材质 
M12
1.75
15.2
12
11.3
23.91
8.45
7.55
1.2
22
21.16
M16
2
19.2
16
15.3
29.56
10.75
9.25
1.2
27
26.16
M20
2.5
24
20
19.16
35.03
13.9
12.1
1.5
32
31
M22
2.5
26
22
21.16
39.55
14.9
13.1
1.5
36
35
M24
3
28
24
23.16
45.2
15.9
14.1
1.5
41
40
M27
3
32
27
26.16
50.85
17.9
16.1
2
46
45
M30
3.5
35
30
29.16
55.37
20.05
17.95
2
50
49
M36
4
41
36
35
66.44
24.05
21.95
2
60
58.8