材质 
M12
1.5
24
23.5
14
13
3
2
17
16.73
M14
1.5
27
26.5
16
15
3.5
2.5
19
18.67
M18
1.5
29
28.5
19
18
4.5
3.5
24
23.67
M20
1.5
34
33.5
21
20
5.5
4.5
27
26.67
M22
1.5
36
35.5
23
22
6.5
5.5
30
29.67