材质 
M5
0.8
4.7
4.5
10
1
3
2.7
10
9
8.5
M6
1
5.7
5.5
12
1.6
4
3.5
13
10
9.5
M8
1.25
7.7
7.5
16
1.6
6
5.5
18
13
12.5
M10
1.5
9.7
9.5
20
1.6
6
5.5
21
15
14.5
M12
1.75
11.7
11.4
25
2.5
7
6.5
25
18
17.5