The Washer,flat, cataloged under National Stock Number 5310-01-596-0551, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. Government technical data includes 11 specifications, cited from the U.S. Government catalog. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-01-596-0551 |
| Item Name | Washer,flat |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Status | ACTIVE |
| Surface Treatment Document and Classification | MIL-T-704, TYPE F MIL SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Overall Diameter | 1.250 INCHES NOMINAL IN |
| Hardness Rating | 65.0 ROCKWELL D MINIMUM AND 70.0 ROCKWELL D MAXIMUM |
| Material Document and Classification | ASTM A108 ASSN STD SINGLE MATERIAL RESPONSE OR ASTM A576 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Cross-Sectional Shape Style | RECTANGULAR |
| Surface Treatment | PAINT OVERALL |
| Peripheral Shape Style | ROUND |
| Material | STEEL OVERALL |
| Center Hole Shape Style | ROUND |
| Hole Diameter | 0.531 INCHES NOMINAL IN |
| Thickness | 0.188 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 |
| Reference | Meaning |
|---|---|
| 13228E4559-1 | 3/2 Design control — primary reference U.S. Government activity |
| 13228E4559 | D/9 Drawing number reference only U.S. Government activity |
NSN 5310-01-596-0551 is a Washer,flat, classified under FSC 5310, Nuts and Washers. Status: active.
Key specifications for 5310-01-596-0551: Surface Treatment Document and Classification: MIL-T-704, TYPE F MIL SPEC SINGLE TREATMENT RESPONSE OVERALL; Overall Diameter: 1.250 INCHES NOMINAL IN; Hardness Rating: 65.0 ROCKWELL D MINIMUM AND 70.0 ROCKWELL D MAXIMUM; Material Document and Classification: ASTM A108 ASSN STD SINGLE MATERIAL RESPONSE OR ASTM A576 ASSN STD SINGLE MATERIAL RESPONSE OVERALL. 11 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.