材质 
M5
0.8
11.3
10.2
5.48
4.52
3.1
2.5
3.1
2.5
0.5
5
M6
1
13.5
12.4
6.48
5.52
3.6
3
3.6
3
0.5
6
M8
1.25
18
16.9
8.58
7.42
4.8
4
4.75
4
0.5
8
M10
1.5
22.5
21.2
10.58
9.42
5.8
5
5.75
5
0.5
10
M12
1.75
27
25.7
12.7
11.3
6.8
6
6.75
6
1
12
M16
2
36
34.4
16.7
15.3
8.9
8
8.9
8
1
16
M20
2.5
45
43.4
20.84
19.16
10
10
10.9
10
1
20
M24
3
54
52.1
24.84
23.16
13
12
13.1
12
1.5
24