HARDLOCK Nut (HLN) – Special Locknut

Liên hệ

HARDLOCK Nut, composed of a convex nut and concave nut, also known as eccentric double nut is an all-metal locknut adaptable to any material.

Danh mục:


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

Download Catalog


Installation Procedure:

B1: Screw the convex nut (tightening nut) onto the target bolt manually.
B2: Use a wrench, torque wrench or other tightening tool to tighten the convex nut to the torque required for the target application.
B3: At this point, the convex nut has exactly the same strength as a general-purpose nut.
B4: Place the concave nut (lock nut) on the convex nut and tighten manually until it no longer turns. Before continuing with a tool, make sure that the gap between the convex nut and concave nut is about one thread pitch. If not, please refrain from using the Hardlock Nut with this bolt. If the gap is narrower than one thread, the nuts will not lock with adequate strength. When reusing a Hardlock Nut, also make sure there is a one thread gap.
B5: Use a torque wrench to tighten the concave nut to the Hardlock recommended torque.
Even if the nuts are tightened correctly, a gap may remain depending on the bolt diameter tolerance. Regardless of whether there is a gap, if tightened correctly as described above, the Hardlock Nut will provide a strong locking effect.
Scroll to Top