Heavy hex bolts are the fastener of choice for structural steel connections in bridges, buildings, and industrial facilities. JLHY's heavy hex structural bolts feature a taller hexagonal head providing larger bearing area and more material at critical stress points than standard hex bolts, making them more resistant to bending and shear forces.

Produced to EN 14399 / ISO 4014 standards with full compliance including material chemistry, heat treatment, dimensional tolerances, and mechanical properties. The larger head distributes clamping pressure over a greater area — particularly beneficial for thin flange plates or slotted holes.

Available in Grade 8.8, 10.9, and 12.9, as well as ASTM A325 equivalents. All structural heavy hex bolts from JLHY carry traceability documentation including mill test certificates and batch test reports. Contact our structural engineering support team for project-specific specifications.