The Washer,recessed, cataloged under National Stock Number 5310-01-591-7256, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. Government technical data includes 7 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-01-591-7256 |
| Item Name | Washer,recessed |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Status | ACTIVE |
| Style Designator | RECESSED |
| Outside Diameter | 0.678 INCHES MINIMUM AND 0.698 INCHES MAXIMUM IN |
| Recess Depth | 0.025 INCHES MINIMUM AND 0.027 INCHES MAXIMUM IN |
| Recess Diameter | 0.435 INCHES MINIMUM AND 0.445 INCHES MAXIMUM IN |
| Surface Treatment | PASSIVATE OVERALL |
| Material | STEEL CORROSION RESISTING OVERALL |
| Hole Diameter | 0.302 INCHES MINIMUM AND 0.306 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 |
|---|---|
| 767040-3 | 3/2 Design control — primary reference U.S. Government activity |
NSN 5310-01-591-7256 is a Washer,recessed, classified under FSC 5310, Nuts and Washers. Status: active.
Key specifications for 5310-01-591-7256: Overall Height: 0.171 INCHES MINIMUM AND 0.181 INCHES MAXIMUM IN; Style Designator: RECESSED; Outside Diameter: 0.678 INCHES MINIMUM AND 0.698 INCHES MAXIMUM IN; Recess Depth: 0.025 INCHES MINIMUM AND 0.027 INCHES MAXIMUM IN. 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.