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BS 2470 4 Standard Dimensions for Hexagon socket button head screws without flange or with flange

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

Dimensional Drawing and Technical Diagrams

1780_zgwJe0_BS-2470-4.jpg

Key Dimensions and Technical Parameters

Dimensions in inches - source BS 2470 Table 4

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

Publication date: 07/1973
d basic thread size Nr of threads x inch dk max dk min

k max

 k min b t min s
inches mm UNC
0 (0.06) 1.52 - 0.114 0.104 0.032 0.026 0.5 0.020 0.035
1 (0.073) 1.85 64 0.139 0.129 0.039 0.033 0.5 0.028 0.05
2 (0.086) 2.18 56 0.164 0.154 0.046 0.046 0.5 0.028 0.05
3 (0.099) 2.51 48 0.188 0.176 0.052 0.052 0.5 0.035 0.062
4 (0.1129 2.84 40 0.213 0.201 0.059 0.059 0.5 0.035 0.062
5 (0.125) 3.18 40 0.238 0.226 0.066 0.066 0.5 0.044 0.078
6 (0.138) 3.51 32 0.262 0.250 0.073 0.073 0.63 0.044 0.078
8 (0.164) 4.17 32 0.312 0.298 0.087 0.087 0.750 0.052 0.094
10 (0.19) 4.83 24 0.361 0.347 0.101 0.101 1 0.070 0.125
1/4 6.35 20 0.437 0.419 0.132 0.132 1 0.087 0.156
5/16 7.94 18 0.547 0.527 0.166 0.166 1 0.105 0.188
3/8 9.53 16 0.656 0.636 0.199 0.199 1.25 0.122 0.219
1/2 12.70 13 0.875 0.851 0.265 0.265 2 0.175 0.312
5/8 15.88 11 1 0.970 0.331 0.331 2 0.210 0.375

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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