材质 
M1.4
0.3
0.8
0.724
0.71
1.4
M1.6
0.35
0.8
0.724
0.71
1.5
M1.8
0.35
0.8
0.721
0.71
1.6
M2
0.4
1.05
0.9125
0.8875
1.6
M2.5
0.45
1.5
1.325
1.3
2
M3
0.5
1.8
1.545
1.52
2
M4
0.7
2.3
2.045
2.02
2.5
M5
0.8
2.9
2.56
2.52
3
M6
1
3.5
3.06
3.02
3.5
M8
1.25
4.7
4.068
4.02
5
M10
1.5
5.8
5.068
5.02
6
M12
1.75
7
6.095
6.02
8
M14
2
7
6.095
6.02
8
M16
2
9.4
8.115
8.025
10
M18
2.5
11.7
10.115
10.025
12
M20
2.5
11.7
10.115
10.025
12
M22
2.5
14
12.142
12.032
15
M24
3
14
12.142
12.032
15