材质 
M2
0.4
2.53
2.7
1.2
1.6
M2.5
0.45
3.2
3.7
1.5
2
M3
0.5
3.8
4.35
1.8
2.4
M4
0.7
5.06
5.6
2.4
3.2
M5
0.8
6.25
6.8
2.9
4
M6
1
7.58
7.95
3.5
4.8
M7
1
8.58
9.2
4
5.5
M8
1.25
9.85
10.35
4.7
6.3
M10
1.5
12.1
12.8
5.8
7.9
M12
1.75
14.5
15
6.9
9.5
M14
2
16.87
17.87
8.1
11
M16
2
18.87
19.9
9.1
12.5
M18
2.5
21.4
22
10.4
14.2
M20
2.5
23.46
24.4
11.4
15.7
M22
2.5
25.61
26.9
12.4
17.2
M24
3
28.15
29.1
13.6
18.8
M27
3
31.15
32.4
15.1
21.1
M30
3.5
34.7
35.81
16.9
23.4
M33
3.5
37.7
39.01
18.4
25.7
M36
4
41.33
42.67
20.2
28.1
M39
4
44.33
45.75
21.7
30.3