螺纹底孔表是用于确定钻孔直径以加工螺纹孔的参考表。不同的螺纹类型(如管螺纹、公制螺纹等)和螺距(粗牙、细牙)有不同的底孔直径。以下是常见螺纹类型的螺纹底孔表,包括管螺纹(G、Rc)、公制螺纹(粗牙、细牙)等。
管螺纹(G、Rc)底孔表
英制管螺纹(G、Rc)
螺纹规格 |
螺距 (TPI) |
底孔直径 (mm) |
G1/8 |
27 |
7.0 |
G1/4 |
18 |
10.0 |
G3/8 |
18 |
12.5 |
G1/2 |
14 |
15.9 |
G3/4 |
14 |
19.1 |
G1 |
11.5 |
24.6 |
G1 1/4 |
11.5 |
30.2 |
G1 1/2 |
11.5 |
36.4 |
G2 |
11.5 |
46.2 |
锥管螺纹(Rc)
螺纹规格 |
螺距 (TPI) |
底孔直径 (mm) |
Rc1/8 |
27 |
7.0 |
Rc1/4 |
18 |
10.0 |
Rc3/8 |
18 |
12.5 |
Rc1/2 |
14 |
15.9 |
Rc3/4 |
14 |
19.1 |
Rc1 |
11.5 |
24.6 |
Rc1 1/4 |
11.5 |
30.2 |
Rc1 1/2 |
11.5 |
36.4 |
Rc2 |
11.5 |
46.2 |
公制螺纹底孔表
公制粗牙螺纹
螺纹规格 |
螺距 (mm) |
底孔直径 (mm) |
M1.6 |
0.35 |
1.25 |
M2 |
0.4 |
1.6 |
M2.5 |
0.45 |
2.05 |
M3 |
0.5 |
2.5 |
M4 |
0.7 |
3.3 |
M5 |
0.8 |
4.2 |
M6 |
1.0 |
5.0 |
M8 |
1.25 |
6.75 |
M10 |
1.5 |
8.5 |
M12 |
1.75 |
10.25 |
M14 |
2.0 |
12.0 |
M16 |
2.0 |
14.0 |
M18 |
2.5 |
15.5 |
M20 |
2.5 |
17.5 |
M22 |
2.5 |
19.5 |
M24 |
3.0 |
21.0 |
M27 |
3.0 |
24.0 |
M30 |
3.5 |
26.5 |
M33 |
3.5 |
29.5 |
M36 |
4.0 |
32.0 |
M39 |
4.0 |
35.0 |
M42 |
4.5 |
37.5 |
M45 |
4.5 |
40.5 |
M48 |
5.0 |
43.0 |
M52 |
5.0 |
47.0 |
M56 |
5.0 |
51.0 |
M60 |
6.0 |
54.0 |
M64 |
6.0 |
58.0 |
M68 |
6.0 |
62.0 |
M72 |
6.0 |
66.0 |
M76 |
6.0 |
70.0 |
M80 |
6.0 |
74.0 |
公制细牙螺纹
螺纹规格 |
螺距 (mm) |
底孔直径 (mm) |
M1.6×0.35 |
0.35 |
1.25 |
M2x0.4 |
0.4 |
1.6 |
M2.5×0.45 |
0.45 |
2.05 |
M3x0.5 |
0.5 |
2.5 |
M4x0.7 |
0.7 |
3.3 |
M5x0.8 |
0.8 |
4.2 |
M6x1.0 |
1.0 |
5.0 |
M8x1.0 |
1.0 |
7.0 |
M10x1.0 |
1.0 |
9.0 |
M12x1.25 |
1.25 |
10.75 |
M14x1.5 |
1.5 |
12.5 |
M16x1.5 |
1.5 |
14.5 |
M18x1.5 |
1.5 |
16.5 |
M20x1.5 |
1.5 |
18.5 |
M22x1.5 |
1.5 |
20.5 |
M24x1.5 |
1.5 |
22.5 |
M27x2.0 |
2.0 |
25.0 |
M30x2.0 |
2.0 |
28.0 |
M33x2.0 |
2.0 |
31.0 |
M36x2.0 |
2.0 |
34.0 |
M39x2.0 |
2.0 |
37.0 |
M42x2.0 |
2.0 |
40.0 |
M45x2.0 |
2.0 |
43.0 |
M48x2.0 |
2.0 |
46.0 |
M52x2.0 |
2.0 |
50.0 |
M56x2.0 |
2.0 |
54.0 |
M60x2.0 |
2.0 |
58.0 |
M64x2.0 |
2.0 |
62.0 |
M68x2.0 |
2.0 |
66.0 |
M72x2.0 |
2.0 |
70.0 |
M76x2.0 |
2.0 |
74.0 |
M80x2.0 |
2.0 |
78.0 |
使用说明
- 选择合适的螺纹规格:根据您的应用需求选择合适的螺纹规格。
- 确定螺距:确认所选螺纹的螺距(粗牙或细牙)。
- 查表确定底孔直径:根据螺纹规格和螺距,查表确定所需的底孔直径。
- 钻孔:使用合适的钻头钻出底孔。
- 攻丝:使用相应的丝锥进行攻丝,形成螺纹孔。