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GB/T 12-1988
Cup head square neck bolts
Nom
P
dk max
dk min
k1 max
k1 min
k max
k min
s max
s min
r min
ds max
ds min
M6
1
13.1
11.3
4.4
3.6
4.08
3.2
6.3
5.84
0.5
6
5.35
M8
1.25
17.1
15.3
5.4
4.6
5.28
4.4
8.36
7.8
0.5
8
7.19
M10
1.5
21.3
19.16
6.4
5.6
6.48
5.6
10.36
9.8
0.5
10
9.03
M12
1.75
25.3
23.16
8.45
7.55
8.9
7.55
12.43
11.76
0.8
12
10.86
M14
2
29.3
27.16
9.45
8.55
9.9
8.55
14.43
13.76
0.8
14
12.70
M16
2
33.6
31
10.45
9.55
10.9
9.55
16.43
15.76
1
16
14.70
M20
2.5
41.6
39
12.55
11.45
13.1
11.45
20.52
19.22
1
20
18.38
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