螺纹加工中攻螺纹-英制锥管螺纹和英制锥螺纹攻丝前钻底孔的钻头直径
编辑时间:2008-08-02 20:20
英制锥管螺纹 |
英制锥螺纹 |
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公称直径(") |
每25.4mm内的牙数 |
钻头直径(mm) |
公称直径(") |
每25.4mm内的牙数 |
钻头直径(mm) |
1/8 |
28 |
8.4 |
1/8 |
27 |
8.6 |
1/4 |
19 |
11.2 |
1/4 |
18 |
11.1 |
3/8 |
19 |
14.7 |
3/8 |
18 |
14.5 |
1/3 |
14 |
18.3 |
1/3 |
14 |
17.9 |
3/4 |
14 |
23.6 |
3/4 |
14 |
23.2 |
1 |
11 |
29.7 |
1 |
11(1/2) |
29.2 |
1(1/4) |
11 |
38.3 |
1(1/4) |
11(1/2) |
37.9 |
1(3/8) |
11 |
44.1 |
1(3/8) |
11(1/2) |
43.9 |
1(1/2) |
11 |
55.8 |
1(1/2) |
11(1/2) |
56 |