材质 
M12
1.75
24
23.16
12.7
11.3
8.75
7.25
3
2.5
16.5
15.5
4.5
3
M14
2
28
27.16
14.7
13.3
9.75
8.25
3
2.5
19.5
18.5
4.5
3
M16
2
32
31.16
16.7
15.3
10.75
9.25
3
2.5
22.5
21.5
4.5
3
M18
2.5
36
35
18.7
17.3
12.9
11.1
3.5
3
25.5
24.5
5
3.5
M20
2.5
40
39
20.84
19.16
13.9
12.1
3.5
3
28.5
27.5
5
3.5
M22
2.5
44
43
22.84
21.16
14.9
13.1
3.5
3
30.5
29.5
5
3.5
M24
3
48
47
24.84
23.16
16
15.1
3.5
3
33.5
32.5
5
3.5
M27
3
54
53
27.84
26.16
18.4
16.6
3.5
3
37.5
36.5
5
3.5
M30
3.5
60
58.8
30.84
29.16
20.55
18.45
4
3.5
42.5
41.5
5.5
4
M36
4
72
70.8
37
35
24.05
21.95
4
3.5
50.5
49.5
5.5
4