材质 
M12
1.75
23
21
22
21.16
15.2
12.7
11.3
23.91
8.45
7.55
1.2
M14
2
25
23
24
23.16
17.2
14.7
13.3
27.34
9.75
8.25
1.2
M16
2
28
26
27
26.16
19.2
16.7
15.3
29.56
10.75
9.25
1.2
M18
2.5
30
28
30
29.16
21.2
18.7
17.3
34.27
12.9
11.1
1.2
M20
2.5
33
31
32
31
24
20.84
19.16
35.03
13.9
12.1
1.5
M22
2.5
34
32
36
35
26
22.84
21.16
39.55
14.9
13.1
1.5
M24
3
37
34
41
40
28
24.84
23.16
45.2
15.9
14.1
2
M27
3
39
37
46
45
32
27.84
26.16
50.85
17.9
16.1
2