材质 
M12
1.75
8.5
8
8.5
10
7
4
4.5
M16
2
12
12
12
13.5
10
5
5
M20
2.5
15
14
15
16.5
11
6
7
M24
3
18
14
18
20
11
6
8
M27
3
20.5
18
21
22.5
13
6
8
M30
3.5
23
18
23
25
13
6
9.5
M33
3.5
25.5
25
26
27.5
22
9
9.5
M36
4
27.5
25
28
30
22
9
10.5
M39
4
30.5
28
31
32.5
24
10
10.5
M42
4.5
32.5
28
33
35
24
10
12
M45
4.5
35.5
32
36
37.5
27
11
12
M48
5
37.5
32
38
39.5
27
11
13
M52
5
41
36
42
43.5
30
12
13
M56
5.5
44
40
45
46.5
32
13
14.5