材质 
M8
1.25
13
12.73
16
14.41
10.8
M10
1.5
15
14.73
21
16.69
13.5
M12
1.75
18
17.73
23
20.11
16.3
M14
2
21
20.67
27
23.36
18.1
M16
2
24
23.67
30
26.78
19.9
M18
2.5
27
26.67
33
30.2
21.7
M20
2.5
30
29.67
37
33.62
23.5
M22
2.5
34
33.61
42
38.12
25.3
M24
3
36
35.61
47
40.4
27.1
M27
3
41
40.61
53
46.1
29.8
M30
3.5
46
45.61
58
51.8
32.5