材质 
M2
0.4
3.4
4.60
2
M2.5
0.45
4.4
5.60
2
M3
0.5
5.4
6.60
3
M4
0.7
7.25
8.75
4
M5
0.8
9.25
10.75
4
M6
1
11.1
12.90
5
M8
1.25
15.1
16.90
7
M10
1.5
18.95
21.05
9
M12
1.75
22.95
25.05
11
M14
2
26.95
29.05
13
M16
2
31.75
33.25
15
M18
2.5
34.75
37.25
16
M20
2.5
38.75
41.25
18
M22
2.5
42.75
45.25
20
M24
3
46.75
49.25
22
M27
3
52.5
55.50
25
M30
3.5
58.5
61.50
28
M33
3.5
64.5
67.50
31
M36
4
70.5
73.50
33
M39
4
76.5
79.50
36
M42
4.5
82.25
85.75
39
M48
5
94.25
97.75
45