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


Unit: inch
Screw Thread
d
0# 1# 2# 3# 4# 5# 6# 8#
ds max
min
dk max
min
s Nominal Size
t min
b min
k Ref.
0.0600 0.0730 0.0860 0.0990 0.1120 0.1250 0.1380 0.1640
0.0568 0.0695 0.0822 0.0949 0.1075 0.1202 0.1329 0.1585
0.138 0.168 0.197 0.226 0.255 0.281 0.307 0.359
0.117 0.143 0.168 0.193 0.218 0.240 0.263 0.311
0.035 0.050 0.050 1/16 1/16 5/64 5/64 3/32
0.025 0.031 0.038 0.044 0.055 0.061 0.066 0.076
0.500 0.625 0.625 0.625 0.750 0.750 0.750 0.875
0.046 0.057 0.066 0.075 0.085 0.093 0.1 0.116
Screw Thread
d
10# 1/4 5/16 3/8 7/16 1/2 5/8 3/4
ds max
min
dk max
min
s Nominal Size
t min
b min
k Ref.
0.1900 0.2500 0.3125 0.3750 0.4375 0.5000 0.6250 0.7500
0.1840 0.2435 0.3053 0.3678 0.4294 0.4919 0.6163 0.7406
0.411 0.531 0.656 0.781 0.844 0.937 1.188 1.438
0.359 0.476 0.589 0.704 0.755 0.857 1.065 1.293
1/8 5/32 3/16 7/32 1/4 5/16 3/8 1/2
0.087 0.111 0.135 0.159 0.159 0.172 0.220 0.220
0.875 1.000 1.125 1.250 1.375 1.500 1.750 2.000
0.131 0.167 0.205 0.241 0.242 0.260 0.335 0.41
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