材质 
M8
1.25
12
11.76
5.24
4.76
13.8
M10
1.5
14
13.76
6.24
5.76
16.2
M12
1.75
17
16.76
7.29
6.71
19.6
M14
2
19
18.72
8.29
7.71
21.9
M16
2
22
21.72
8.29
7.71
25.4
M18
2.5
24
23.72
9.29
8.71
27.7
M20
2.5
27
26.72
9.29
8.71
31.2
M22
2.5
30
29.72
10.29
9.71
34.6
M24
3
32
31.66
12.29
11.71
36.9
M27
3
36
35.66
12.35
11.65
41.6
M30
3.5
41
40.66
14.35
13.65
47.3
M36
4
50
49.66
16.35
15.65
57.7
M42
4.5
55
54.6
18.35
17.65
63.5
M48
5
65
64.6
18.35
17.65
75