螺丝攻牙钻孔径和滚造径对照表
公制粗螺纹
美制粗螺纹
规格
标准径
2级牙钻孔径
规格（UNC）
标准径
2级牙钻孔径
最大
最小
最大
最小
M1.0×0.25
0.75
0.785
0.729
NO.1-64(1.854)
1.55
1.582
1.425
M1.1×0.25
0.85
0.885
0.829
NO.2-56(2.184)
1.80
1.871
1.695
M1.2×0.25
0.95
0.985
0.985
NO.3-48(2.515)
2.10
2.146
1.941
M1.4×0.3
1.10
1.142
1.075
NO.4-40(2.845)
2.30
2.385
2.157
M1.6×0.35
1.25
1.321
1.221
NO.5-40(3.175)
2.60
2.697
2.487
M1.7×0.35
1.35
1.421
1.321
NO.6-32(3.505)
2.80
2.895
2.642
M1.8×0.35
1.45
1.521
1.421
NO8-32(4.166)
3.40
3.53
3.302
M2.0×0.4
1.60
1.679
1.567
NO.10-24(4.826)
3.90
3.962
3.683
M2.2×0.45
1.75
1.838
1.713
NO.12-24(5.486)
4.50
4.597
4.344
M2.3×0.4
1.90
1.979
1.867
1/4-20
5.10
5.257
4.979
M2.5×0.45
2.10
2.138
2.013
5/16-18
6.60
6.731
6.401
M2.6×0.45
2.20
2.238
2.113
3/8-16
8.00
8.153
7.798
M3.0×0.5
2.50
2.599
2.459
7/16-14
9.40
9.55
9.144
M3.0×0.6
2.40
2.440
2.280
1/2-13
10.80
11.023
10.592
M3.5×0.6
2.90
3.010
2.850
9/16-12
12.20
12.446
11.989
M4.0×0.7
3.30
3.422
3.242
5/8-11
13.60
12.868
13.386
M4.0×0.75
3.25
3.326
3.106
3/4-10
16.50
18.840
16.307
M4.5×0.75
3.80
3.878
3.688
7/8-9
19.50
19.761
19.177
M5.0×0.8
4.20
4.334
4.134
1
22.20
22.606
21.971
M5.0×0.9
4.10
4.170
3.930
1-1/8-7
25.00
25.349
24.638
M6.0×1.0
5.00
5.153
4.917
1-1/4-7
28.20
28.524
27.813
M7.0×1.0
6.00
6.153
5.917
1-3/8-6
30.80
31.115
30.353
M8.0×1.25
6.80
6.912
6.647
1-1/2-6
34.00
34.290
33.528
M9.0×1.25
7.80
7.912
7.647
1-3/4-5
39.50
39.827
38.964
M10×1.5
8.50
8.676
8.376
2-4-1/2
45.20
45.593
44.679
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
11.835
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
