材质 
M6
1
14.2
6
5.35
7.64
3
2.4
3.6
3
0.5
6.48
5.88
M8
1.25
18
8
7.19
10.2
3
2.4
4.8
4
0.8
8.58
7.85
M10
1.5
22.3
10
9.03
12.8
4
3.2
5.8
5
0.8
10.58
9.85
M12
1.75
26.6
12
10.86
15.37
4
3.2
6.8
6
1.2
12.7
11.82
M16
2
35
16
14.70
20.57
5
4.2
8.9
8
1.2
16.7
15.82
M20
2.5
43
20
18.38
25.73
5
4.2
10.9
10
1.6
20.84
19.79