Products Detail

Castle nuts, also known as slotted castle nuts, are specialized precision locking fasteners featured with a unique multi-slotted crown top structure. Different from standard hex nuts, the top of the castle nut is designed with uniform radial slots, which allows the installation of cotter pins to achieve mechanical positive locking. This professional anti-loosening method completely prevents nut rotation and loosening caused by severe vibration, alternating impact loads and dynamic torque changes, providing extremely high connection safety and reliability. It is a mandatory locking fastener for key safety-related mechanical connection positions that require anti-loosening and anti-disengagement protection.
Adopting integral forging and precision CNC machining technology, our castle nuts feature smooth and flat surface, precise slot symmetry and accurate thread tolerance. All thread surfaces are burr-free with excellent meshing performance and interchangeability. Manufactured in strict accordance with industrial standards, corresponding grades are processed with standardized heat treatment as required, delivering stable hardness, reliable tensile strength and excellent structural toughness. The standardized slotted structure ensures perfect matching with standard cotter pins, enabling quick and convenient on-site installation and locking positioning. Widely used in safety-critical equipment connections, mechanical transmission systems, heavy-duty engineering equipment and structural fastening scenarios, castle nuts provide permanent anti-loosening and fail-safe fastening solutions.

Manufacturer Advantages:
We are a professional manufacturer dedicated to high-standard castle nut production, with mature processing technology for crown slotted structure forming and precision threading. Our full-range product lineup covers multiple strength classes including Class 2, 5, 8 and 2H, made of high-quality carbon steel and alloy steel materials, with a complete imperial size range of 1”–2”, fully meeting heavy-duty industrial engineering fastening requirements.
We implement strict full-process quality control covering raw material selection, integral forging forming, precision thread tapping, standardized heat treatment and finished product dimension inspection. We precisely control core indicators such as slot depth, slot symmetry, thread accuracy and mechanical properties to ensure consistent locking performance and stable batch quality. Supporting large-scale bulk supply and customized processing, our castle nuts feature high assembly accuracy, reliable safety performance and cost-effective pricing. With stable product quality and thoughtful full-cycle service, our fasteners have won wide recognition from global customers, and we are committed to providing long-term, stable and win-win cooperative services for clients worldwide.

Surface Finishing:
Black Oxide, Zinc Plating, Hot-Dip Galvanizing, Dacromet, Delta, Geomet, Magni, Teflon, Blue Wax, Molybdenum Disulfide (MoS2) Coating