BS 4174 - 1972 80°Slotted Raised Countersunk Head Tapping Screws [Table 12]


Unit: inch
Size
2# 4# 6# 8# 10# 12# 14# 16#
dk (mm) max
min
k (mm) ref.
n (mm) max
min
t (mm) Nominal Size
f (mm) Nominal Size
dk (in.) max
min
k (in.) ref.
n (in.) max
min
t (in.) Nominal Size
f (in.) Nominal Size
4.37 5.71 7.09 8.43 9.78 11.13 12.88 16.13
3.73 4.95 6.2 7.42 8.64 9.88 11.48 14.43
1.3 1.7 2.11 2.54 2.95 3.35 3.89 4.85
0.79 0.99 1.22 1.37 1.52 1.7 1.9 2.13
0.58 0.79 0.99 1.14 1.27 1.42 1.63 1.83
1.04 1.37 1.7 2.03 2.39 2.72 3.15 3.96
0.64 0.84 1.02 1.22 1.4 1.6 1.83 2.29
0.172 0.225 0.279 0.332 0.385 0.438 0.507 0.635
0.147 0.195 0.244 0.292 0.340 0.389 0.452 0.568
0.051 0.067 0.083 0.100 0.116 0.132 0.153 0.191
0.031 0.039 0.048 0.054 0.060 0.067 0.075 0.084
0.023 0.031 0.039 0.045 0.050 0.056 0.064 0.072
0.041 0.054 0.067 0.080 0.094 0.107 0.124 0.156
0.025 0.033 0.040 0.048 0.055 0.063 0.072 0.090
①,Edge of head may be rounded or flat.
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