NAS Flat Washers (National Aerospace Standard)
What are NAS flat washers? NAS flat washers are precision washers manufactured to National Aerospace Standards, the technical standards maintained by the Aerospace Industries Association for aircraft, missiles, and aerospace assemblies. Dimensionally similar to commercial washers but held to tighter flatness and finish tolerances, they meet the exacting requirements of aerospace and defense work.
What is a NAS washer?
National Aerospace Standard washers, such as the widely specified NAS620 series, are called out by part number on aircraft and defense drawings because they guarantee tight, repeatable dimensions, flatness, finish, and material, which matters in mission-critical assemblies. They are dimensionally close to commercial SAE washers but manufactured to closer tolerances, so a commercial substitution requires formal engineering approval. Made from 18-8 stainless, these washers add corrosion and oxidation resistance for aircraft and outdoor exposure. Where a drawing calls for a NAS part number, use the certified NAS washer rather than a commercial equivalent.
Why choose NAS flat washers
- Aerospace standard: manufactured to National Aerospace Standards.
- Tight tolerances: closer flatness and finish than commercial washers.
- Corrosion resistant: 18-8 stainless resists oxidation and rust.
- Traceable: called out by part number for spec conformance.
Common applications for NAS flat washers
- Aircraft and airframe assemblies
- Missiles and aerospace hardware
- Defense and government programs
- Any drawing specifying a NAS part number
For other military and aerospace standards, see MS military standard flat washers and AN aeronautical flat washers, and browse every option on the main flat washers category.
NAS Flat Washers FAQ
What does NAS stand for?
National Aerospace Standard, a family of technical standards maintained