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K-Nut Top Lock Nut COARSE

Hardened Steel, Zinc Nickel

Extra Small Wrench Nut

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Hardened Steel / K-NUT Extra Small Wrench Size

This thin walled, reduced height self locking flange nut features an extremely reduced wrench size for installation in space restricted areas. Originally designed for the aerospace industry, the super light weight design of this nut makes it popular in motorsport applications.

K-Nuts have an elliptical deformation locking design, meant to distort the threads of the mating bolt or screw. The friction between the threads of the nut and the bolt increases the amount of force needed to tighten (and securely lock) the assembly into place.

The smooth bottom flange acts as a built-in washer to evenly distribute force over a larger area against the fastening surface.

Also known as all metal lock nut, many motorsport and automotive applications. Commonly used in Aerospace applications to standards MS21042 / NAS1291

25CrMo4 Alloy Structural Steel, Lightweight! 
(Hardened strength, 1100 Mpa, comparable to Metric Class 10.9) 
Rockwell HRC 44max 

Finish *Replaces previous finish which contained Cadmium and Hexavalent Chromium
Zinc-Nickel Plating, Treated with Trivalent Chromium
MoS2 Coating (dry film coating) 
Low Friction *helps reduce wear and coefficient of friction 
Cadmium Free / Compliant with EU Regulations

Salt Spray: 500 hrs. 
Temp Max: 455F