材质 
M5
0.8
10
4
5
4.52
2
1.8
4.48
2.5
M6
1
12
5
6
5.52
2.5
2
5.35
3
M8
1.25
16
6
8
7.42
3
2.3
7.19
4
M10
1.5
20
7
10
9.42
3.2
2.7
9.03
5
M12
1.75
24
9.2
12
11.3
3.6
3.2
10.86
6
M16
2
32
11.2
16
15.3
4.2
3.5
14.70
8
M20
2.5
40
16
20
19.16
4.7
4
18.38
10