材质 
M3
0.5
2
1.86
5
4.82
4.5
4.32
0.1
1
M4
0.7
2.8
2.66
8
7.78
6.5
6.32
0.2
1.5
M5
0.8
3.5
3.32
9
8.78
7
6.78
1.2
1.5
M6
1
4.5
4.32
11
10.73
10
9.64
1.4
2
M8
1.25
5.5
5.32
14
13.73
12
11.57
1.9
2.5
M10
1.5
7
6.78
17
16.73
13.5
13.07
2.4
2.5