材质 
M8
1.25
12
11.76
6.24
5.76
13.8
M10
1.5
14
13.76
8.29
7.71
16.2
M12
1.75
17
16.76
10.29
9.71
19.6
M14
2
19
18.72
11.35
10.65
21.9
M16
2
22
21.72
13.35
12.65
25.4
M18
2.5
24
23.72
14.35
13.65
27.7
M20
2.5
27
26.72
16.35
15.65
31.2
M22
2.5
30
29.72
18.35
17.65
34.6
M24
3
32
31.66
19.42
18.58
36.9
M27
3
36
35.66
22.42
21.58
41.6
M30
3.5
41
40.66
24.42
23.58
47.3
M36
4
50
49.66
28.42
27.58
53.1
M42
4.5
55
54.6
33.5
30.5
63.5
M48
5
65
64.6
39.5
36.5
75