材质 
M5
0.8
8.79
5.3
4.8
8
7.78
M6
1
11.05
6.7
5.4
10
9.78
M8
1.25
14.38
8
7.14
13
12.73
M10
1.5
17.77
10.5
8.94
16
15.73
M12
1.75
20.03
13.3
11.57
18
17.73
M14
2
23.36
15.4
13.4
21
20.67
M16
2
26.75
17.9
15.7
24
23.67
M20
2.5
32.95
21.8
19
30
29.16
M24
3
39.55
26.4
22.6
36
35
M30
3.5
50.85
31.8
27.3
46
45
M36
4
60.79
38.5
33.1
55
53.8