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GB/T 31.2-2025
Hexagon bolts with split pin hole on shank-reduced shank
Nom
P
d1 max
d1 min
L1
da max
e min
k max
k min
r min
s max
s min
M6
1
1.85
1.6
L-3.3
6.8
10.89
4.24
3.76
0.25
10
9.64
M7
1
1.85
1.6
L-3.3
7.8
11.94
5.04
4.56
0.25
11
10.57
M8
1.25
2.25
2
L-3.9
9.2
14.2
5.54
5.06
0.4
13
12.57
M10
1.5
2.75
2.5
L-4.9
11.2
17.59
6.69
6.11
0.4
16
15.57
M12
1.75
3.5
3.2
L-5.9
13.7
19.85
7.79
7.21
0.6
18
17.57
M14
2
3.5
3.2
L-6.5
15.7
22.78
9.09
8.51
0.6
21
20.16
M16
2
4.3
4
L-7
17.7
26.17
10.29
9.71
0.6
24
23.16
M18
2.5
4.3
4
L-7.7
20.2
29.56
11.85
11.15
0.6
27
26.16
M20
2.5
4.3
4
L-7.7
22.4
32.95
12.85
12.15
0.8
30
29.16
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