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BS 2470 3 Standard Dimensions for Hexagon socket countersunk head screws

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This norm has been cancelled

Hexagon socket countersunk head screws with ISO inch (Unified) threads 

Dimensional Drawing and Technical Diagrams

1793_LuCnig_bs-2470-table-3.jpg

Key Dimensions and Technical Parameters

Dimensions in inches - BS 2470 Table 3 - Socket Flat Countersunk Head Cap Screws
d thread size Nr. of threads x inch d1 min b basic thread length dk max theo.Sharp k max t min S nom M nom
inches mm UNC UNF
0 (0.06) 1.52 - 80 0.568 0.5 0.138 0.044 0.025 0.035 0.048
1 (0.073) 1.85 64 72 0.07 0.62 0.168 0.054 0.031 0.05 0.06
2 (0.086) 2.18 56 64 0.082 0.62 0.197 0.064 0.038 0.05 0.06
3 0.099) 2.51 48 56 0.095 0.62 0.226 0.073 0.044 0.062 0.072
4 (0.112) 2.84 40 48 0.108 0.75 0.255 0.083 0.055 0.062 0.072
5 (0.125) 3.18 40 44 0.12 0.75 0.281 0.90 0.061 0.078 0.096
6 (0.138) 3.51 32 40 0.133 0.75 0.307 0.097 0.066 0.078 0.096
8 (0.164) 4.17 32 36 0.159 0.875 0.359 0.112 0.076 0.094 0.111
10 (0.19) 4.83 24 32 0.184 0.875 0.411 0.127 0.087 0.125 0.145
1/4 6.35 20 28 0.244 1 0.531 0.161 0.111 0.156 0.183
5/16 7.94 18 24 0.305 1.125 0.656 0.198 0.135 0.188 0.216
3/8 9.53 16 24 0.368 1.25 0.781 0.234 0.159 0.219 0.251
7/16 11.11 14 20 0.429 1.375 0.844 0.234 0.159 0.25 0.291
1/2 12.70 13 20 0.492 1.5 0.938 0.251 0.172 0.312 0.372
5/8 15.88 11 18 0.616 1.75 1.188 0.324 0.220 0.375 0.454
3/4 19.05 10 16 0.741 2 1.438 0.396 0.220 0.5 0.454
7/8 22.23 9 14 0.865 2.25 1.688 0.468 0.248 0.562 -
1 25.40 8 12 0.989 2.5 1.938 0.540 0.297 0.625 -
1-1/8 28.58 7 12 1.108 2.81 2.188 0.611 0.325 0.75 -
1-1/4 31.75 7 12 1.233 3.12 2.438 0.683 0.358 0.875 -
1-3/8 34.93 6 12 1.357 3.44 2.688 0.755 0.402 0.875 -
1-1/2 38.10 6 12 1.482 3.75 2.938 0.827 0.435 1 -

Reproduced by permission of DIN Deutsches Institut für Normung e. V. The definitive version for the implementation of this standard is the edition bearing the most recent date of issue, obtainable from Beuth Verlag GmbH, Burggrafenstraße 6, 10787 Berlin, Germany.
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