Slotted nuts are specialized fastening components featuring radial slots cut into the top of the nut, designed to enhance security by preventing unintentional loosening. These slots align with holes drilled through the bolt or stud, allowing a split pin (cotter pin) or a wire to be inserted, creating a mechanical lock that withstands vibrations and dynamic loads. Widely utilized in automotive engines, heavy machinery, aerospace assemblies, and other high-stress applications, slotted nuts ensure reliable connections in environments where standard nuts may fail due to constant movement or shock.