The NAS1149D0416J Washer is a lightweight aerospace flat washer manufactured to National Aerospace Standard (NAS) specifications for aircraft fastening and structural assembly applications. Designed for use with compatible bolts, screws, and nuts, this washer helps distribute clamping loads evenly, reduce surface wear, and improve fastening reliability in vibration-sensitive environments.

The “D” designation typically indicates aluminum alloy construction, while the “J” suffix identifies a thinner-profile washer configuration commonly used in applications where reduced weight and limited assembly clearance are important. Supplied in a pack of 100 pieces, these washers are suitable for aircraft maintenance, repair, and production operations.

Its primary features include:
Manufactured to NAS1149 aerospace hardware standards
Lightweight aluminum alloy construction
Thin-profile (“J”) configuration for low-clearance applications
Helps distribute fastening loads and reduce surface stress
Suitable for aircraft structural and mechanical assemblies
Corrosion-resistant material for aviation environments
Packaged in a convenient 100-piece maintenance pack

Washers like the NAS1149D0416J are widely used throughout aerospace systems because they support lightweight aircraft construction while maintaining reliable fastening performance and protecting assembly surfaces from vibration-related wear.