BS 1981 - 1991 Cross Recessed Pan Head Machine Screws


Unit: inch
英标BS 1981 - 1991 BS1981 1981BS Cross Recessed Pan Head Machine Screws
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
Penetration depth max
min
m Nominal Size
Socket No.
0.167 0.193 0.219 0.245 0.27 0.322 0.373 0.425 0.492 0.615 0.74 0.863 0.987
0.155 0.18 0.205 0.231 0.256 0306 0.357 0.407 0.473 0.594 0.716 0.838 0.958
0.053 0.06 0.068 0.075 0.082 0.096 0.11 0.125 0.144 0.178 0.212 0.247 0.281
0.045 0.051 0.058 0.065 0.072 0.085 0.099 0.112 0.13 0.162 0.195 0.227 0.26
0.053 0.062 0.072 0.068 0.076 0.092 0.108 0.117 0.137 0.164 0.201 0.224 0.246
0.043 0.052 0.062 0.050 0.058 0.074 0.09 0.099 0.119 0.146 0.183 0.206 0.228
0.096 0.104 0.114 0.146 0.154 0.169 0.185 0.246 0.265 0.333 0.369 0.392 0.412
1 1 1 2 2 2 2 3 3 4 4 4 4
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