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(Non-preferred) dimensions in parentheses.

Unit:inch

Recessed raised Countersunk Head Machine Screws

BS 1981 - 1991

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英标BS 1981 - 1991 BS1981 1981BS Recessed raised Countersunk Head Machine Screws
Screw Thread
d
2# (3#) 4# 5# 6# 8# 10# (12#) 1/4 5/16 3/8
dk max
min
k
Socket No.
M
Penetration depth max
min
0.172 0.199 0.225 0.252 0.279 0.332 0.385 0.438 0.507 0.635 0.762
0.147 0.171 0.195 0.22 0.244 0.292 0.34 0.389 0.452 0.568 0.685
0.051 0.059 0.067 0.075 0.083 0.1 0.116 0.132 0.153 0.191 0.23
1 1 1 2 2 2 2 3 3 4 4
0.095 0.109 0.123 0.15 0.169 0.183 0.2 0.261 0.28 0.373 0.398
0.053 0.067 0.082 0.073 0.092 0.107 0.124 0.133 0.152 0.205 0.231
0.043 0.057 0.072 0.055 0.074 0.089 0.106 0.115 0.134 0.187 0.213
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