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ASME B18.5 TABLE 10 Standard Dimensions for Round head bolts, inch series

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T-Head Bolts

Dimensional Drawing and Technical Diagrams

1465_CC3Hyg_ASME-B18.5-table-10.jpg

Key Dimensions and Technical Parameters

Dimensions in inches - source ASME B18.5 Table 10

Publication date: 2008
Nominal size or basic bolt Diameter E A B H K
Max Min Max Min Max Min Max Min Basic

1/4 (0.2500)

 0.260 0.237 0.500 0.488 0.280 0.245 0.204 0.172 0.438
5/16 (0.3125) 0.324 0.298 0.625 0.609 0.342 0.307 0.267 0.233 0.500
3/8 (0.3750) 0.388 0.360 0.750 0.731 0.405 0.368 0.331 0.295 0.625
7/16 (0.4375) 0.452 0.421 0.875 0.853 0.468 0.431 0.394 0.356 0.875
1/2 (0.5000) 0.515 0.483 1.000 0.975 0.530 0.492 0.458 0.418 0.875
5/8 (0.6250) 0.642 0.605 1.250 1.218 0.675 0.616 0.585 0.541 1.062
3/4(0.7500) 0.768 0.729 1.500 1.462 0.800 0.741 0.649 0.601 1.250
7/8 (0.8750) 0.895 0.852 1.750 1.706 0.938 0.865 0.766 0.724 1.375

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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