Castle nuts feature a notched "castle" profile at the top that, when used with a cotter pin through the radial slots and bolt, creates a mechanical lock that prevents rotation even under extreme vibration. JLHY's slotted castle nuts are manufactured for automotive and mechanical applications that demand absolute positional security.

The classic application is the wheel hub bearing nut, where the castle nut must hold bearing preload precisely under enormous dynamic loads from cornering, braking, and road vibration. Other applications include steering assemblies, suspension components, and heavy equipment rotating shafts.

Produced from heat-treated carbon steel to DIN 935 / ISO 4161 with precise slot width and radial alignment. Available in zinc-plated carbon steel and stainless steel for marine automotive applications. Automotive-grade castle nuts are manufactured to IATF 16949 quality with PPAP documentation packages for OEM customers.