BS 2470 - 1973 Hexagon Socket Round Head Screws - Unified Thread


Unit: inch
Screw Thread
d
0# 1# 2# 3# 4# 5# 6# 8# 10# 1/4 5/16 3/8 1/2 5/8
dk max
min
k max
min
s Nominal Size
t min
b min
0.114 0.139 0.164 0.188 0.213 0.238 0.262 0.312 0.361 0.437 0.547 0.656 0.875 1.000
0.104 0.129 0.154 0.176 0.201 0.226 0.250 0.298 0.347 0.419 0.527 0.636 0.851 0.970
0.032 0.039 0.046 0.052 0.059 0.066 0.073 0.087 0.101 0.132 0.166 0.199 0.265 0.331
0.026 0.033 0.038 0.044 0.051 0.058 0.063 0.077 0.091 0.122 0.152 0.185 0.245 0.311
0.035 0.050 0.050 1/16 1/16 5/64 5/64 3/32 1/8 5/32 3/16 7/32 5/16 3/8
0.020 0.028 0.028 0.035 0.035 0.044 0.044 0.052 0.070 0.087 0.105 0.122 0.175 0.210
1/2 1/2 1/2 1/2 1/2 1/2 5/8 3/4 1 1 1 1-1/4 2 2
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