The globally recognized HLN Hardlock Nut

Leveraging the power of the wedge principle used in ancient Japanese architecture, the HLN Hardlock Nut is the ultimate self-locking nut which completely integrates the nut and the bolt.

HLN Hardlock Nut

Self-locking effect recognized by the world
The HLN Hardlock Nut passes United States NAS (National Aerospace Standard) aviation standards.

Torque and Axial Force control
Control the axial force with proper torque wherever used.

Made of all metal with little few wear surfaces, sustains a powerful self-locking effect.

Easy and efficient
Can be easily installed with just one commercially available tool.

Reduced maintenance and labor add up to a significant savings in overall costs.

Self-locking design

HLN structure

The HLN Hardlock Nut has a structure that prevents looseness through the traditional Japanese principle of the wedge. To effectively utilize the wedge structure, two nuts are used: (1) a convex nut with an eccentrically formed boss, and (2) a perfectly circular concave nut. When these nuts are fastened together, the wedge principle mechanically creates a powerful locking effect transverse to the bolt shaft. This powerful anti-loosening effect achieved with the HLN Hardlock Nut wedge completely fuses the bolt and nut. Once locked with this powerful force, the HLN Hardlock Nut is not susceptible to impulsive forces or shocks.

Improved workability

HLN working efficiency

When a HLN Hardlock Nut concave nut with a rim is tightened, the tightening tool does not attach to the convex nut, greatly increasing the workability compared to conventional nuts.