EN14399-3 Hexagonal High-Strength Structural Nuts

First and foremost, the nut cooperates with EN14399 series high-strength bolts to generate and lock preset clamping preload. During installation, torque tightening or hydraulic tensioning stretches the bolt elastically, while this nut bears the axial reaction force to compress connected steel plates tightly. Reliable preload creates sufficient frictional resistance between contact surfaces, which transfers external shear loads via interfacial friction rather than bolt shank bearing contact. This fundamentally avoids bolt shear failure and drastically improves connection rigidity under dynamic loads like wind vibration, vehicle fatigue loading and seismic shaking.

Second, the nut's standardized mechanical property grade (typically 10HR as marked on the nuts in the images) guarantees consistent yield strength, hardness and anti-plastic deformation capacity. It resists yielding, thread creep and loosening under long-term sustained load, temperature fluctuation and minor structural deformation. Precision-machined internal threads deliver uniform load distribution along thread engagement, preventing localized thread stripping or stress concentration that triggers premature fracture.

Third, it secures long-term connection stability without frequent re-tightening. With qualified surface anti-corrosion treatment, it avoids rust-induced thread jamming and strength degradation. As a vital locking component of structural bolt assemblies, it maintains stable clamping pressure permanently, restrains joint separation under tension loads, ensures structural geometric stability, and fulfills the safety and durability requirements of European steel structure design codes. In summary, it acts as a critical force-locking element to sustain friction-type connection integrity and overall structural safety.

Established in 2005, our company has evolved over two decades of continuous development into a leading regional enterprise in the fastener industry with fully automated end-to-end production. With an annual output value exceeding RMB 130 million, our product range covers diverse market segments from mid-range to high-end and is distributed worldwide