The Washer,flat, cataloged under National Stock Number 5310-00-255-6477, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Gast Mfg Corp. Government technical data includes 7 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-00-255-6477 |
| Primary Part Number | AA405 |
| Item Name | Washer,flat |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Gast Mfg Corp |
| Status | ACTIVE |
| Overall Diameter | 2.812 INCHES NOMINAL IN |
| Cross-Sectional Shape Style | RECTANGULAR |
| Peripheral Shape Style | ROUND |
| Material | CORK OVERALL |
| Center Hole Shape Style | ROUND |
| Hole Diameter | 2.000 INCHES NOMINAL IN |
| Thickness | 0.125 INCHES NOMINAL IN |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| AA405 PRIMARY | Gast Mfg Corp (USA) |
NSN 5310-00-255-6477 is a Washer,flat, manufactured by Gast Mfg Corp, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-00-255-6477 has 1 manufacturer part number on file: AA405 (Gast Mfg Corp).
1 possible match (shared part number, not a government interchangeability claim): 5330-01-557-5159. Verify interchangeability with system specifications before substitution.
Key specifications for AA405: Overall Diameter: 2.812 INCHES NOMINAL IN; Cross-Sectional Shape Style: RECTANGULAR; Peripheral Shape Style: ROUND; Material: CORK OVERALL. 7 specifications are documented in the U.S. Government catalog.
No hazard code in the DLA record (HMIC N). Hazard information on this page is shown exactly as it appears in the DLA record.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-16.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.