The Washer,flat, cataloged under National Stock Number 5310-01-497-3983, 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 9 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 | 5310-01-497-3983 |
| Primary Part Number | NAS1149C0663R |
| Item Name | Washer,flat |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Rolls Royce Corp |
| Status | ACTIVE |
| Overall Diameter | 0.620 INCHES MINIMUM AND 0.645 INCHES MAXIMUM IN |
| Criticality Code Justification | AGAV |
| Material Document and Classification | MIL-S-5059 1/4 HARD (125 KSI) MIL SPEC ALL MATERIAL RESPONSES OVERALL |
| Cross-Sectional Shape Style | RECTANGULAR |
| Peripheral Shape Style | ROUND |
| Material | STEEL COMP 301 OVERALL |
| Center Hole Shape Style | ROUND |
| Hole Diameter | 0.380 INCHES MINIMUM AND 0.400 INCHES MAXIMUM IN |
| Thickness | 0.061 INCHES MINIMUM AND 0.065 INCHES MAXIMUM IN |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | Y |
| Part Number | Manufacturer |
|---|---|
| NAS1149C0663R PRIMARY | Rolls Royce Corp (USA) |
NSN 5310-01-497-3983 is a Washer,flat, manufactured by Rolls Royce Corp, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-497-3983 has 1 manufacturer part number on file: NAS1149C0663R (Rolls Royce Corp).
1 possible match (shared part number, not a government interchangeability claim): 5310-01-667-7758. Verify interchangeability with system specifications before substitution.
Key specifications for NAS1149C0663R: Overall Diameter: 0.620 INCHES MINIMUM AND 0.645 INCHES MAXIMUM IN; Criticality Code Justification: AGAV; Material Document and Classification: MIL-S-5059 1/4 HARD (125 KSI) MIL SPEC ALL MATERIAL RESPONSES OVERALL; Cross-Sectional Shape Style: RECTANGULAR. 9 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.