Castle nuts are a type of fastener commonly used in various industries, including automotive, aerospace, and machinery. As their name suggests, castle nuts feature a unique design resembling the turrets of a castle, which provides them with distinctive advantages and applications. These nuts are widely recognized for their excellent locking capabilities and secure fastening properties.

Castle nuts are typically made of durable materials such as stainless steel, carbon steel, or alloy steel, ensuring high strength and resistance to corrosion. They are designed with a series of radial slots on one end, creating a pattern similar to the crenellations found on a medieval castle. These slots are essential for accommodating a cotter pin or a locking mechanism, enabling the nut to secure tightly in place.