材质 
M6
1
16
14.9
6
5.35
7.2
4.6
3.4
3.6
3
0.5
6.48
5.52
M8
1.25
20
18.7
8
7.19
9.6
5.6
4.4
4.8
4
0.8
8.58
7.42
M10
1.5
24
22.7
10
9.03
12.2
6.6
5.4
5.8
5
0.8
10.58
9.42
M12
1.75
30
28.7
12
10.86
14.7
8.8
7.2
6.8
6
1.2
12.7
11.3