MS21042-3 All-Metal Self-Locking Nut | 10-32 Aircraft Lock Nut

MS21042-3 All-Metal Self-Locking Nut

The MS21042-3 is an all-metal self-locking aircraft nut, also known as a Stop Nut or Extended Washer Nut. It is used in aircraft fastening applications where mechanical locking is required without nylon inserts.

The MS21042 family is designed for high-temperature applications, with typical operating temperatures up to 450°F, and features steel construction with cadmium plating. The MS21042 specification has been superseded by NASM21042, so equivalency should be validated according to applicable documentation.