NUT – S4215-4 (Replaces NAS446-4-3)

Self-locking aircraft nut designed for secure fastening in aerospace structural and mechanical assemblies. It incorporates a locking feature that resists loosening under vibration and cyclic loading, making it suitable for critical airframe and system installations. The nut is manufactured to aerospace standards as a direct replacement for NAS446-4-3, ensuring compatibility in existing certified assemblies.

Application:
Aircraft structural assemblies, airframe attachment points, control system linkages, engine accessory installations, and general aviation fastening where vibration-resistant locking nuts are required

Function:
Provides a threaded locking connection that maintains clamp load under vibration and dynamic loads, preventing self-loosening of bolted joints in aircraft structures and systems