材质 
M5
0.8
10
8.5
5.48
4.52
3.2
1.3
M6
1
12
10.2
6.48
5.52
3.8
1.5
M8
1.25
16
13.6
8.58
7.42
5
2
M10
1.5
20
17
10.58
9.42
6.3
2.5
M12
1.75
24
20.4
12.7
11.3
7.5
3
M16
2
32
27.2
16.7
15.3
10
4
M20
2.5
40
34
20.84
19.16
12.5
5
M24
3
48
40.8
24.84
23.16
15
6