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BS 325-5-1947
Black 80° countersunk square neck bolts for iron and steel work-Table 5
Nom
P
dk
k
3/8
16
0.69
0.313
7/16
14
0.805
0.375
1/2
12
0.92
0.422
5/8
11
1.149
0.515
3/4
10
1.379
0.625
7/8
9
1.609
0.719
1
8
1.839
0.812
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