材质 
M6
1
4
3.82
10
9.78
4
11
0.4
M8
1.25
5.5
5.32
13
12.73
5.5
14.4
0.5
M10
1.5
7
6.78
17
16.73
7
18.9
0.5
M12
1.75
9
8.78
19
18.67
8
21.1
0.6
M16
2
11
10.73
24
23.67
10
26.8
0.8
M20
2.5
14
13.73
30
29.67
13
33.6
0.8