材质 
M12
1.75
15.2
12.7
11.3
22
8.8
7.2
1.2
8
7.4
8.36
16
M16
2
18.83
16.43
15.57
30
10.75
9.25
1.2
11.3
11
12.8
17
M20
2.5
24.4
20.52
19.48
37
13.9
12.1
1.2
14.1
13.8
16.1
19
M22
2.5
26.4
22.52
21.48
41
14.9
13.1
1.2
15.6
15.3
17.8
21
M24
3
28.4
24.52
23.48
44
15.9
14.1
1.6
16.9
16.6
19.3
23
M27
3
32.84
27.84
26.16
50
17.9
16.1
2
19.3
18.7
21.9
24
M30
3.5
35.84
30.84
29.16
55
20.05
17.95
2
21.4
20.8
24.4
25
M36
4
42.4
37
35
67
24.05
21.95
2
25.7
25.1
29.36
33