材质 
M16
2
16
27
26.16
12.35
11.65
29.9
19
0.6
M18
2.5
18
30
29
13.35
12.65
33.3
21
1.2
M20
2.5
20
34
33
14.35
13.65
35
24
1.2
M22
2.5
22
36
35
15.35
14.65
39.6
26
1.6
M24
3
24
41
40
17.35
16.65
45.2
28
1.6
M27
3
27
46
45
19.42
18.58
50.9
31
1.6
M30
3.5
30
50
49
19.42
18.58
50.9
35
2
M36
4
36
60
58.8
23.42
22.58
60.8
41
2
M42
4.5
42
65
63.1
26.42
25.58
72.1
47
2
M48
5
48
75
73.1
30.42
29.58
83.4
53
2