材质 
M12
1.75
14.7
12.7
11.3
23.7
8.45
7.55
0.6
22
21.16
M16
2
18.7
16.7
15.3
29.3
10.45
9.55
0.6
27
26.16
M20
2.5
23.24
20.84
19.16
35.03
13.9
12.1
0.8
32
31
M22
2.5
25.24
22.84
21.16
39.55
14.9
13.1
0.8
36
35
M24
3
27.24
24.84
23.16
45.2
15.9
14.1
0.8
41
40
M27
3
30.84
27.84
26.16
50.85
17.9
16.1
1
46
45
M30
3.5
33.84
30.84
29.16
55.37
20.05
17.95
1
50
49
M36
4
40
37
35
66.44
24.05
21.95
1
60
58.8