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螺絲攻牙鉆孔徑對照表
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公制粗螺紋
公制細螺紋
規(guī)格
標(biāo)準(zhǔn)徑
2級鉆孔徑
*大
*小
M1.0 0.25
0.75
0.785
0.729
M12 1.0
11
11.153
10.917
M1.1 0.25
0.85
0.885
0.829
M12 0.5
11.5
11.52
11.4
M1.2 0.25
0.95
0.985
0.929
M14 1.5
12.5
12.676
12.376
M1.4 0.3
1.1
1.142
1.075
M14 1.0
13
13.153
12.917
M1.6 0.35
1.25
1.321
1.221
M15 1.5
13.5
13.676
13.376
M1.7 0.35
1.35
1.421
M15 1.0
14
14.153
13.917
M1.8 0.35
1.45
1.521
M16 1.5
14.5
14.676
14.376
M2.0 0.4
1.6
1.679
1.567
M16 1.0
15
15.153
14.917
M2.2 0.45
1.75
1.838
1.713
M17 1.5
15.5
15.676
15.376
M2.3 0.4
1.9
1.979
1.867
M17 1.0
16
16.153
15.917
M2.5 0.45
2.1
2.138
2.013
M18 2.0
16.21
15.835
M2.6 0.45
2.2
2.238
2.113
M18 1.5
16.5
16.676
16.376
M3.0 0.5
2.5
2.599
2.459
M18 1.0
17
17.153
16.917
M3.5 0.6
2.9
3.01
2.85
M20 2.0
18
18.21
17.835
M4.0 0.7
3.3
3.422
3.242
M20 1.5
18.5
18.676
18.376
M4.5 0.75
3.8
3.878
3.688
M20 1.0
19
19.153
18.917
M5.0 0.8
4.2
4.334
4.134
M22 2.0
20
20.21
19.835
M6.0 1.0
5
5.153
4.917
M22 1.5
20.5
20.676
20.376
M7.0 1.0
6
6.153
5.917
M22 1.0
21
21.153
20.917
M8.0 1.25
6.8
6.912
6.647
M24 2.0
22
22.21
21.835
M9.0 1.25
7.8
7.912
7.647
M24 1.5
22.5
22.676
22.376
M10 1.5
8.5
8.676
8.376
M24 1.0
23
23.153
22.917
M11 1.5
9.5
9.676
9.376
M25 2.0
23.21
22.835
M12 1.75
10.3
10.441
10.106
M25 1.5
23.5
23.676
23.376
M14 2.0
12
12.21
11.835
M25 1.0
24
24.153
23.917
M16 2.0
14.21
13.835
M26 1.5
24.5
24.676
24.376
M18 2.5
15.744
15.294
M27 2.0
25
25.21
24.835
M20 2.5
17.5
17.744
17.294
M27 1.5
25.5
25.676
25.376
M22 2.5
19.5
19.744
19.294
M27 1.0
26
26.153
25.917
M24 3.0
21.252
20.752
M28 2.0
26.21
25.835
M27 3.0
24.252
23.752
M28 1.5
26.5
26.676
26.378
M30 3.5
26.771
26.211
M28 1.0
27
27.153
26.917
M33 3.5
29.5
29.771
29.211
M30 3.0
27.252
26.752
M36 4.0
32
32.27
31.67
M30 2.0
28
28.21
27.835
M39 4.0
35
35.27
34.67
M30 1.5
28.5
28.676
28.376
M30 1.0
29
29.153
28.917
M32 2.0
30
30.21
29.835
M32 1.5
30.5
30.676
30.376
M33 3.0
30.252
29.752
M1.0 0.2
0.8
0.821
0.783
M33 2.0
31
31.21
30.835
M1.1 0.2
0.9
0.921
0.883
M33 1.5
31.5
31.676
31.376
M1.2 0.2
1
1.021
0.983
M35 1.5
33.5
33.676
33.376
M1.4 0.2
1.2
1.183
M36 3.0
33
33.252
32.752
M1.6 0.2
1.4
1.383
M36 2.0
34
34.21
33.835
M1.7 0.2
1.5
1.46
M36 1.5
34.5
34.676
34.376
M1.8 0.2
1.621
1.583
M2.0 0.25
1.785
1.729
美制細螺紋
M2.2 0.25
1.95
1.985
1.929
規(guī)格（UNF)
2級牙鉆孔徑
M2.3 0.25
2.05
2.061
2.001
M2.5 0.35
2.221
2.121
螺紋牙外徑
M2.6 0.35
2.246
2.186
N.o-80(1.524)
1.305
1.182
M3.0 0.35
2.7
2.721
2.621
No.1-72(1.854)
1.55
1.612
1.474
M3.5 0.35
3.2
3.221
3.121
No.2-64(2.184)
1.85
1.912
1.756
M4.0 0.5
3.5
3.599
3.459
No.3-56(2.515)
2.197
2.025
M4.5 0.5
4
4.099
3.959
No.4-48(2.845)
2.4
2.458
2.271
M5.0 0.5
4.5
4.599
4.459
No.5-44(3.175)
2.74
2.551
M5.5 0.5
5.099
4.959
No.6-40(3.505)
3.022
2.82
M6.0 0.75
5.3
5.378
5.188
No.8-36(4.166)
3.606
3.404
M6.0 0.5
5.5
5.55
5.4
No.10-32(4.826)
4.1
4.165
3.963
M7.0 0.75
6.3
6.378
6.188
No.12-28(5.486)
4.6
4.724
4.496
M7.0 0.5
6.5
6.55
6.4
1/4 - 28
5.588
5.36
M8.0 1.0
7
7.153
6.917
5/16 -24
6.9
7.035
6.782
M8.0 0.75
7.3
7.378
7.188
3/8 -24
8.635
8.382
M8.0 0.5
7.5
7.52
7.4
7/16 -20
9.9
10.033
9.729
M9.0 1.0
8
8.153
7.917
1/2 -20
11.607
11.329
M10 1.25
8.8
8.912
8.647
9/16 -18
12.9
13.081
12.751
M10 1.0
9
9.153
8.917
5/8 -18
14.681
14.351
M10 0.75
9.3
9.378
9.188
3/4 -16
17.678
17.323
M10 0.5
9.52
9.4
7/8 -14
20.675
20.27
M11 1.0
10
10.153
9.917
1 -12
23.3
23.571
23.114
M11 0.75
10.378
10.188
1-1/8 -12
26.746
26.289
M12 1.5
10.5
10.676
10.376
1-1/4 -12
29.6
29.921
29.464
M12 1.25
10.8
10.921
10.647
1-3/8 -12
32.8
33.096
32.639
1-1/2 -12
36
36.271
35814
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