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


Unit: inch
Screw Thread
d
0# 1# 2# 3# 4# 5# 6# 8# 10#
ds max
min
dk max
min
k max
min
s Nominal Size
t min
b min
0.0600 0.0730 0.0860 0.0990 0.1120 0.1250 0.1380 0.1640 0.1900
0.0568 0.0695 0.0822 0.0949 0.1075 0.1202 0.1329 0.1585 0.1840
0.096 0.118 0.140 0.161 0.183 0.205 0.226 0.270 0.312
0.091 0.112 0.134 0.154 0.176 0.198 0.218 0.262 0.303
0.060 0.073 0.086 0.099 0.112 0.125 0.138 0.164 0.190
0.057 0.070 0.083 0.095 0.108 0.121 0.134 0.159 0.185
0.050 0.050 1/16 5/64 5/64 3/32 3/32 1/8 5/32
0.025 0.031 0.038 0.044 0.051 0.057 0.064 0.077 0.090
0.500 0.625 0.625 0.625 0.750 0.750 0.750 0.875 0.875
Screw Thread
d
1/4 5/16 3/8 7/16 1/2 5/8 3/4 7/8 1
ds max
min
dk max
min
k max
min
s Nominal Size
t min
b min
0.2500 0.3125 0.3750 0.4375 0.5000 0.6250 0.7500 0.8750 1.0000
0.2435 0.3053 0.3678 0.4294 0.4919 0.6163 0.7406 0.8647 0.9886
0.375 0.437 0.562 0.625 0.750 0.875 1.000 1.125 1.312
0.365 0.425 0.550 0.611 0.735 0.858 0.982 1.105 1.291
0.250 0.312 0.375 0.437 0.500 0.625 0.750 0.875 1.000
0.244 0.306 0.368 0.430 0.492 0.616 0.740 0.864 0.988
3/16 7/32 5/16 5/16 3/8 1/2 9/16 9/16 5/8
0.120 0.151 0.182 0.213 0.245 0.307 0.370 0.432 0.495
1.000 1.125 1.250 1.375 1.500 1.750 2.000 2.250 2.500
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