材质 
M3
0.35|0.5
2
5.5
M3.5
0.35|0.6
2.4
6
M4
0.5|0.7
2.8
7
M5
0.5|0.8
3.5
8
M6
0.75|1|0.5
4
10
M8
1|1.25|0.75|0.5
5.5
13