Heavy hex nuts feature a taller profile than standard hex nuts, providing more thread engagement, greater bearing area, and improved resistance to thread stripping under extreme preload forces in structural connections. JLHY's heavy hex structural nuts are produced to EN 14399-3 (HR nut) and ISO 4032 standards.

Available in Grade 8 and Grade 10 in carbon steel with zinc plating or hot-dip galvanised finish. HDG heavy hex nuts are the standard for outdoor and exposed structural steelwork. The large across-flats dimension requires larger wrench sockets but provides stable engagement in tight structural spaces.

We recommend calibrated torque or turn-of-nut tightening methods for all structural connections. JLHY supplies heavy hex nuts to structural fabricators and contractors worldwide. Contact our structural team for project specifications.