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BS 450-3-2017
Cross recessed 90° oval countersunk flat head screws-Table 3
Nom
P
dk max
dk min
k max
f
t max
t min
M
No.
1/8
40
0.219
0.201
0.056
0.026
0.092
0.076
0.123
1
3/16
24|32
0.328
0.307
0.084
0.04
0.137
0.119
0.197
2
1/4
20|26
0.438
0.412
0.113
0.061
0.169
0.151
0.275
3
5/16
18|22
0.547
0.518
0.141
0.068
0.199
0.181
0.341
4
3/8
16|20
0.656
0.624
0.169
0.08
0.254
0.236
0.394
4
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