| 切削技术基础之丝攻篇 |
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7、下孔径（公制、普通螺纹）（1）
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| 螺丝 |
下孔径 |
参考 |
| 标称 |
100% |
1级螺纹 |
2级螺纹 |
3级螺纹 |
最小尺寸 |
最大尺寸 |
| 1级 |
2级 |
3级 |
| M1*0.25 |
0.73 |
0.77(85%) |
0.78(80%) |
|
0.729 |
0.774 |
0.785 |
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| M1.1*0.25 |
0.83 |
0.87(85%) |
0.88(80%) |
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0.829 |
0.874 |
0.885 |
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| M1.2*0.25 |
0.93 |
0.97(85%) |
0.98(80%) |
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0.929 |
0.974 |
0.985 |
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| M1.4*0.3 |
1.08 |
1.12(85%) |
1.14(80%) |
|
1.075 |
1.128 |
1.142 |
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| M1.6*0.35 |
※ |
1.30(80%) |
1.32(75%) |
|
1.221 |
1.301 |
1.321 |
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| M1.7*0.35 |
※ |
1.40(80%) |
1.42(75%) |
|
1.321 |
1.401 |
1.421 |
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| M1.8*0.35 |
※ |
1.50(80%) |
1.52(75%) |
|
1.421 |
1.501 |
1.521 |
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| M2*0.4 |
1.57 |
1.65(80%) |
1.65(75%) |
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1.567 |
1.657 |
1.679 |
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| M2.2*0.45 |
※ |
1.81(80%) |
1.83(75%) |
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1.713 |
1.813 |
1.838 |
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| M2.3*0.4 |
1.87 |
1.95(80%) |
1.97(75%) |
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1.867 |
1.957 |
1.979 |
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| M2.5*0.45 |
※ |
2.11(80%) |
2.13(75%) |
|
2.013 |
2.113 |
2.138 |
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| M2.6*0.45 |
2.11 |
2.21(85%) |
2.22(75%) |
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2.113 |
2.213 |
2.238 |
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| ※M3*0.6 |
2.35 |
2.42(90%) |
2.42(90%) |
2.42(90%) |
2.280 |
2.420 |
2.440 |
2.440 |
| M2*0.5 |
2.46 |
2.57(80%) |
2.59(75%) |
2.62(70%) |
2.459 |
2.571 |
2.599 |
2.639 |
| M3.5*0.6 |
2.85 |
2.95(85%) |
3.01(75%) |
3.05(70%) |
2.850 |
2.975 |
3.010 |
3.050 |
| ※M4*0.75 |
3.19 |
3.23(85%) |
3.31(85%) |
3.31(85%) |
3.106 |
3.256 |
3.326 |
3.326 |
| M4*0.7 |
※ |
3.36(95%) |
3.39(80%) |
3.43(75%) |
3.242 |
3.382 |
3.422 |
3.466 |
| M4.5*0.75 |
3.69 |
3.81(85%) |
3.85(80%) |
3.89(75%) |
3.688 |
3.838 |
3.878 |
3.924 |
| ※M5*0.9 |
4.03 |
4.07(95%) |
4.17(85%) |
4.17(85%) |
3.930 |
4.090 |
4.170 |
4.170 |
| M5*0.8 |
※ |
4.26(85%) |
4.31(80%) |
4.35(75%) |
4.134 |
4.294 |
4.334 |
4.384 |
| ※M5.5*0.9 |
4.53 |
4.57(95%) |
4.67(85%) |
4.67(85%) |
4.430 |
4.590 |
4.670 |
4.670 |
| M6*1 |
4.92 |
5.08(85%) |
5.13(80%) |
5.19(75%) |
4.917 |
5.107 |
5.153 |
5.217 |
| M7*1 |
5.92 |
6.08(85%) |
6.13(80%) |
6.19(75%) |
5.917 |
6.107 |
6.153 |
6.217 |
| M8*1.25 |
6.65 |
6.85(85%) |
6.85(85%) |
6.92(80%) |
6.647 |
6.859 |
6.912 |
6.982 |
| M9*1.25 |
7.65 |
7.85(85%) |
7.85(85%) |
7.92(80%) |
7.647 |
7.859 |
7.912 |
7.982 |
| M10*1.5 |
8.38 |
8.54(90%) |
8.62(85%) |
8.70(80%) |
8.376 |
8.612 |
8.676 |
8.751 |
| M11*1.5 |
9.38 |
9.54(90%) |
9.62(85%) |
9.70(80%) |
9.376 |
9.612 |
9.676 |
9.751 |
| M12*1.75 |
※ |
10.30(90%) |
10.40(85%) |
10.50(80%) |
10.106 |
10.371 |
10.441 |
10.531 |
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下孔径（公制、普通螺纹）（2）
| 螺丝 |
下孔径 |
参考 |
| 标称 |
100% |
1级螺纹 |
2级螺纹 |
3级螺纹 |
最小尺寸 |
最大尺寸 |
| 1级 |
2级 |
3级 |
| M14*2 |
※ |
12.1(90%) |
12.2(85%) |
12.3(80%) |
11.835 |
12.135 |
12.210 |
12.310 |
| M16*2 |
※ |
14.1(90%) |
14.2(85%) |
14.3(80%) |
13.835 |
14.135 |
14.210 |
14.310 |
| M18*2.5 |
15.3 |
15.6(90%) |
15.7(85%) |
15.8(80%) |
15.294 |
15.649 |
15.744 |
15.854 |
| M20*2.5 |
17.3 |
17.6(90%) |
17.7(85%) |
17.8(80%) |
17.294 |
17.649 |
17.744 |
17.854 |
| M22*2.5 |
19.3 |
19.6(90%) |
19.7(85%) |
19.8(80%) |
19.294 |
19.649 |
19.744 |
18.854 |
| M24*3 |
20.8 |
21.1(90%) |
21.2(85%) |
21.2(85%) |
20.752 |
21.152 |
21.252 |
21.382 |
| M27*3 |
23.8 |
24.1(90%) |
24.2(85%) |
24.2(85%) |
23.752 |
24.152 |
24.252 |
24.382 |
| M30*3.5 |
※ |
26.6(90%) |
26.6(90%) |
26.8(85%) |
26.211 |
26.661 |
26.771 |
26.921 |
| M33*3.5 |
※ |
29.6(90%) |
29.6(90%) |
29.8(85%) |
29.211 |
29.661 |
29.771 |
29.921 |
| M36*4 |
31.7 |
32.1(90%) |
32.1(90%) |
32.3(85%) |
31.670 |
32.145 |
32.270 |
32.420 |
| M39*4 |
34.7 |
35.1(90%) |
35.1(90%) |
35.3(85%) |
34.670 |
35.145 |
35.270 |
35.420 |
| M42*4.5 |
※ |
37.6(90%) |
37.6(90%) |
37.9(85%) |
37.129 |
37.659 |
37.799 |
37.979 |
| M45*4.5 |
※ |
40.6(90%) |
40.6(90%) |
40.9(85%) |
40.129 |
40.659 |
40.799 |
40.979 |
| M48*5 |
42.6 |
43.1(90%) |
43.1(90%) |
43.4(85%) |
42.587 |
43.147 |
43.297 |
43.487 |
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| 无沟丝攻（下孔径） |
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| M |
PITCH |
DRILL SIZE（鑚头规格） |
| mm |
inch |
| 1 |
0.25 |
0.9 |
.0350 |
| 1.1 |
0.25 |
1.0 |
.0390 |
| 1.2 |
0.25 |
1.1 |
.0430 |
| 1.4 |
0.3 |
1.25 |
.0492 |
| 1.6 |
0.35 |
1.45 |
.0571 |
| 1.7 |
0.35 |
1.55 |
.0610 |
| 1.8 |
0.35 |
1.65 |
.0650 |
| 2 |
0.4 |
1.8 |
.0700 |
| 2.2 |
0.45 |
2.0 |
.0785 |
| 2.3 |
0.4 |
2.1 |
.0820 |
| 2.5 |
0.45 |
2.3 |
.0906 |
| 2.6 |
0.45 |
2.4 |
.0945 |
| 3 |
0.5 |
2.8 |
.1102 |
| 4 |
0.7 |
3.7 |
.1457 |
| 5 |
0.8 |
4.65 |
.1831 |
| 6 |
1 |
5.55 |
.2185 |
| 8 |
1.25 |
7.45 |
.2933 |
| 10 |
1.5 |
9.35 |
.3681 |
| 12 |
1.75 |
11.2 |
.4409 |
| 14 |
2 |
13.1 |
.5157 |
| 16 |
2 |
15.1 |
.5945 |
| 18 |
2.5 |
16.9 |
.6654 |
| 20 |
2.5 |
18.9 |
.7441 |
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| MF |
PITCH |
DRILL SIZE（鑚头规格） |
| mm |
inch |
| 4 |
0.5 |
3.8 |
.1496 |
| 5 |
0.5 |
4.8 |
.1890 |
| 6 |
0.75 |
5.65 |
.2224 |
| 8 |
0.75 |
7.65 |
.3012 |
| 8 |
1 |
7.55 |
.2972 |
| 10 |
1 |
9.55 |
.3760 |
| 10 |
1.25 |
9.45 |
.3720 |
| 12 |
1 |
11.55 |
.4547 |
| 12 |
1.25 |
11.45 |
.4508 |
| 12 |
1.5 |
11.35 |
.4469 |
| 14 |
1 |
13.55 |
.5335 |
| 14 |
1.25 |
13.45 |
.5295 |
| 14 |
1.5 |
13.35 |
.5256 |
| 16 |
1 |
15.55 |
.6122 |
| 16 |
1.5 |
15.35 |
.6043 |
| 18 |
1 |
17.55 |
.6909 |
| 18 |
1.5 |
17.35 |
.9831 |
| 20 |
1 |
19.55 |
.7697 |
| 20 |
1.5 |
19.35 |
.7618 |
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