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


Unit: inch
Screw Thread
d
0# 1# 2# 3# 4# 5# 6# 8# 10#
s Nominal Size
t min
dp max
min
z max
min
0.028 0.035 0.035 0.050 0.050 1/16 1/16 5/64 3/32
0.022 0.028 0.028 0.040 0.040 0.050 0.050 0.062 0.075
0.040 0.049 0.057 0.066 0.075 0.083 0.092 0.109 0.127
0.037 0.045 0.053 0.062 0.070 0.078 0.087 0.103 0.120
0.017 0.021 0.024 0.027 0.030 0.033 0.038 0.043 0.049
0.013 0.017 0.020 0.023 0.026 0.027 0.032 0.037 0.041
Screw Thread
d
1/4 5/16 3/8 7/16 1/2 5/8 3/4 7/8 1
s Nominal Size
t min
dp max
min
z max
min
1/8 5/32 3/16 7/32 1/4 5/16 3/8 1/2 9/16
0.100 0.125 0.150 0.175 0.200 0.250 0.300 0.400 0.450
0.156 0.203 0.250 0.297 0.344 0.469 0.562 0.656 0.750
0.149 0.195 0.241 0.287 0.334 0.456 0.549 0.642 0.734
0.067 0.082 0.099 0.114 0.130 0.164 0.196 0.227 0.260
0.059 0.074 0.089 0.104 0.120 0.148 0.180 0.211 0.240
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