材质 
M12
1.75
8.5
8.5
10
4.5
M16
2
12
12
13.5
5
M20
2.5
15
15
16.5
7
M24
3
18
18
20
8
M27
3
20.5
21
22.5
8
M30
3.5
23
23
25
9.5
M33
3.5
25.5
26
27.5
9.5
M36
4
27.5
28
30
10.5
M39
4
30.5
31
32.5
10.5
M42
4.5
32.5
33
35
12
M45
4.5
35.5
36
37.5
12
M48
5
37.5
38
39.5
13
M52
5
41
42
43.5
13
M56
5.5
44
45
46.5
14.5