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BS 4174-9-1972
Type T inch cross recessed with type Z countersunk head self tapping cutting screw-Table 9
Nom
P
dk max
dk min
k
t max
t min
M
No.
d max
#4
40|48
0.225
0.195
0.067
0.089
0.073
0.12
1
0.112
#6
32|40
0.279
0.244
0.083
0.107
0.089
0.166
2
0.138
#8
32|36
0.332
0.292
0.1
0.121
0.103
0.181
2
0.164
#10
24|32
0.385
0.34
0.116
0.136
0.118
0.196
2
0.19
1/4
20|28
0.507
0.452
0.153
0.173
0.155
0.275
3
0.25
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