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BS 325-7-1947
Black hexagon nuts
Nom
P
s max
s min
k max
k min
1/4
20|26
0.445
0.435
0.22
0.2
5/16
18|22
0.525
0.515
0.27
0.25
3/8
16|20
0.6
0.585
0.33
0.31
7/16
14|18
0.71
0.695
0.39
0.37
1/2
12|16
0.82
0.8
0.46
0.43
5/8
11|14
1.01
0.985
0.6
0.56
3/4
10|12
1.2
1.175
0.72
0.68
7/8
9|11
1.3
1.27
0.81
0.75
1
8|10
1.48
1.45
0.93
0.87
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