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Slotted Pan Head Machine Screws

BS 1981 - 1991

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英标BS 1981 - 1991 BS1981 1981BS Slotted  Pan Head Machine Screws
Screw Thread
d
0# (1#) 2# (3#) 4# 5# 6# 8# 10#
dk max
min
k max
min
n max
min
t max
min
0.116 0.142 0.167 0.193 0.219 0.245 0.27 0.322 0.373
0.104 0.13 0.155 0.18 0.205 0.231 0.256 0306 0.357
0.039 0.046 0.053 0.06 0.068 0.075 0.082 0.096 0.11
0.031 0.038 0.045 0.051 0.058 0.065 0.072 0.085 0.099
0.023 0.026 0.031 0.035 0.039 0.043 0.048 0.054 0.06
0.016 0.019 0.023 0.027 0.031 0.035 0.039 0.045 0.05
0.022 0.027 0.031 0.036 0.04 0.045 0.05 0.058 0.068
0.014 0.018 0.022 0.026 0.03 0.034 0.037 0.045 0.053
Screw Thread
d
(12#) 1/4 5/16 3/8 7/16 1/2 5/8 3/4
dk max
min
k max
min
n max
min
t max
min
0.425 0.492 0.615 0.74 0.863 0.987 1.125 1.25
0.407 0.473 0.594 0.716 0.838 0.958 1.09 1.209
0.125 0.144 0.178 0.212 0.247 0.281 0.35 0.419
0.112 0.13 0.162 0.195 0.227 0.26 0.325 0.39
0.067 0.075 0.084 0.094 0.094 0.106 0.133 0.149
0.056 0.064 0.072 0.081 0.081 0.091 0.116 0.131
0.077 0.087 0.106 0.124 0.149 0.169 0.211 0.252
0.061 0.07 0.085 0.1 0.119 0.137 0.171 0.205

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