本表所推选钻头孔径，是针对攻牙加工时，能够很容易的了解钻头直径，而依据市售之标准钻头所选定的，在使用钻头的情况下，由于钻头的形状及尺寸，精度，被钻孔之材质等，对于所钻孔的尺寸，精度有很大影响，所以使用本表之钻孔径，若有不当之处，应实际状况适当的变更钻头直径，本表依据2级牙制订。
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
公 制 细 螺 纹
规格
标准径
2级牙钻孔径
最大
最小
M1.0×0.2
0.80
0.821
0.783
M1.1×0.2
0.90
0.921
0.883
M1.2×0.2
1.00
1.021
0.983
M1.4×0.2
1.20
1.221
0.183
M1.6×0.2
1.40
1.421
1.383
M1.7×0.2
1.45
1.500
1.460
M1.8×0.2
1.60
1.621
1.583
M2.0×0.25
1.75
1.785
1.729
M2.2×0.25
1.95
1.985
1.929
M2.3×0.25
2.05
2.061
2.001
M2.5×0.35
2.20
2.221
2.121
M2.6×0.35
2.20
2.246
2.186
M3.0×0.35
2.70
2.721
2.621
M3.5×0.35
3.20
3.221
3.121
M4.0×0.5
3.50
3.599
3.459
M4.5×0.5
4.00
4.099
3.959
M5×0.5
4.50
4.599
4.459
M5.5×0.5
5.00
5.099
4.959
M6.0×0.75
5.30
5.378
5.188
M6.0×0.5
5.50
5.550
5.400
M7.0×0.75
6.30
6.378
61.88
M7.0×0.5
6.50
6.550
64.00
M8.0×1.0
7.00
7.153
6.917
M8.0×0.75
7.30
7.378
7.188
M8×0.5
7.50
7.520
7.400
M9×1.0
8.00
8.153
7.917
M9×0.75
8.30
8.378
8.188
M10×1.25
8.80
8.912
8.647
M10×1.0
9.00
9.153
8.917
M10×0.75
9.30
9.378
9.188
M10×0.5
9.50
9.520
9.400
M11×1.0
10.00
10.153
9.917
M11×0.75
10.30
10.378
10.188
M11×1.5
10.50
10.676
10.376
M12×1.25
10.80
10.912
10.647
公 制 细 螺 纹
规格
标准径
2级牙钻孔径
最大
最小
M12×1.0
11.00
11.153
10.917
M12×0.5
11.50
11.520
11.4
M14×1.5
12.50
12.676
12.376
M14×1.0
13.00
13.153
12.917
M15×1.5
13.50
13.676
13.376
M15×1.0
14.00
14.153
13.917
M16×1.5
14.50
14.676
14.376
M16×1.0
15.00
15.153
14.917
M17×1.5
15.50
15.676
15.376
M17×1.0
16.00
16.153
15.917
M18×2.0
16.00
16.210
15.835
M18×1.5
16.50
16.670
16.376
M18×1.0
17.00
17.153
16.917
M20×2.0
18.00
18.210
17.835
M20×1.5
18.50
18.676
18.376
M20×1.0
19.00
19.153
18.917
M20×2.0
20.00
20.210
19.835
M22×1.5
20.50
20.676
20.376
M22×1.0
21.00
21.153
20.917
M24×2.0
22.00
22.210
21.835
M24×1.5
22.50
22.676
22.376
M24×1.0
23.00
23.153
22.917
M25×2.0
23.00
23.210
22.835
M25×1.5
23.50
23.676
23.376
M25×1.0
24.00
24.153
23.917
M26×1.5
24.50
24.676
24.376
M27×2.0
25.00
25.210
24.835
M27×1.5
25.50
25.676
25.376
M27×1.0
26.00
26.153
25.917
M28×2.0
26.00
26.210
25.835
M28×1.5
26.50
26.676
26.376
M28×1.0
27.00
27.153
26.917
M30×3.0
27.00
27.252
26.752
M30×2.0
28.00
28.210
27.835
M30×1.5
28.50
28.676
28.376
M30×1.0
29.00
29.153
28.917
M32×2.0
30.00
30.210
29.835
M32×1.5
30.50
30.676
30.376
M33×3.0
30.00
30.252
29.752
M33×2.0
31.00
31.210
30.835
M33×1.5
31.50
31.376
31.376
M35×1.5
33.50
33.676
33.376
M36×3.0
33.00
33.252
32.752
M36×2.0
34.00
34.210
33.835
M36×1.5
34.50
34.676
34.376
美 制 细 螺 纹
规格(UNF)
标准径
2级牙钻孔径
最大
最小
番数牙外径
NO.0-80(1.524)
1.25
1.305
1.182
NO.1-72(1.854)
1.55
1.612
1.474
NO.2-64(2.184)
1.85
1.912
1.756
NO.3-56(2.515)
2.10
2.197
2.025
NO.4-48(2.845)
2.40
2.458
2.271
NO.5-44(3.175)
2.70
2.740
2.551
NO.6-40(3.505)
2.90
3.022
2.820
NO.8-36(4.166)
3.50
3.606
3.404
NO.10-32(4.826)
4.10
4.165
3.963
NO.12-28(5.846)
4.60
4.724
4.496
1/4 -28
5.50
5.588
5.360
5/16 -24
6.90
7.035
6.782
3/8 -24
8.50
8.636
8.382
7/16 -20
9.90
10.033
9.729
1/2 -20
11.50
11.607
11.329
9/16 -18
12.90
13.081
12.751
5/8 -18
14.50
14.681
14.351
3/4 -16
17.50
14.678
17.323
7/8 -14
20.50
20.675
20.270
1 -12
23.20
23.571
23.114
1-1/8 -12
26.50
26.746
26.289
1-1/4 -12
29.50
29.921
29.464
1-3/8 -12
32.80
33.096
32.464
1-1/2 -12
36.00
36.270
35.814
无 屑 丝 攻 钻 孔 径
规格
精度等级
RH4.5.6
RH7.8
RH9
M1.0×0.25
0.86
0.88
-
M1.1×0.25
0.96
0.98
-
M1.2×0.25
1.06
1.08
-
M1.4×0.3
1.24
1.25
-
M1.6×0.35
1.41
1.43
-
M1.7×0.35
1.51
1.53
-
M1.8×0.35
1.61
1.63
-
M2.0×0.4
1.78
1.80
-
M2.2×0.45
1.95
1.98
-
M2.3×0.4
2.08
2.10
-
M2.5×0.45
2.25
2.28
-
M2.6×0.45
2.35
1.38
-
M3.0×0.5
2.73
2.75
-
M3.0×0.6
3.17
3.20
-
M4.0×0.7
3.62
3.65
3.69
M5.0×0.8
4.56
4.60
4.64
M6.0×1.0
5.45
5.50
5.55
M7.0×1.0
6.45
6.50
6.55
M8.0×1.25
7.31
7.38
7.44
M10×1.5
9.18
9.25
9.32
M10×1.25
9.31
9.38
9.44
M12×1.75
11.04
11.12
11.21
M12×1.25
11.31
11.38
11.44
美 制 管 螺 纹
规格(UNEF)
标准径
2级牙钻孔径
最大
最小
NO.12 -32
4.70
4.826
4.623
1/4 -32
5.60
5.690
5.486
5/16 -32
7.10
7.264
7.087
3/8 -32
8.70
8.865
8.661
7/16 -28
10.20
10.338
10.135
1/2 -28
11.80
11.938
11.709
9/16 -28
13.20
13.386
13.132
5/8 -24
14.80
14.986
14.732
3/4 -20
17.80
17.958
17.678
7/8 -20
21.00
21.133
20.853
1 -20
24.00
24.308
24.028
美 制 粗 螺 纹
规格(UNC)
标准径
2级牙钻孔径
番数牙外径
最大
最小
NO.1-64(1.854)
1.55
1.582
1.425
NO.2-56(2.184)
1.80
1.871
1.695
NO.3-48(2.515)
2.10
2.146
1.941
NO.4-40(2.845)
2.30
2.385
2.157
NO.5-40(3.175)
2.60
2.697
2.487
NO.6-32(3.505)
2.80
2.895
2.642
NO.8-32(4.166)
3.40
3.530
3.302
NO.10-24(4.826)
3.90
3.962
3.682
NO.12-24(5.846)
4.50
4.597
4.344
1/4 -20
5.10
5.257
4.979
5/16 -18
6.60
6.731
6.401
3/8 -16
8.00
8.153
7.987
7/16 -14
9.40
9.500
9.144
1/2 -13
10.80
11.023
10.592
9/16 -12
12.20
12.446
11.989
5/8 -11
13.60
12.868
13.386
3/4 -10
16.20
16.840
16.307
7/8 -9
19.50
19.761
19.177
1 -8
22.20
22.606
21.971
1-1/8 -7
25.00
25.349
24.638
1-1/4 -7
28.20
28.524
27.813
1-3/8 -6
30.80
31.115
30.353
1-1/2 -6
34.00
34.290
33.528
1-3/4 -5
39.50
39.827
38.964
2 -4-1/2
45.20
45.593
44.679
英制螺纹
规格
钻孔径
硬材
软材
W1/8 - 40
2.65
2.60
W5/32 - 32
3.25
3.20
W3/16 - 24
3.75
3.70
W1/4 - 20
5.10
5.00
W5/16 - 18
6.60
6.50
W3/8 - 16
8.00
7.90
W7/16 - 14
9.40
9.30
W1/2 - 12
10.70
10.50
W9/16 - 12
12.30
12.00
W5/8 - 11
13.70
13.50
W3/4 - 10
16.70
16.50
W7/8 - 9
19.50
19.30
W1 - 8
22.40
22.00
W1-1/8 - 7
25.00
24.80
W1-1/4 - 7
28.30
28.00
英制管螺纹
规格
标准径
钻孔径
最大
最小
PS1/16 -28
6.50
6.632
6.490
PS1/8 -28
8.50
8.637
8.495
PS1/4 - 19
11.40
11.549
11.341
PS3/8 - 19
15.00
15.054
14.846
PS1/2 - 14
18.50
18.773
18.489
PS3/4 - 14
24.00
24.259
23.975
PS1 - 11
30.20
30.471
30.111
PS1-1/4 -11
38.80
39.132
38.772
PS1-1/2 -11
44.80
45.025
44.665
PS2 - 11
56.50
56.836
56.476
英制管螺纹
规格
标准径
有效牙部之长度(最小)中
之母螺牙内径
标准长度(最小)中
之母螺牙内径
使用绞刀时
不用绞刀时
PT1/16 -28
6.10
6.2
6.244
6.384
PT1/8 -28
8.10
8.2
8.249
8.388
PT1/4 -19
10.70
11
10.962
11.174
PT3/8 -19
14.20
14.5
14.448
14.658
PT1/2 -14
17.60
18
17.979
18.263
PT3/4 -14
23.00
23.5
23.378
23.663
Pt1 -11
29.00
29.5
29.459
29.822
PT1-1/4 -11
37.50
38
37.976
38.339
PT1-1/2 -11
43.40
44
43.869
44.232
Pt2 -11
54.90
55.5
55.412
55.844
美制螺纹滚造径
规格
钻孔径
NPT
NPS
使用绞刀时
不用绞刀时
1/16 -27
6.1
6.25
6.35
1/8 -27
8.33
8.43
8.74
1/4 -18
10.72
11.13
11.13
3/8 -18
14.27
14.27
14.68
1/2 -14
17.48
17.86
18.26
3/4 -14
22.63
23.01
23.42
1 -11-1/2
28.58
28.98
29.36
1-1/4-11-1/2
37.31
37.69
38.1
1-1/2-11-1/2
43.66
44.04
44.45
2 -11-1/2
55.58
55.96
56.36
英制螺纹滚造径
规格
滚造径
W 3/16 - 24
4.08 - 4.05
W 1/4 - 20
5.51 - 5.46
W 5/16 - 18
7.01 - 6.95
W 3/8 - 16
8.48 - 8.41
W 7/16 - 14
9.92 - 9.85
W 1/2 - 12
11.31 - 11.24
W 9/16 -12
12.89 - 12.82
公制螺纹
规格
滚造径
M3.0×0.6
2.56 2.53
M3.5×0.6
3.06 3.03
M4.0×0.7
3.49 3.45
M4.0×0.75
3.45 3.41
M4.5×0.75
3.96 3.92
M5.0×0.8
4.43 4.38
M5.0×0.9
4.36 4.31
M6.0×1.0
5.30 5.25
M7.0×1.0
6.30 6.25
M8.0×1.0
7.28 - 7.23
M8.0×1.25
7.12 - 7.07
M9.0×1.25
8.12 - 8.07
M10×1.25
9.10 - 9.04
M10×1.5
8.97 - 8.91
M11×1.5
9.97 - 9.91
M12×1.5
10.92 - 10.87
M12×1.75
10.79 - 10.73
M14×2.0
12.63 - 12.56
M16×2.0
14.63 - 14.56
M18×2.5
16.31 - 16.23
M20×2.5
18.31 - 18.23
M22×2.5
20.31 - 20.23
针车用螺纹
规格(UNC)
滚造径
SM 1/8 40
2.735 -2.688
SM 1/8 44
2.769 -2.722
SM 9/64 40
3.128 -3.083
SM 11/64 40
3.855 -3.805
SM 3/16 32
4.205 -4.155
SM 3/16 28
4.143 -4.093
SM 7/32 32
5.003 -4.955
SM 15/64 28
5.325 -4.955
SM 1/4 40
5.890 -5.735
SM 1/4 28
5.721 -5.366
SM 9/32 28
6.528 -6.648
SM 11/32 28
8.092 -8.432
SM 3/8 29
8.880 -8.015
SM 7/16 30
10.466 -10.401
SM 7/16 16
10.037 -9.967
SM 1/2 20
11.819 -11.749
SM 9/16 20
13.400 -13.425
美制粗螺纹
规格(UNC)
滚造径
NO.5-40
2.70 - 2.67
NO.6-32
2.95 - 2.91
NO.8-32
3.60 - 3.57
NO.10-24
4.09 - 4.05
NO.12-24
4.75 - 4.70
1/4 -20
5.50 - 5.45
5/16 -18
6.98 - 6.93
3/8 -16
8.45 - 8.40
7/16 -14
9.89 - 9.83
1/2 -13
11.39 - 11.32
9/16 -12
12.87 - 12.80
美制细螺纹
规格(UNF)
滚造径
NO.5-44
2.73 - 2.70
NO.6-40
3.05 - 3.02
NO.8-36
3.66 - 3.63
NO.10-32
4.26 - 4.80
NO.12-28
4.84 - 4.80
1/4 -28
5.72 - 5.68
5/16 -24
7.20 - 7.16
3/8 -24
8.79 - 8.74
7/16 -20
10.23 - 10.18
1/2 -20
11.82 - 11.76
如果您对本文有任何看法或者知识补充，欢迎在文章尾部写留言！
本表所推选钻头孔径，是针对攻牙加工时，能够很容易的了解钻头直径，而依据市售之标准钻头所选定的，在使用钻头的情况下，由于钻头的形状及尺寸，精度，被钻孔之材质等，对于所钻孔的尺寸，精度有很大影响，所以使用本表之钻孔径，若有不当之处，应实际状况适当的变更钻头直径，本表依据2级牙制订。
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
公 制 细 螺 纹
规格
标准径
2级牙钻孔径
最大
最小
M1.0×0.2
0.80
0.821
0.783
M1.1×0.2
0.90
0.921
0.883
M1.2×0.2
1.00
1.021
0.983
M1.4×0.2
1.20
1.221
0.183
M1.6×0.2
1.40
1.421
1.383
M1.7×0.2
1.45
1.500
1.460
M1.8×0.2
1.60
1.621
1.583
M2.0×0.25
1.75
1.785
1.729
M2.2×0.25
1.95
1.985
1.929
M2.3×0.25
2.05
2.061
2.001
M2.5×0.35
2.20
2.221
2.121
M2.6×0.35
2.20
2.246
2.186
M3.0×0.35
2.70
2.721
2.621
M3.5×0.35
3.20
3.221
3.121
M4.0×0.5
3.50
3.599
3.459
M4.5×0.5
4.00
4.099
3.959
M5×0.5
4.50
4.599
4.459
M5.5×0.5
5.00
5.099
4.959
M6.0×0.75
5.30
5.378
5.188
M6.0×0.5
5.50
5.550
5.400
M7.0×0.75
6.30
6.378
61.88
M7.0×0.5
6.50
6.550
64.00
M8.0×1.0
7.00
7.153
6.917
M8.0×0.75
7.30
7.378
7.188
M8×0.5
7.50
7.520
7.400
M9×1.0
8.00
8.153
7.917
M9×0.75
8.30
8.378
8.188
M10×1.25
8.80
8.912
8.647
M10×1.0
9.00
9.153
8.917
M10×0.75
9.30
9.378
9.188
M10×0.5
9.50
9.520
9.400
M11×1.0
10.00
10.153
9.917
M11×0.75
10.30
10.378
10.188
M11×1.5
10.50
10.676
10.376
M12×1.25
10.80
10.912
10.647
公 制 细 螺 纹
规格
标准径
2级牙钻孔径
最大
最小
M12×1.0
11.00
11.153
10.917
M12×0.5
11.50
11.520
11.4
M14×1.5
12.50
12.676
12.376
M14×1.0
13.00
13.153
12.917
M15×1.5
13.50
13.676
13.376
M15×1.0
14.00
14.153
13.917
M16×1.5
14.50
14.676
14.376
M16×1.0
15.00
15.153
14.917
M17×1.5
15.50
15.676
15.376
M17×1.0
16.00
16.153
15.917
M18×2.0
16.00
16.210
15.835
M18×1.5
16.50
16.670
16.376
M18×1.0
17.00
17.153
16.917
M20×2.0
18.00
18.210
17.835
M20×1.5
18.50
18.676
18.376
M20×1.0
19.00
19.153
18.917
M20×2.0
20.00
20.210
19.835
M22×1.5
20.50
20.676
20.376
M22×1.0
21.00
21.153
20.917
M24×2.0
22.00
22.210
21.835
M24×1.5
22.50
22.676
22.376
M24×1.0
23.00
23.153
22.917
M25×2.0
23.00
23.210
22.835
M25×1.5
23.50
23.676
23.376
M25×1.0
24.00
24.153
23.917
M26×1.5
24.50
24.676
24.376
M27×2.0
25.00
25.210
24.835
M27×1.5
25.50
25.676
25.376
M27×1.0
26.00
26.153
25.917
M28×2.0
26.00
26.210
25.835
M28×1.5
26.50
26.676
26.376
M28×1.0
27.00
27.153
26.917
M30×3.0
27.00
27.252
26.752
M30×2.0
28.00
28.210
27.835
M30×1.5
28.50
28.676
28.376
M30×1.0
29.00
29.153
28.917
M32×2.0
30.00
30.210
29.835
M32×1.5
30.50
30.676
30.376
M33×3.0
30.00
30.252
29.752
M33×2.0
31.00
31.210
30.835
M33×1.5
31.50
31.376
31.376
M35×1.5
33.50
33.676
33.376
M36×3.0
33.00
33.252
32.752
M36×2.0
34.00
34.210
33.835
M36×1.5
34.50
34.676
34.376
美 制 细 螺 纹
规格(UNF)
标准径
2级牙钻孔径
最大
最小
番数牙外径
NO.0-80(1.524)
1.25
1.305
1.182
NO.1-72(1.854)
1.55
1.612
1.474
NO.2-64(2.184)
1.85
1.912
1.756
NO.3-56(2.515)
2.10
2.197
2.025
NO.4-48(2.845)
2.40
2.458
2.271
NO.5-44(3.175)
2.70
2.740
2.551
NO.6-40(3.505)
2.90
3.022
2.820
NO.8-36(4.166)
3.50
3.606
3.404
NO.10-32(4.826)
4.10
4.165
3.963
NO.12-28(5.846)
4.60
4.724
4.496
1/4 -28
5.50
5.588
5.360
5/16 -24
6.90
7.035
6.782
3/8 -24
8.50
8.636
8.382
7/16 -20
9.90
10.033
9.729
1/2 -20
11.50
11.607
11.329
9/16 -18
12.90
13.081
12.751
5/8 -18
14.50
14.681
14.351
3/4 -16
17.50
14.678
17.323
7/8 -14
20.50
20.675
20.270
1 -12
23.20
23.571
23.114
1-1/8 -12
26.50
26.746
26.289
1-1/4 -12
29.50
29.921
29.464
1-3/8 -12
32.80
33.096
32.464
1-1/2 -12
36.00
36.270
35.814
无 屑 丝 攻 钻 孔 径
规格
精度等级
RH4.5.6
RH7.8
RH9
M1.0×0.25
0.86
0.88
-
M1.1×0.25
0.96
0.98
-
M1.2×0.25
1.06
1.08
-
M1.4×0.3
1.24
1.25
-
M1.6×0.35
1.41
1.43
-
M1.7×0.35
1.51
1.53
-
M1.8×0.35
1.61
1.63
-
M2.0×0.4
1.78
1.80
-
M2.2×0.45
1.95
1.98
-
M2.3×0.4
2.08
2.10
-
M2.5×0.45
2.25
2.28
-
M2.6×0.45
2.35
1.38
-
M3.0×0.5
2.73
2.75
-
M3.0×0.6
3.17
3.20
-
M4.0×0.7
3.62
3.65
3.69
M5.0×0.8
4.56
4.60
4.64
M6.0×1.0
5.45
5.50
5.55
M7.0×1.0
6.45
6.50
6.55
M8.0×1.25
7.31
7.38
7.44
M10×1.5
9.18
9.25
9.32
M10×1.25
9.31
9.38
9.44
M12×1.75
11.04
11.12
11.21
M12×1.25
11.31
11.38
11.44
美 制 管 螺 纹
规格(UNEF)
标准径
2级牙钻孔径
最大
最小
NO.12 -32
4.70
4.826
4.623
1/4 -32
5.60
5.690
5.486
5/16 -32
7.10
7.264
7.087
3/8 -32
8.70
8.865
8.661
7/16 -28
10.20
10.338
10.135
1/2 -28
11.80
11.938
11.709
9/16 -28
13.20
13.386
13.132
5/8 -24
14.80
14.986
14.732
3/4 -20
17.80
17.958
17.678
7/8 -20
21.00
21.133
20.853
1 -20
24.00
24.308
24.028
美 制 粗 螺 纹
规格(UNC)
标准径
2级牙钻孔径
番数牙外径
最大
最小
NO.1-64(1.854)
1.55
1.582
1.425
NO.2-56(2.184)
1.80
1.871
1.695
NO.3-48(2.515)
2.10
2.146
1.941
NO.4-40(2.845)
2.30
2.385
2.157
NO.5-40(3.175)
2.60
2.697
2.487
NO.6-32(3.505)
2.80
2.895
2.642
NO.8-32(4.166)
3.40
3.530
3.302
NO.10-24(4.826)
3.90
3.962
3.682
NO.12-24(5.846)
4.50
4.597
4.344
1/4 -20
5.10
5.257
4.979
5/16 -18
6.60
6.731
6.401
3/8 -16
8.00
8.153
7.987
7/16 -14
9.40
9.500
9.144
1/2 -13
10.80
11.023
10.592
9/16 -12
12.20
12.446
11.989
5/8 -11
13.60
12.868
13.386
3/4 -10
16.20
16.840
16.307
7/8 -9
19.50
19.761
19.177
1 -8
22.20
22.606
21.971
1-1/8 -7
25.00
25.349
24.638
1-1/4 -7
28.20
28.524
27.813
1-3/8 -6
30.80
31.115
30.353
1-1/2 -6
34.00
34.290
33.528
1-3/4 -5
39.50
39.827
38.964
2 -4-1/2
45.20
45.593
44.679
英制螺纹
规格
钻孔径
硬材
软材
W1/8 - 40
2.65
2.60
W5/32 - 32
3.25
3.20
W3/16 - 24
3.75
3.70
W1/4 - 20
5.10
5.00
W5/16 - 18
6.60
6.50
W3/8 - 16
8.00
7.90
W7/16 - 14
9.40
9.30
W1/2 - 12
10.70
10.50
W9/16 - 12
12.30
12.00
W5/8 - 11
13.70
13.50
W3/4 - 10
16.70
16.50
W7/8 - 9
19.50
19.30
W1 - 8
22.40
22.00
W1-1/8 - 7
25.00
24.80
W1-1/4 - 7
28.30
28.00
英制管螺纹
规格
标准径
钻孔径
最大
最小
PS1/16 -28
6.50
6.632
6.490
PS1/8 -28
8.50
8.637
8.495
PS1/4 - 19
11.40
11.549
11.341
PS3/8 - 19
15.00
15.054
14.846
PS1/2 - 14
18.50
18.773
18.489
PS3/4 - 14
24.00
24.259
23.975
PS1 - 11
30.20
30.471
30.111
PS1-1/4 -11
38.80
39.132
38.772
PS1-1/2 -11
44.80
45.025
44.665
PS2 - 11
56.50
56.836
56.476
英制管螺纹
规格
标准径
有效牙部之长度(最小)中
之母螺牙内径
标准长度(最小)中
之母螺牙内径
使用绞刀时
不用绞刀时
PT1/16 -28
6.10
6.2
6.244
6.384
PT1/8 -28
8.10
8.2
8.249
8.388
PT1/4 -19
10.70
11
10.962
11.174
PT3/8 -19
14.20
14.5
14.448
14.658
PT1/2 -14
17.60
18
17.979
18.263
PT3/4 -14
23.00
23.5
23.378
23.663
Pt1 -11
29.00
29.5
29.459
29.822
PT1-1/4 -11
37.50
38
37.976
38.339
PT1-1/2 -11
43.40
44
43.869
44.232
Pt2 -11
54.90
55.5
55.412
55.844
美制螺纹滚造径
规格
钻孔径
NPT
NPS
使用绞刀时
不用绞刀时
1/16 -27
6.1
6.25
6.35
1/8 -27
8.33
8.43
8.74
1/4 -18
10.72
11.13
11.13
3/8 -18
14.27
14.27
14.68
1/2 -14
17.48
17.86
18.26
3/4 -14
22.63
23.01
23.42
1 -11-1/2
28.58
28.98
29.36
1-1/4-11-1/2
37.31
37.69
38.1
1-1/2-11-1/2
43.66
44.04
44.45
2 -11-1/2
55.58
55.96
56.36
英制螺纹滚造径
规格
滚造径
W 3/16 - 24
4.08 - 4.05
W 1/4 - 20
5.51 - 5.46
W 5/16 - 18
7.01 - 6.95
W 3/8 - 16
8.48 - 8.41
W 7/16 - 14
9.92 - 9.85
W 1/2 - 12
11.31 - 11.24
W 9/16 -12
12.89 - 12.82
公制螺纹
规格
滚造径
M3.0×0.6
2.56 2.53
M3.5×0.6
3.06 3.03
M4.0×0.7
3.49 3.45
M4.0×0.75
3.45 3.41
M4.5×0.75
3.96 3.92
M5.0×0.8
4.43 4.38
M5.0×0.9
4.36 4.31
M6.0×1.0
5.30 5.25
M7.0×1.0
6.30 6.25
M8.0×1.0
7.28 - 7.23
M8.0×1.25
7.12 - 7.07
M9.0×1.25
8.12 - 8.07
M10×1.25
9.10 - 9.04
M10×1.5
8.97 - 8.91
M11×1.5
9.97 - 9.91
M12×1.5
10.92 - 10.87
M12×1.75
10.79 - 10.73
M14×2.0
12.63 - 12.56
M16×2.0
14.63 - 14.56
M18×2.5
16.31 - 16.23
M20×2.5
18.31 - 18.23
M22×2.5
20.31 - 20.23
针车用螺纹
规格(UNC)
滚造径
SM 1/8 40
2.735 -2.688
SM 1/8 44
2.769 -2.722
SM 9/64 40
3.128 -3.083
SM 11/64 40
3.855 -3.805
SM 3/16 32
4.205 -4.155
SM 3/16 28
4.143 -4.093
SM 7/32 32
5.003 -4.955
SM 15/64 28
5.325 -4.955
SM 1/4 40
5.890 -5.735
SM 1/4 28
5.721 -5.366
SM 9/32 28
6.528 -6.648
SM 11/32 28
8.092 -8.432
SM 3/8 29
8.880 -8.015
SM 7/16 30
10.466 -10.401
SM 7/16 16
10.037 -9.967
SM 1/2 20
11.819 -11.749
SM 9/16 20
13.400 -13.425
美制粗螺纹
规格(UNC)
滚造径
NO.5-40
2.70 - 2.67
NO.6-32
2.95 - 2.91
NO.8-32
3.60 - 3.57
NO.10-24
4.09 - 4.05
NO.12-24
4.75 - 4.70
1/4 -20
5.50 - 5.45
5/16 -18
6.98 - 6.93
3/8 -16
8.45 - 8.40
7/16 -14
9.89 - 9.83
1/2 -13
11.39 - 11.32
9/16 -12
12.87 - 12.80
美制细螺纹
规格(UNF)
滚造径
NO.5-44
2.73 - 2.70
NO.6-40
3.05 - 3.02
NO.8-36
3.66 - 3.63
NO.10-32
4.26 - 4.80
NO.12-28
4.84 - 4.80
1/4 -28
5.72 - 5.68
5/16 -24
7.20 - 7.16
3/8 -24
8.79 - 8.74
7/16 -20
10.23 - 10.18
1/2 -20
11.82 - 11.76
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