材质 
M12
1.75
26.6
20.03
12
11.6
18
17.57
M14
2
30.5
23.35
14
13.3
21
20.16
M16
2
35
26.75
16
15.3
24
23.16
M18
2.5
39
29.56
18
17.1
27
26.16
M20
2.5
43
32.95
20
18.9
30
29.16
M22
2.5
47
37.29
22
20.7
34
33
M24
3
51
39.55
24
22.7
36
35
M27
3
57
45.2
26.7
25.4
41
40
M30
3.5
63
50.85
28.6
27.3
46
45
M33
3.5
70
55.37
32.5
30.9
50
49
M36
4
77
60.79
34.7
33.1
55
53.8
M39
4
83
66.44
37.5
35.9
60
58.8
M42
4.5
90
72.02
40.3
38.7
65
63.8