614.3763-56RH4 2.35 2.29M12 1.25RH711.4111.051-1/8-1226.5026.74626.289M16.0 1.0015.0015.15314.9174-48RH4 2.64 2.57M12 1.50RH711.2811.481-1/4-1229.6029.92129.464M17.0 1.5015.5015.67615.3765-44RH4 2.95 2.88M12 1.75RH811.1511.341-3/8-1232.8033.09632.639M17.0 1.0016.0016.15315.9176-40RH5 3.26 3.19M14 1.50RH913.3013.211-1/2-12 36.00 36.271 35.814 M18.0 2.0016.0016.21015.8358-36RH5 3.88 3.80M14 2.00RH1013.0412.92M18.0 1.5016.5016.67616.37610-32RH5 4.48 4.41M16 1.50RH915.3015.21M18.0 1.0017.0017.15316.91712-28RH5 5.08 5.00M16 2.00RH1015.0414.92M20.0 2.0018.0018.21017.8351/4-28RH5 5.93 5.86M18 1.5RH1017.3117.22M20.0 1.5018.5018.67618.3765/16-24RH67.467.38M18 2.5RH1116.7816.63M20.0 1.0019.0019.15318.9173/8-24RH69.058.96M20 1.5RH1019.3119.22M22.0 2.0020.0020.21019.8357/16-20RH710.5410.44M20 2.5 RH11 18.78 18.63 M22.0 1.5020.5020.67620.3761/2-20RH712.1212.02M22.0 1.0021.0021.15320.9179/16-18RH913.6613.55最大最小M24.0 2.0022.0022.21021.8355/8-18RH915.2515.14螺丝牙外径 M24.0 1.5022.5022.67622.3763/4-16RH1018.3218.22 1. 外径-牙距?0.45=下孔＜D-P?0.45＞No.1-64（1.854） 1.55 1.582 1.425M24.0 1.0023.0023.15322.9177/8-14RH1121.3821.27 2. Dn=D-0.2P-0.00403?P?f1+0.0127?n No.2-56（2.184） 1.80 1.871 1.695M25.0 2.0023.0023.21022.8351-12RH12 24.4124.28 ＜例＞M3?0.5RH6 2级母螺纹攻牙 咬合率90%No.3-48（2.515） 2.10 2.146 1.941M25.0 1.5023.5023.67623.376Dn=3-0.2?0.5-0.00403?0.5?90+0.0127?6No.4-40（2.845） 2.30 2.385 2.157M25.0 1.0024.0024.15323.917 =2.80 No.5-40（3.175） 2.60 2.697 2.487M26.0 1.5024.5024.67624.376山数 山数 Dn=下孔径 D=基准外径 P=牙距No.6-32（3.505） 2.80 2.895 2.642M27.0 2.0025.0025.21024.835每25.4mm 每25.4mm f1=咬合率 n=RH 精度 No.8-32（4.166） 3.40 3.530 3.302M27.0 1.5025.5025.67625.3761000.254012 2.1167No.10-24（4.826） 3.90 3.962 3.683M27.0 1.0026.0026.15325.917800.317511 2.3091No.12-24（5.486） 4.50 4.597 4.344M28.0 2.0026.0026.21025.835720.352810 2.54001/4-20 5.10 5.257 4.979M28.0 1.5026.5026.67626.376640.39699 2.82225/16-18 6.60 6.731 6.401M28.0 1.0027.0027.15326.917600.42338 3.17503/8-168.008.1537.798M30.0 3.0027.0027.25226.752560.45367 3.62867/16-149.409.5509.144M30.0 2.0028.0028.21027.835480.52926 4.23331/2-1310.9011.02310.592M30.0 1.5028.5028.67628.376440.57735 5.0800规格吋 mm 9/16-1212.2012.46611.989M30.0 1.0029.0029.15328.917400.63504 1/2 5.6444 No. 0 0.0600 1.5245/8-1113.6013.86813.386M32.0 2.0030.0030.21029.835360.70564 6.350010.0730 1.8543/4-1016.6016.84016.307M32.0 1.5030.5030.67630.376320.79383 1/27.257120.0860 2.1847/8-919.6019.76119.177M33.0 3.0030.0030.25229.752280.90713 1/47.815430.0990 2.5151-8 22.3022.60621.971M33.0 2.0031.0031.21030.83524 1.058338.466740.1120 2.8451-1/8-725.0025.34924.638M33.0 1.5031.5031.67631.37620 1.27002 7/88.834850.1250 3.1751-1/4-728.2028.52427.813M35.0 1.5033.5033.67633.37618 1.41112 3/49.236460.1380 3.5051-3/8-630.8031.11530.353M36.0 3.0033.0033.25232.75216 1.58752 5/89.676280.1640 4.1661-1/2-634.0034.29033.528M36.0 2.0034.0034.21033.83514 1.81432 1/2 10.1600 100.1900 4.8261-3/4-539.5039.82738.964M36.0 1.50 34.50 34.67634.376 13 1.9538 12 0.2160 5.486 2-4-1/2 45.20 45.593 44.679 美制螺丝外径公厘（mm ）换算表 美制粗牙螺纹 规格标准径2级牙钻孔径NRT 下孔径计算式 2级牙钻孔径规格 标准径 2级牙钻孔径牙距mm 牙距mm 规格 标准径 山数节距换算表