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BS 4174-20-1972
Type T inch cross recessed with type Z recess dimensions for flange head tapping cutting screw-Table 20
Nom
P
dc max
dc min
k max
k min
h max
h min
t max
t min
M
No.
d max
#4
40|48
0.257
0.241
0.063
0.053
0.025
0.019
0.073
0.057
0.104
1
0.112
#6
32|40
0.321
0.303
0.074
0.062
0.028
0.022
0.084
0.066
0.146
2
0.138
#8
32|36
0.384
0.364
0.093
0.079
0.031
0.025
0.101
0.083
0.162
2
0.164
#10
24|32
0.448
0.425
0.114
0.099
0.036
0.028
0.115
0.097
0.176
2
0.19
1/4
20|28
0.573
0.546
0.145
0.128
0.046
0.038
0.159
0.141
0.265
3
0.25
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