AN960 — Flat Washer (Superseded by NAS1149)
AN960 is the legacy Air Force-Navy Aeronautical Standard for flat washers, last revised (Revision 21) on August 6, 1992. It has been officially superseded by NAS1149, though AN960 part numbers remain widely used and stocked for maintenance, repair, and legacy-drawing support.
At a Glance
Overview
AN960 is one of the original "AN" (Army-Navy) hardware standards developed jointly by the U.S. Army and Navy before the aerospace fastener catalog was consolidated under the Aerospace Industries Association's National Aerospace Standard (NAS) system. Its final revision, Revision 21, was issued August 6, 1992, and the standard has since been superseded by NAS1149.
Despite its superseded status, AN960 part numbers remain in active use across legacy aircraft maintenance, repair, and overhaul (MRO) work, since many older type-certificated aircraft drawings still call out AN960 washers by name. Washers are produced in carbon steel with cadmium plating (material per MIL-S-7952 or QQ-S-698, finish per QQ-P-416) and in corrosion resistant steel with a passivated finish.
- Dash number sets nominal size; an "L" suffix denotes a large outside diameter variant.
- A "C" prefix before the dash number denotes a corrosion-resistant-steel washer.
- For any new design, engineers should specify NAS1149 rather than AN960.
Part Number Reference
AN960 uses a material prefix, dash size number, and optional large-OD suffix.
AN Washer Family
| Standard | Description | Superseded By |
|---|---|---|
| AN960 | Washer, Flat (Rev. 21, 6 Aug 1992) | NAS1149 |
| AN961 | Washer, Flat, Electrical (Rev. 2, 10 Aug 1967) | NASM961 |
| AN970 | Washer, Flat, Large OD (Rev. 6, 4 Dec 1984) | NASM970 |
AN960 is superseded. Current production and new designs should reference NAS1149, which was developed as a direct, size-for-size substitute for AN960 (Revision 20 and later). AN960 part numbers are documented here for legacy drawing cross-reference and MRO support only.
AN960 — Frequently Asked Questions
Is AN960 still an active standard?
No. AN960 was superseded by NAS1149. It remains documented and stocked because many legacy aircraft drawings still call it out, but new designs should specify NAS1149.
Can I substitute a NAS1149 washer for an AN960 washer?
In most cases yes — NAS1149 was written to provide direct substitutes for AN960 washers of Revision 20 and later. Always confirm size and material match against the current NAS1149 interchangeability table before substituting on an active design.
What materials were AN960 washers made from?
Primarily carbon steel with a cadmium plate finish (per MIL-S-7952/QQ-S-698 material and QQ-P-416 finish), and corrosion resistant steel with a passivated finish, identified by a "C" prefix on the part number.
Need AN960 or NAS1149 Washers?
Ananka Fasteners stocks and manufactures both AN960 legacy washers and their current NAS1149 equivalents, with full material traceability.
Request a Quote