The Washer,recessed, cataloged under National Stock Number 5310-01-034-2778, 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 5 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-01-034-2778 |
| Primary Part Number | A028-13N0-01-301 |
| Item Name | Washer,recessed |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Carver Pump Company |
| Status | ACTIVE |
| Style Designator | RECESSED |
| Outside Diameter | 2.000 INCHES NOMINAL IN |
| Recess Depth | 0.125 INCHES NOMINAL IN |
| Recess Diameter | 1.438 INCHES NOMINAL IN |
| Hole Diameter | 0.891 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 |
|---|---|
| A028-13N0-01-301 PRIMARY | Carver Pump Company (USA) |
| Reference | Meaning |
|---|---|
| D13N0-99-004PC13 | 5/9 Secondary reference Carver Pump Company |
NSN 5310-01-034-2778 is a Washer,recessed, manufactured by Carver Pump Company, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-034-2778 has 1 manufacturer part number on file: A028-13N0-01-301 (Carver Pump Company).
Key specifications for A028-13N0-01-301: Overall Height: 0.500 INCHES NOMINAL IN; Style Designator: RECESSED; Outside Diameter: 2.000 INCHES NOMINAL IN; Recess Depth: 0.125 INCHES NOMINAL IN. 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.