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JB/T 6687-1993
12-Point flange nuts
Nom
P
ds max
ds min
e min
k max
k min
s max
s min
h max
h min
dc max
dc min
M6
1
7.1
7.04
8.98
9.18
8.82
8
7.88
1.2
0.95
11
10.82
M8
1.25
9.4
9.34
11.23
11.21
10.79
10
9.85
1.4
1.15
13
12.82
M10
1.5
11.5
11.44
13.51
12.21
11.79
12
11.85
1.6
1.35
16.5
16.32
M12
1.75
13.5
13.43
15.75
17.21
16.79
14
13.82
2.5
2.25
21
20.79
M16
2
17.7
17.63
21.42
20.26
19.74
19
18.79
2.5
2.25
26.7
26.49
M20
2.5
21.9
21.82
27.12
23.26
22.74
24
23.79
3
2.75
31.2
30.95
M24
3
26
25.92
33.96
32.31
31.69
30
29.79
4.5
4.2
41.3
41.05
M27
3
29
28.92
36.2
34.31
33.69
32
31.75
4.5
4.2
41.3
41.05
M30
3
33
32.92
40.76
39.31
38.69
36
35.75
5.5
5.2
54
53.7
M33
3
36
35.9
46.46
41.31
40.69
41
40.75
5.5
5.2
54
53.7
M36
3
39
38.9
46.46
44.31
43.69
41
40.75
6.5
6.14
59
58.7
M39
3
43
42.9
52.16
49.31
48.69
46
45.75
7.5
7.14
63.5
63.2
M42
3
46
45.9
56.72
53.37
52.63
50
49.75
7.5
7.14
67.5
67.2
M45
3
49
48.9
62.36
57.37
56.63
55
54.7
8.5
8.14
71.5
71.2
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