Dimensions of Heavy Hex Nuts ASME B18.2.2 used with Stud Bolts according to ASME B16.5


  • All dimensions are given in inches unless otherwise indicated.
  • Heavy hex nuts are slightly larger and thicker than standard (finished) hex nuts. There are numerous grades and the heavy pattern is typically used for large diameter and high strength bolts.

Important: the Across Flat sizes in Millimeters shown in the table should be used as a guide only.
Individual sizes should be checked before specifying any equipment.