The Washer,lock, cataloged under National Stock Number 5310-00-285-7040, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. Government technical data includes 5 specifications, cited from the U.S. Government catalog. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 5310-00-285-7040 |
| Item Name | Washer,lock |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Status | ACTIVE |
| Outside Diameter | 0.591 INCHES MAXIMUM IN |
| Material Thickness | 0.078 INCHES MINIMUM AND 0.088 INCHES MAXIMUM IN |
| Surface Treatment | CADMIUM OVERALL |
| Material | STEEL OVERALL |
| Hole Diameter | 0.319 INCHES MINIMUM AND 0.333 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 | X |
| Reference | Meaning |
|---|---|
| NAS144-31 | 5/9 Secondary reference U.S. Government activity |
| MS122033 | 2/2 Government specification standardization U.S. Government activity |
NSN 5310-00-285-7040 is a Washer,lock, classified under FSC 5310, Nuts and Washers. Status: active.
1 possible match (shared part number, not a government interchangeability claim): 5310-00-407-4153. Verify interchangeability with system specifications before substitution.
Key specifications for 5310-00-285-7040: Outside Diameter: 0.591 INCHES MAXIMUM IN; Material Thickness: 0.078 INCHES MINIMUM AND 0.088 INCHES MAXIMUM IN; Surface Treatment: CADMIUM OVERALL; End Item Identification: MRAP - UNIQUE NSN - RG33 CAT I. 5 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.