材质 
M12
1.75
12.7
11.3
10.95
10.68
7
6
21
20.16
24.25
22.78
7.95
7.24
13.7
0.6
M14
2
14.7
13.3
12.77
12.5
8
7
24
23.16
27.71
26.17
9.25
8.51
15.7
0.6
M16
2
16.7
15.3
14.77
14.5
9
8
27
26.16
31.18
29.56
10.75
9.68
17.7
0.6
M20
2.5
20.84
19.16
18.49
18.16
11
10
34
33
39.26
37.29
13.4
12.12
22.4
0.8
M24
3
24.84
23.16
22.13
21.8
13
12
41
40
47.34
45.2
15.9
14.56
26.4
0.8