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ASME B18.5 TABLE 7 Standard Dimensions for Round head bolts, inch series

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Countersunk Bolts and Slotted Countersunk Bolts

Dimensional Drawing and Technical Diagrams

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Key Dimensions and Technical Parameters

Dimensions in inches - source ASME B18.5 Table 7

Publication date: 2008
Nominal size or basic bolt Diameter E A H J T
Max Min Max Min Absolute Min Edge Rounded or Flat Max Min Max Min Max Min
1/4 (0.2500) 0.260 0.237 0.493 0.477 0.4456 0.150 0.131 0.075 0.064 0.068 0.045
5/16 (0.3125) 0.324 0.298 0.618 0.598 0.558 0.189 0.164 0.054 0.072 0.086 0.057
3/8 (0.3750) 0.388 0.360 0.740 0.715 0.68 0.225 0.196 0.094 0.081 0.103 0.068
7/16 (0.4375) 0.452 0.421 0.803 0.778 0.726 0.226 0.196 0.094 0.081 0.130 0.068
1/2 (0.5000) 0.515 0.483 0.935 0.905 0.45 0.269 0.223 0.106 0.091 0.103 0.068
5/8 (0.6250) 0.642 0.605 1.169 1.132 1.066 0.336 0.292 0.133 0.116 0.137 0.091
3/4 (0.7500) 0.768 0.729 1.402 1.357 1.285 0.403 0.349 0.149 0.131 0.171 0.115
7/8 (0.8750) 0.895 0.852 1.637 1.584 1.511 0.470 0.408 0.167 0.147 0.206 0.138
1 (1.000)

1.022

 0.976 1.869 1.810 1.735 0.537 0.466 0.188 0.166 0.240 0.162
1-1/8 (1.1250) 1.149 1.098 2.104 2.037 1.962 0.604 0.525 0.196 0.178 0.257 0.173
1-1/4 (1.2500) 1.277 1.223 2.337 2.262 2.187 0.671 0.582 0.211 0.193 0.291 0.197
1-3/8 (1.3750) 1.404 1.345 2.571 2.489 2.414 0.738 0.641 0.226 0.208 0.326 0.220
1-1/2 (1.5000) 1.531 1.470 2.804 2.715 2.640 0.805 0.698 0.258 0.240 0.360 0.244

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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