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BS 1768-1963
Hexagon thick nuts-washer faced
Nom
P
k max
k min
s max
s min
1/4
20|28|32
0.286
0.276
0.4375
0.4305
5/16
18|24|32
0.333
0.323
0.5
0.493
3/8
16|24|32
0.411
0.401
0.5625
0.5545
7/16
14|20|28
0.458
0.448
0.6875
0.6795
1/2
13|20|28
0.567
0.557
0.75
0.742
9/16
12|18|24
0.614
0.604
0.875
0.867
5/8
11|18|24
0.724
0.714
0.9375
0.9295
3/4
10|16|20
0.822
0.802
1.125
1.115
7/8
9|14|20
0.916
0.896
1.3125
1.3005
1
8|12|20
1.015
0.985
1.5
1.448
1-1/8
7|12|18
1.176
1.136
1.6875
1.6575
1-1/4
7|12|18
1.275
1.225
1.875
1.83
1-3/8
6|12|18
1.4
1.35
2.0625
2.0175
1-1/2
6|12|18
1.53
1.47
2.25
2.205
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