The Washer,flat, cataloged under National Stock Number 5310-01-228-0595, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. Government technical data includes 9 specifications, cited from the U.S. Government catalog. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 5310-01-228-0595 |
| Item Name | Washer,flat |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Status | ACTIVE |
| Overall Diameter | 0.555 INCHES MINIMUM AND 0.560 INCHES MAXIMUM IN |
| Criticality Code Justification | ZZZY |
| Cross-Sectional Shape Style | RECTANGULAR |
| Peripheral Shape Style | ROUND |
| Material | NICKEL ALLOY OVERALL |
| Center Hole Shape Style | ROUND |
| Hole Diameter | 0.290 INCHES NOMINAL IN |
| Reference Number Differentiating Characteristics | MATERIAL WILL BE IN ACCORDANCE WITH SHIPS PARTS CONTROL CENTER ACTIVITY HX QUALITY CONTROL,MANUFACTURING AND TESTING SPECIFICATIONS |
| 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 | C |
| Reference | Meaning |
|---|---|
| 845-2445088PC203 | 5/1 Secondary reference U.S. Government activity |
| 243028 PC 203 | 5/1 Secondary reference Huntington Ingalls Inc Div Newport News Shipbuilding |
| 845-4497106 PC 203 | 3/1 Design control — primary reference U.S. Government activity |
NSN 5310-01-228-0595 is a Washer,flat, classified under FSC 5310, Nuts and Washers. Status: active.
1 possible match (shared part number, not a government interchangeability claim): 5310-01-379-8411. Verify interchangeability with system specifications before substitution.
Key specifications for 5310-01-228-0595: Overall Diameter: 0.555 INCHES MINIMUM AND 0.560 INCHES MAXIMUM IN; Criticality Code Justification: ZZZY; Cross-Sectional Shape Style: RECTANGULAR; Peripheral Shape Style: ROUND. 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.