The diameter of the bit selected in this
table is easy to understand when tapping, while the size and accuracy of the
drill are greatly affected by the shape and size of the bit, the accuracy and
the material of the drilled bit in the case of using the bit according to the
standard bit sold in the market. If there is any improper hole diameter in this
table, the bit diameter should be changed appropriately according to the actual
situation. This table is formulated on the basis of grade 2 teeth.
|
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
|
2.752
|
|
M27×3.0
|
24.00
|
24.252
|
23.752
|
|
M30×3.5
|
26.50
|
26.771
|
26.211
|
|
