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(Non-preferred) dimensions in parentheses.

Unit:inch

Recessed Truncated Countersunk Head Screws:short Length

BS 1981 - 1991

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英标BS 1981 - 1991 BS1981 1981BS Recessed Truncated Countersunk Head Screws:short 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 max
min
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 0.812 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
0.036 0.042 0.047 0.053 0.059 0.07 0.081 0.092 0.107 0.134 0.161 0.156 0.156
0.028 0.033 0.038 0.043 0.048 0.058 0.068 0.078 0.092 0.116 0.14 0.133 0.13
1 1 1 1 2 2 2 3 3 4 4 4 4
0.087 0.094 0.109 0.12 0.138 0.166 0.181 0.225 0.24 0.309 0.357 0.385 0.401
0.046 0.053 0.068 0.079 0.063 0.091 0.107 0.1 0.115 0.145 0.193 0.222 0.238
0.036 0.043 0.058 0.069 0.045 0.073 0.089 0.082 0.097 0.127 0.175 0.204 0.220
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