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BS 325-4-1947
Black 80° countersunk nibbed bolts and countersunk round bolts-Table 4
Nom
P
dk
k1
s
1/4
20
0.459
0.218
0.062
5/16
18
0.574
0.234
0.078
3/8
16
0.69
0.28
0.094
7/16
14
0.805
0.327
0.109
1/2
12
0.92
0.358
0.125
5/8
11
1.149
0.42
0.156
3/4
10
1.379
0.509
0.188
7/8
9
1.609
0.561
0.219
1
8
1.839
0.625
0.25
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