材质 
M3
0.5
3.6
2.6
5.98
2.2
1.8
0.1
5.5
5.2
M4
0.7
4.7
3.5
7.5
3
2.6
0.2
7
6.64
M5
0.8
5.7
4.4
8.63
3.74
3.26
0.2
8
7.64
M6
1
6.8
5.3
10.89
4.24
3.76
0.25
10
9.64
M8
1.25
9.2
7.1
14.2
5.54
5.06
0.4
13
12.57
M10
1.5
11.2
8.9
17.59
6.69
6.11
0.4
16
15.57
M12
1.75
13.7
10.7
19.85
7.79
7.21
0.6
18
17.57
M14
2
15.7
12.5
22.78
9.09
8.51
0.6
21
20.16
M16
2
17.7
14.5
26.17
10.29
9.71
0.6
24
23.16
M20
2.5
22.4
18.2
32.95
12.85
12.15
0.8
30
29.16