材质 
M4
0.7
4.7
4.5
9
8.5
6.5
3
2.7
M5
0.8
5.7
5.5
10
9.5
8
4
3.5
M6
1
7.7
7.5
13
12.5
10
6
5.5
M8
1.25
9.7
9.5
15
14.5
12
6
5.5
M10
1.5
11.7
11.4
18
17.5
14
7
6.5
M12
1.75
13.7
13.4
22
21.5
16
8
7.5
M16
2
17.7
17.4
28
27.5
20
10
9.5
M20
2.5
21.7
21.4
35
34.5
28
14
13.5
M24
3
27.7
27.4
44
43
36
18
17
M30
3.5
35.6
35.3
54
53
44
22
21
M36
4
41.6
41.3
65
64
52
26
25
M42
4.5
47.6
47.3
75
74
60
30
29
M48
5
53.6
53.2
85
84
70
34
33