Hex Castle Nut
Hex castle nuts, also known as castellated nuts or slotted nuts, are a type of fastener that consists of a hexagonal-shaped nut with slots cut into one end. These slots allow for the insertion of a cotter pin, which locks the nut in place and prevents it from loosening. Hex castle nuts are commonly used in applications where vibration or shock may cause traditional nuts to loosen, such as in automotive and aerospace applications.