螺纹标准

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 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 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

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

0.785 0.885 0.985 1.142 1.321 1.421 1.521 1.679 1.838 1.979 2.138 2.238 2.599 2.440 3.010 3.422 3.326 3.878 4.334 4.170 5.153 6.153 6.912 7.912 8.676 9.676 10.441 12.210 14.210 15.744 17.744 19.744 21.252 24.252 26.771

0.729 0.829 0.929 1.075 1.221 1.321 1.421 1.567 1.713 1.867 2.013 2.113 2.459 2.280 2.850 3.242 3.106 3.688 4.134 3.930 4.917 5.917 6.647 7.647 8.376 9.376 10.160 11.835 13.835 15.294 17.294 19.294 20.752 23.752 26.211

公制细螺纹规格 标准率 2级牙钻孔径 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

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

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

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

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

11.00 11.50 12.50 13.00 13.50 14.00 14.50 15.00 15.50 16.00 16.00 16.5

0 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

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

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

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 M3.5*0.60 M4.0*0.70 M5.0*0.80 M6.0*1.00 M7.0*1.00 M8.0*1.25 M10*1.50 M10*1.25 M12*1.75 M12*1.25

0.86 0.96 1.06 1.24 1.41 1.51 1.61 1.78 1.95 2.08 2.25 2.35 2.73 3.17 3.62 4.56 5.45 6.45 7.31 9.18 9.31 11.04 11.31

0.88 0.98 1.08 1.25 1.43 1.53 1.63 1.80 1.98 2.10 2.28 2.38 2.75 3.20 3.65 4.60 5.50 6.50 7.38 9.25 9.38 11.12 11.38

3.69 4.64 5.55 6.55 7.44 9.32 9.44 11.21 11.44

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。

美制粗螺纹规格(UNC) 规格 标准径 2级牙钻孔径 级牙钻孔径 最大 最小

美制细螺纹规格(UNF) 规格 标准径 2级牙钻孔径 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

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

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

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

1.55 1.80 2.10 2.30 2.60 2.80 3.40 3.90 4.50 5.10 6.60 8.00 9.40 10.80 12.20 13.60 16.50 19.50 22.20 25.00 28.20 30.80 34.00 39.50 45.20

1.582 1.871 2.146 2.385 2.697 2.895 3.530 3.962 4.597 5.257 6.731 8.153 9.550 11.023 12.446 12.868 18.840 19.761 22.60

6 25.349 28.524 31.115 34.290 39.827 45.593

1.425 1.695 1.941 2.157 2.487 2.642 3.302 3.683 4.344 4.979 6.401 7.798 9.144 10.592 11.989 13.386 16.307 19.177 21.971 24.638 27.813 30.353 33.528 38.964 44.679

美制特细螺纹规格(UNC) 规格 标准径 2级牙钻孔径 级牙钻孔径 最大 最小

No 12 1/4 5/16 3/8 7/16 1/2 9/16 5/8 3/4 7/8 1

- 32 - 32 - 32 - 32 - 28 - 28 - 24 - 24 - 20 - 20 - 20

4.700 5.600 7.100 8.700 10.200 11.800 13.200 14.800 17.800 21.000 24.000

4.826 5.690 7.264 8.865 10.338 11.938 13.386 14.986 17.958 21.133 24.308

4.623 5.486 7.087 8.661 10.135 11.709 13.132 14.732 17.678 20.853 24.028

螺纹标准

螺丝攻牙钻孔径和滚造径对照表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、

美制迫牙丝攻钻孔径规格 No 2 - 56UNC No 3 - 48 No 4 - 40 No 5 - 40 No 6 - 32 No 8 - 32 No10 - 24 No12 - 24 1/4 - 20 5/16 - 18 3/8 - 16 7/16 - 14 1/2 - 13 No 2 - 64UNF No 3 - 56 No 4 - 48 No 5 - 44 No 6 - 40 No 8 - 36 No 10- 32 No 12 -28 1/4 -28 5/16 -24 3/8 -24 7/16 -20 1/2 -20 精 度 等级 G4-G6 G7-G8 1.94 2.23 2.50 2.83 3.07 3.73 3.77 4.24 4.30 4.90 4.96 5.72 7.24 8.74 10.20 11.27 1.97 2.27 2.56 2.66 3.16 3.78 4.39 4.43 4.99 5.04 5.85 5.90 7.36 7.41 9.00 10.48 12.07 G9 8.81 10.30 11.82 10.54 12.13 规格 W1/8 - 40 W5/32 - 32 W3/16 - 24 W1/4 - 20 W5/16 - 18 W3/8 - 16 W7/16 - 14 W1/2 - 12 W9/16 - 12 W5/8 - 11 W3/4 - 10 W7/8 - 9 W1 -8 W1-1/8 - 7 W1-1/4 - 7

英制螺纹钻孔径 硬材 2.65 3.25 3.75 5.10 6.60 8.00 9.40 10.70 12.30 13.70 16.70 19.50 22.40 25.00 28.30 软材 2.60 3.20 3.70 5.00 6.50 7.90 9.30 10.50 12.00 12.50 13.50 16.50 19.30 24.80 28.00

针车用螺纹规格 SM1/8 - 40 SM1/8 - 44 SM9/64 - 40 SM11/64 - 40 SM3/16 - 32 SM3/16 - 28 SM7/32 - 32 SM15/64 - 28 SM1/4 - 40 SM1/4 - 28 SM9/32 - 28 SM11/32 - 28 SM3/8 - 28 SM7/16 - 28 SM7/16 - 16 SM1/2 - 20 SM9/16 - 20 滚造径 2.735 - 2.688 2.769 - 2.722 3.128 - 3.083 3.855 - 3.805 4.205 - 4.155 4.143 - 4.093 5.003 - 4.955 5.325 - 5.570 5.890 - 5.735 5.721 - 5.366 6.508 - 5.648 8.092 - 8.432 8.880 - 8.015 10.466 - 10.401 10.037 - 9.967 11.819 - 11.749 13.400 - 13.425

英制 管 螺 纹规格 PS 1/16 - 28 PS 1/8 - 28 PS 1/4 - 19 PS 3/8 - 19 PS 1/2 - 14 PS 3/4 - 14 PS 1 - 11 PS 1-1/4 - 11 PS 1-1/2 - 11 PS 2 - 11 标准径 6.50 8.50 11.40 15.00 18.50 24.00 30.20 38.80 44.80 56.50 钻孔径 最大 最小 6.632 6.490 8.637 8.495 11.549 11.341 15.054 14.846 18.773 18.489 24.259 23.975 30.471 30.111 39.132 38.772 45.025 44.665 56.836 56.476

公制螺纹规格 滚造径 2.63 - 2.60 2.56 - 2.50 3.06 - 3.03 3.49 - 3.45 3.45 - 3.41 3.96 - 3.92 4.43 - 4.38 4.36 - 4.31 5.30 - 5.25 6.30 - 6.25 7.28 - 7.23 7.12 - 7.07 M3*0.5 M3.0*0.6 M3.5*0.6 M4.0*0.7 M4.0*0.75 M4.5*.75 M5.0*0.8 M5.0*0.9 M6.0*1.0 M7.0*1.0 M8.0*1.0 M8.0*1.25

英 制规格 PT 1/16 - 28 PT 1/8 - 28 PT 1/4 - 19 PT 3/8 - 19 PT 1/2 - 14 PT 3/4 - 14 PT 1 - 11 PT 1-1/4 - 11 PT 1-1/2 - 11 PT 2 - 11 6.10 8.10 10.70 14.20 17.60 23.00 29.00 37.5

0 43.40 54.90

管标准径

螺

纹有效牙部之长度(最 标准长度(最小)中 小)中之毋螺牙内径 之毋螺牙内径

使用绞刀时 不使用绞刀时

6.20 8.20 11.00 14.50 18.00 23.50 29.50 38.00 44.00 55.50

6.244 8.249 10.962 14.448 17.979 23.378 29.459 37.976 43.869 55.412

6.384 8.388 11.174 14.658 18.263 23.663 29.822 38.339 44.232 55.844

英制 管 螺 纹规格 1/16 - 27 1/8 - 27 1/4 -18 3/8 -18 1/2 -14 3/4 -14 1 -11-1/2 1-1/4-11-1/2 1-1/2-11-1/2 2 -11-1/2 6.10 8.33 10.72 14.27 17.48 22.63 28.58 37.31 43.66 55.58 钻孔径 NPT使用绞刀时 不使用绞刀时

英制电器螺纹规格 NPS 6.35 8.74 11.13 14.68 18.26 23.42 29.36 38.10 44.45 56.36 2BA 3BA 4BA 5BA 6BA 钻孔径 4.0 - 4.2 3.0 - 3.2 2.7 - 2.8 2.4 - 2.5

6.25 8.43 11.13 14.27 17.86 23.01 28.98 37.69 44.04 55.96