材质 
M12
1.75
12.7
11.3
23.91
7.95
7.05
22
21.16
8
7.4
8.36
16
M16
2
16.7
15.3
29.56
10.75
9.25
27
26.16
11.3
11
12.8
17
M20
2.5
20.84
19.16
35.03
13.4
11.6
32
31
14.1
13.8
16.1
19
M22
2.5
22.84
21.16
39.55
14.9
13.1
36
35
15.6
15.3
17.8
21
M24
3
24.84
23.16
45.2
15.9
14.1
41
40
16.9
16.6
19.3
23
M27
3
27.84
26.16
50.85
17.9
16.1
46
45
19.3
18.7
21.9
24
M30
3.5
30.84
29.16
55.37
19.75
17.65
50
49
21.4
20.8
24.4
25
M36
4
37
35
66.44
23.55
21.45
60
58.8
25.7
25.1
29.36
33