材质 
M16
2
16
27
12
29.9
1.5
2
M18
2.5
18
30
13
33.3
1.5
2
M20
2.5
20
32
14
35
1.5
2
M22
2.5
22
36
15
39.6
2
2.5
M24
3
24
41
17
45.2
2
2.5
M27
3
27
46
19
50.9
2
2.5
M30
3.5
30
46
19
50.9
3
4
M36
4
36
55
23
60.8
3
4
M42
4.5
42
65
26
72.1
3
4
M48
5
48
75
30
83.4
4
5