材质 
M5
0.8
3.5
3.2
6
4.85
5.15
0.2
4.82
5
M6
1
4
3.7
7.3
5.85
6.15
0.25
5.82
6
M8
1.25
5.5
5.2
9.7
6.82
7.18
0.4
7.78
8
M10
1.5
7
6.64
12.2
7.82
8.18
0.5
9.78
10
M12
1.75
8.5
8.14
14.7
9.82
10.18
0.6
11.73
12
M16
2
12
11.57
20.9
13.785
14.215
0.6
16.73
17
M20
2.5
15
14.57
27.1
17.785
18.215
0.8
21.67
22