The Washer,flat, cataloged under National Stock Number 5310-01-497-3994, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Rolls Royce 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 | 5310-01-497-3994 |
| Primary Part Number | NAS620C416 |
| Item Name | Washer,flat |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Rolls Royce Corp |
| Status | ACTIVE |
| Overall Diameter | 0.463 INCHES MINIMUM AND 0.483 INCHES MAXIMUM IN |
| Cross-Sectional Shape Style | RECTANGULAR |
| Peripheral Shape Style | ROUND |
| Material | STEEL CORROSION RESISTING OVERALL |
| Center Hole Shape Style | ROUND |
| Hole Diameter | 0.245 INCHES MINIMUM AND 0.255 INCHES MAXIMUM IN |
| Thickness | 0.063 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 |
|---|---|
| NAS620C416 PRIMARY | Rolls Royce Corp (USA) |
NSN 5310-01-497-3994 is a Washer,flat, manufactured by Rolls Royce Corp, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-497-3994 has 1 manufacturer part number on file: NAS620C416 (Rolls Royce Corp).
1 possible match (shared part number, not a government interchangeability claim): 5310-01-689-3468. Verify interchangeability with system specifications before substitution.
Key specifications for NAS620C416: Overall Diameter: 0.463 INCHES MINIMUM AND 0.483 INCHES MAXIMUM IN; Cross-Sectional Shape Style: RECTANGULAR; Peripheral Shape Style: ROUND; Part Name Assigned by Controlling Agency: WASHER,AIRCRAFT,MATERIAL. 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.