The Washer,flat, cataloged under National Stock Number 5310-00-243-9919, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Carver Pump Company. Government technical data includes 8 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 5310-00-243-9919 |
| Primary Part Number | 028-01N0-01-320 |
| Item Name | Washer,flat |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Carver Pump Company |
| Status | ACTIVE |
| Width Across Flats | 0.219 INCHES NOMINAL IN |
| Length | 0.347 INCHES NOMINAL IN |
| Cross-Sectional Shape Style | RECTANGULAR |
| Peripheral Shape Style | RECTANGULAR |
| Material | COPPER ALLOY OVERALL |
| Center Hole Shape Style | ROUND |
| Hole Diameter | 0.531 INCHES NOMINAL IN |
| Thickness | 0.219 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 |
|---|---|
| 028-01N0-01-320 PRIMARY | Carver Pump Company (USA) |
| A-028-01N-002-320 PRIMARY | Carver Pump Company (USA) |
| Reference | Meaning |
|---|---|
| 028-01N0-01-300 | 5/9 Secondary reference Carver Pump Company |
NSN 5310-00-243-9919 is a Washer,flat, manufactured by Carver Pump Company, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-00-243-9919 has 2 manufacturer part numbers on file: 028-01N0-01-320 (Carver Pump Company), A-028-01N-002-320 (Carver Pump Company).
1 possible match (shared part number, not a government interchangeability claim): 5310-00-991-7193. Verify interchangeability with system specifications before substitution.
Key specifications for 028-01N0-01-320: Width Across Flats: 0.219 INCHES NOMINAL IN; Length: 0.347 INCHES NOMINAL IN; Cross-Sectional Shape Style: RECTANGULAR; Peripheral Shape Style: RECTANGULAR. 8 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.