材质 
M16
2
16.7
15.3
4
2.5
12.5
12
27
26.16
31.2
29.3
10.45
9.55
M20
2.5
20.84
19.16
5
3.5
15.7
15.2
32
31
36.9
35.03
13.9
12.1
M22
2.5
22.84
21.16
5.5
4
17.6
17.1
36
35
41.6
39.55
14.9
13.1
M24
3
24.84
23.16
6
4.5
18.85
18.35
41
40
47.3
45.2
15.9
14.1
M27
3
27.84
26.16
6.75
5.25
21.65
21.15
46
45
53.1
50.85
17.9
16.1
M30
3.5
30.84
29.16
7.5
6
23.85
23.35
50
49
57.7
55.37
20.05
17.95
M33
3.5
34
32
8.25
6.75
26.75
26.25
55
53.8
63.5
60.79
22.05
19.95