本表所推选钻头孔径，是针对攻牙加工时，能够很容易的了解钻头直径，而依据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，精度有很大影响，所以使用本表之钻孔径，若有不当之处，应实际状况适当的变更钻头直径，本表依据2级牙制订。
|
公 制 粗 螺 纹 |
|||
|
规格 |
标准径 |
2级牙钻孔径 |
|
|
最大 |
最小 |
||
|
M1.0×0.25 |
0.75 |
0.785 |
0.729 |
|
M1.1×0.25 |
0.85 |
0.885 |
0.829 |
|
M1.2×0.25 |
0.95 |
0.985 |
0.929 |
|
M1.4×0.3 |
1.10 |
1.142 |
1.075 |
|
M1.6×0.35 |
1.25 |
1.321 |
1.221 |
|
M1.7×0.35 |
1.35 |
1.421 |
1.321 |
|
M1.8×0.35 |
1.45 |
1.521 |
1.421 |
|
M2.0×0.4 |
1.60 |
1.679 |
1.567 |
|
M2.2×0.45 |
1.75 |
1.838 |
1.713 |
|
M2.3×0.4 |
1.90 |
1.979 |
1.867 |
|
M2.5×0.45 |
2.10 |
2.138 |
2.013 |
|
M2.6×0.45 |
2.20 |
2.238 |
2.113 |
|
M3.0×0.5 |
2.50 |
2.599 |
2.459 |
|
M3.0×0.6 |
2.40 |
2.44 |
2.280 |
|
M3.5×0.6 |
2.90 |
3.010 |
2.850 |
|
M4.0×0.7 |
3.30 |
3.422 |
3.242 |
|
M4.0×0.75 |
3.25 |
3.326 |
3.106 |
|
M4.5×0.75 |
3.80 |
3.878 |
3.688 |
|
M5.0×0.8 |
4.20 |
4.334 |
4.134 |
|
M5.0×0.9 |
4.10 |
4.170 |
3.930 |
|
M6.0×1.0 |
5.00 |
5.153 |
4.917 |
|
M7.0×1.0 |
6.00 |
6.153 |
5.917 |
|
M8.0×1.25 |
6.80 |
6.912 |
6.647 |
|
M9.0×1.25 |
7.80 |
7.912 |
7.647 |
|
M10×1.5 |
8.50 |
8.676 |
8.376 |
|
M11×1.5 |
9.50 |
9.676 |
9.376 |
|
M12×1.75 |
10.30 |
10.441 |
10.106 |
|
M14×2.0 |
12.00 |
12.210 |
11.735 |
|
M16×2.0 |
14.00 |
14.210 |
13.835 |
|
M18×2.5 |
15.50 |
15.744 |
15.294 |
|
M20×2.5 |
17.50 |
17.744 |
17.294 |
|
M22×2.5 |
19.50 |
19.744 |
19.294 |
|
M24×3.0 |
21.00 |
21.252 |
20.752 |
|
M27×3.0 |
24.00 |
24.252 |
23.752 |
|
M30×3.5 |
26.50 |
26.771 |
26.211 |
|
公 制 细 螺 纹 |
|||
|
规格 |
标准径 |
2级牙钻孔径 |
|
|
最大 |
最小 |
||
|
M1.0×0.2 |
0.80 |
0.821 |
0.783 |
|
M1.1×0.2 |
0.90 |
0.921 |
0.883 |
|
M1.2×0.2 |
1.00 |
1.021 |
0.983 |
|
M1.4×0.2 |
1.20 |
1.221 |
0.183 |
|
M1.6×0.2 |
1.40 |
1.421 |
1.383 |
|
M1.7×0.2 |
1.45 |
1.500 |
1.460 |
|
M1.8×0.2 |
1.60 |
1.621 |
1.583 |
|
M2.0×0.25 |
1.75 |
1.785 |
1.729 |
|
M2.2×0.25 |
1.95 |
1.985 |
1.929 |
|
M2.3×0.25 |
2.05 |
2.061 |
2.001 |
|
M2.5×0.35 |
2.20 |
2.221 |
2.121 |
|
M2.6×0.35 |
2.20 |
2.246 |
2.186 |
|
M3.0×0.35 |
2.70 |
2.721 |
2.621 |
|
M3.5×0.35 |
3.20 |
3.221 |
3.121 |
|
M4.0×0.5 |
3.50 |
3.599 |
3.459 |
|
M4.5×0.5 |
4.00 |
4.099 |
3.959 |
|
M5×0.5 |
4.50 |
4.599 |
4.459 |
|
M5.5×0.5 |
5.00 |
5.099 |
4.959 |
|
M6.0×0.75 |
5.30 |
5.378 |
5.188 |
|
M6.0×0.5 |
5.50 |
5.550 |
5.400 |
|
M7.0×0.75 |
6.30 |
6.378 |
61.88 |
|
M7.0×0.5 |
6.50 |
6.550 |
64.00 |
|
M8.0×1.0 |
7.00 |
7.153 |
6.917 |
|
M8.0×0.75 |
7.30 |
7.378 |
7.188 |
|
M8×0.5 |
7.50 |
7.520 |
7.400 |
|
M9×1.0 |
8.00 |
8.153 |
7.917 |
|
M9×0.75 |
8.30 |
8.378 |
8.188 |
|
M10×1.25 |
8.80 |
8.912 |
8.647 |
|
M10×1.0 |
9.00 |
9.153 |
8.917 |
|
M10×0.75 |
9.30 |
9.378 |
9.188 |
|
M10×0.5 |
9.50 |
9.520 |
9.400 |
|
M11×1.0 |
10.00 |
10.153 |
9.917 |
|
M11×0.75 |
10.30 |
10.378 |
10.188 |
|
M11×1.5 |
10.50 |
10.676 |
10.376 |
|
M12×1.25 |
10.80 |
10.912 |
10.647 |
|
公 制 细 螺 纹 |
|||
|
规格 |
标准径 |
2级牙钻孔径 |
|
|
最大 |
最小 |
||
|
M12×1.0 |
11.00 |
11.153 |
10.917 |
|
M12×0.5 |
11.50 |
11.520 |
11.4 |
|
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 |
16.670 |
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 |
|
M20×2.0 |
20.00 |
20.210 |
19.835 |
|
M22×1.5 |
20.50 |
20.676 |
20.376 |
|
M22×1.0 |
21.00 |
21.153 |
20.917 |
|
M24×2.0 |
22.00 |
22.210 |
21.835 |
|
M24×1.5 |
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 |
30.376 |
|
M33×3.0 |
30.00 |
30.252 |
29.752 |
|
M33×2.0 |
31.00 |
31.210 |
30.835 |
|
M33×1.5 |
31.50 |
31.376 |
31.376 |
|
M35×1.5 |
33.50 |
33.676 |
33.376 |
|
M36×3.0 |
33.00 |
33.252 |
32.752 |
|
M36×2.0 |
34.00 |
34.210 |
33.835 |
|
M36×1.5 |
34.50 |
34.676 |
34.376 |
|
美 制 细 螺 纹 |
|||
|
规格(UNF) |
标准径 |
2级牙钻孔径 |
|
|
最大 |
最小 |
||
|
番数牙外径 |
|||
|
NO.0-80(1.524) |
1.25 |
1.305 |
1.182 |
|
NO.1-72(1.854) |
1.55 |
1.612 |
1.474 |
|
NO.2-64(2.184) |
1.85 |
1.912 |
1.756 |
|
NO.3-56(2.515) |
2.10 |
2.197 |
2.025 |
|
NO.4-48(2.845) |
2.40 |
2.458 |
2.271 |
|
NO.5-44(3.175) |
2.70 |
2.740 |
2.551 |
|
NO.6-40(3.505) |
2.90 |
3.022 |
2.820 |
|
NO.8-36(4.166) |
3.50 |
3.606 |
3.404 |
|
NO.10-32(4.826) |
4.10 |
4.165 |
3.963 |
|
NO.12-28(5.846) |
4.60 |
4.724 |
4.496 |
|
1/4 -28 |
5.50 |
5.588 |
5.360 |
|
5/16 -24 |
6.90 |
7.035 |
6.782 |
|
3/8 -24 |
8.50 |
8.636 |
8.382 |
|
7/16 -20 |
9.90 |
10.033 |
9.729 |
|
1/2 -20 |
11.50 |
11.607 |
11.329 |
|
9/16 -18 |
12.90 |
13.081 |
12.751 |
|
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