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BS 4174-18-1972
Type D inch mushroom head tapping cutting screw-Table 18
Nom
P
dk max
dk min
k max
k min
n max
n min
t
d max
#4
40|48
0.257
0.241
0.069
0.059
0.039
0.031
0.035
0.112
#6
32|40
0.321
0.303
0.086
0.074
0.048
0.039
0.044
0.138
#8
32|36
0.384
0.364
0.102
0.088
0.054
0.045
0.052
0.164
#10
24|32
0.448
0.425
0.118
0.103
0.06
0.05
0.061
0.19
1/4
20|28
0.573
0.546
0.15
0.133
0.075
0.064
0.079
0.25
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