JLHY's hex head screws with full thread are designed for structural connections where maximum load-bearing capacity and reliable clamping force are essential. The full thread design ensures the entire shank engages with the receiving nut or threaded hole, providing exceptional pull-out resistance and consistent clamp load — critical properties in structural steel connections, scaffolding, and heavy machinery assembly.

The hex head allows high-torque tightening with standard wrenches or sockets, and the large bearing surface distributes load across a wide area, protecting the connected material. These screws are produced to DIN 933 / ISO 4017 standards in metric threads from M6 to M36, ensuring compatibility with standard structural nuts and washers worldwide.

Standard material is Grade 8.8 carbon steel with zinc plating, with Grade 10.9 and 12.9 variants and hot-dip galvanised (HDG) options available for outdoor and more demanding structural applications. Every batch undergoes tensile testing, proof load testing, and hardness verification. We provide full traceability documentation including mill test certificates for engineering projects requiring certified fastener records.

JLHY supplies structural hex screws to engineering contractors, steel fabricators, and construction companies worldwide. Contact our structural engineering support team for project-specific specifications and pricing.