材质 
M6
1
11.05
9.29
8.71
10
9.78
M8
1.25
14.38
12.35
11.65
13
12.73
M10
1.5
17.77
15.35
14.65
16
15.73
M12
1.75
20.03
18.35
17.65
18
17.73
M16
2
26.75
24.42
23.58
24
23.67
M20
2.5
33.53
30.42
29.58
30
29.67
M24
3
39.98
36.5
35.5
36
35.38
M30
3.5
51.28
45.5
44.5
46
45.38
M36
4
61.31
54.6
53.4
55
54.26
M42
4.5
72.61
63.6
62.4
65
64.26
M48
5
83.91
72.6
71.4
75
74.26