The NAS1149C0532R is an aerospace-standard flat washer used in aircraft structures to distribute load under bolt or nut heads and protect mating surfaces from damage. It is a direct functional equivalent and commonly approved alternative to AN960C516L, widely used in airframe and maintenance applications.

This washer is designed for 5/16-inch aerospace fasteners, helping ensure even load distribution, reduced stress concentration, and prevention of surface deformation in aluminum and steel assemblies. It is commonly used in structural joints, brackets, equipment mounting, and general aircraft maintenance where reliable fastening is required.

Manufactured to NAS/MIL standards, it is typically made from corrosion-resistant steel (often stainless or passivated alloy steel depending on spec), ensuring durability in vibration-heavy and environmentally exposed aviation conditions. The NAS1149 series is widely used as the modern replacement family for older AN960 configurations in many aircraft systems.

Key features include:

NAS1149C0532R aerospace flat washer
100 pcs maintenance pack
Alternative to AN960C516L
Designed for 5/16-inch aircraft fasteners
Load distribution under bolt/nut heads
Protects structural surfaces from wear
Corrosion-resistant steel construction
Suitable for vibration and cyclic load environments
Common in airframe and maintenance applications
Direct replacement per NAS/MS aircraft standards