材质 
M6
1
13.1
11.3
6
5.35
3.4
2.6
4.08
3.2
0.5
6.3
5.84
M8
1.25
17.1
15.3
8
7.19
3.4
2.6
5.28
4.4
0.5
8.36
7.8
M10
1.5
21.3
19.16
10
9.03
4.4
3.6
6.48
5.6
0.5
10.36
9.8
M12
1.75
25.3
23.16
12
10.86
5.4
4.6
8.9
7.55
0.8
12.43
11.76