Hard Lock Features and Benefits

  • Unparalleled rotation and looseness prevention rate
  • Screw position can be fixed at the middle
  • Fully reusable
  • Bolt axial force (fastening power maintained for extended periods)
  • Easy attachment requires only a wrench
  • Drastically reduces labor costs associated with retightening
Hard Lock Nuts Secure Fastening Solutions


The most secure fastening solution for extreme vibration environments.

Hard Lock Nuts resist loosening from vibration longer than any other fastener or locking nut on the market. New to the U.S. market, and a leading choice for engineers in Japan, the United Kingdom and Europe, the Hard Lock Nut uses a unique wedge principle to create an unprecedented and powerful self-locking force. Hard Lock Nuts have been proven successful for more than a decade, and in many industries, including railways, civil engineering, telephone, radar and power masts, towers and pylons, wind turbines towers and more. The extremely secure connection enhances safety and reduces maintenance and inspection costs.

NAS Testing - Hard Lock Nuts PDF Print E-mail


  • Vibration Frequency: 1,780 c.p.m.
  • Vibration Stroke: 11mm
  • Impact Stroke: 19mm
  • Structure Acceleration : 19.5G
Hard Lock Wedge Mechanism E-mail
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