材质 
M12
1.75
15.2
12.7
11.3
22.78
7.95
7.05
1.2
21
20.16
M16
2
19.2
16.7
15.3
29.56
10.75
9.25
1.2
27
26.16
M20
2.5
24.4
20.84
19.16
37.29
13.4
11.6
1.5
34
33
M22
2.5
26.4
22.84
21.16
39.55
14.9
13.1
1.5
36
35
M24
3
28.4
24.84
23.16
45.2
15.9
14.1
1.5
41
40
M27
3
32.4
27.84
26.16
50.85
17.9
16.1
2
46
45
M30
3.5
35.4
30.84
29.16
55.37
19.75
17.65
2
50
49
M36
4
42.4
37
35.00
66.44
23.55
21.45
2
60
58.8