The Washer,flat, cataloged under National Stock Number 5310-00-121-2979, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Brp Us Inc. Government technical data includes 7 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 5310-00-121-2979 |
| Primary Part Number | 203622 |
| Item Name | Washer,flat |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Brp Us Inc |
| Status | ACTIVE |
| Overall Diameter | 0.812 INCHES NOMINAL IN |
| Cross-Sectional Shape Style | RECTANGULAR |
| Peripheral Shape Style | ROUND |
| Material | STEEL OVERALL |
| Center Hole Shape Style | ROUND |
| Hole Diameter | 0.266 INCHES NOMINAL IN |
| Thickness | 0.062 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 |
|---|---|
| 203622 PRIMARY | Brp Us Inc (USA) |
| 203622 | Lewmar Ltd (GBR) |
| Reference | Meaning |
|---|---|
| 203622 | 5/9 Secondary reference Simpson-Lawrence Ltd Johnson and Evi Rude Outboard Motors |
| 203622 | 5/9 Secondary reference U.S. Government activity |
| 203622 | 5/9 Secondary reference Outboard Marine Corp Johnson Motors Div |
NSN 5310-00-121-2979 is a Washer,flat, manufactured by Brp Us Inc, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-00-121-2979 has 2 manufacturer part numbers on file: 203622 (Brp Us Inc), 203622 (Lewmar Ltd).
1 possible match (shared part number, not a government interchangeability claim): 5310-00-803-7477. Verify interchangeability with system specifications before substitution.
Key specifications for 203622: Overall Diameter: 0.812 INCHES NOMINAL IN; Cross-Sectional Shape Style: RECTANGULAR; Peripheral Shape Style: ROUND; Material: STEEL 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.