It easily clears the US National Aerospace Std. vibration impact test.

Easy locking, using a single hexagon wrench.

Keeps a locking power even in unusually harsh environment.

Repeated removal and installation does not affect anti-loosing effect.

Lifetime cost is lower because of the reduced maintenance.

The Hard Lock Setscrew is designed on a basis of the wedge-effect.

Its intrinsic locking energy is not affected by the external impact and vibration, keeping a permanent stability.

HLS has been tested and cleared American NAS 3350, 3354(aerospace requisites). In comparison with the standard Holo nut, the difference is clearly seen. The reason for this is HLS is designed on a basis of wedge effect which is made up of a concave fixing screw and a convex lock screw which are eccentrically fitted together. This wedge effect is now patented and actual Toyota test results show the uniqueness and stability of HLS.

HLS(HARD LOCK SETSCREW) Setting style

It clears the NAS3350 spec'n with a large margin.

*The vibration impact testing machine is manufactured in conformity to the NAS3350, 3354.