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(Non-preferred) dimensions in parentheses.

Unit:inch

Recessed Truncated Countersunk Head Screws: Long Length

BS 1981 - 1991

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英标BS 1981 - 1991 BS1981 1981BS Recessed Truncated Countersunk Head Screws: Long Length
Screw Thread
d
2# (3#) 4# 5# 6# 8# 10# (12#) 1/4 5/16 3/8 7/16 1/2
dk max
min
k
Penetration depth max
min
M
Socket No.
0.172 0.199 0.225 0.252 0.279 0.332 0.385 0.438 0.507 0.635 0.762 0.812 0.875
0.147 0.171 0.195 0.22 0.244 0.292 0.34 0.389 0.452 0.568 0.685 0.723 0.775
0.051 0.059 0.067 0.075 0.083 0.1 0.116 0.132 0.153 0.191 0.23 0.223 0.223
0.053 0.058 0.079 0.071 0.091 0.107 0.122 0.125 0.151 0.193 0.222 0.238 0.253
0.043 0.048 0.069 0.053 0.073 0.089 0.104 0.107 0.133 0.175 0.204 0.220 0.235
0.094 0.099 0.12 0.146 0.166 0.181 0.196 0.25 0.275 0.357 0.385 0.401 0.416
1 1 1 2 2 2 2 3 3 4 4 4 4
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