High Strength Steel Half Thread 12 Point Head Metal Bolts With Flange Nut DIN6923 ASTM A325 A307

This product offering is a complete fastening system, pairing high-strength 12-point flange bolts with matching flange nuts to ensure optimal clamp load and joint integrity. The bolts are manufactured from high-strength steel and are available in either a half-thread configuration for applications requiring a smooth shank under shear loads, or a full-thread option. They are designed to meet or exceed the specifications of ASTM A325 (for high-strength structural bolts) and ASTM A307 (for general-purpose bolts). The included flange nuts, conforming to DIN 6923, feature an integrated serrated or non-serrated flange that provides a consistent bearing surface and a locking action, creating a vibration-resistant assembly ready for critical structural applications.

This bolt and nut assembly is a complete solution for structural steel construction, heavy equipment assembly, and industrial machinery. The ASTM A325 compliant bolts are specifically intended for structural steel connections in buildings and bridges, where high preload and shear strength are mandatory. The half-thread option places the thread run-out outside the shear plane, maximizing the bolt's shear capacity in such connections. The ASTM A307 bolts serve as a reliable general-purpose fastener for less critical structural applications, machinery assembly, and flanged connections. The DIN 6923 flange nuts provide the perfect mating component, ensuring proper load distribution and offering a self-locking characteristic due to the flange's spring action or serrations.

The main advantage is the complete system approach, providing a perfectly matched bolt and nut engineered to work together for maximum clamping efficiency and safety. Conformance to ASTM A325 and A307 provides assurance of material quality, strength, and traceability for critical structural applications. The 12-point flange head allows for high-torque installation with a compact tool profile. The half-thread option is a key feature for structural connections, as it places the weaker threaded portion of the bolt out of the primary shear plane, significantly increasing the joint's overall shear strength. The included DIN 6923 flange nut simplifies assembly by eliminating the need for a separate washer and providing enhanced anti-vibration characteristics.