The Washer,flat, cataloged under National Stock Number 5310-01-528-4057, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Mcmaster-Carr Supply Co. Government technical data includes 2 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 5310-01-528-4057 |
| Primary Part Number | 90089A315 |
| Item Name | Washer,flat |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Mcmaster-Carr Supply Co |
| Status | ACTIVE |
| Outside Radius | 0.500 INCHES NOMINAL IN |
| Thickness | 0.015 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 |
|---|---|
| 90089A315 PRIMARY | Mcmaster-Carr Supply Co (USA) |
| Reference | Meaning |
|---|---|
| 90089A315 | 5/9 Secondary reference Mcmaster-Carr Supply Co |
NSN 5310-01-528-4057 is a Washer,flat, manufactured by Mcmaster-Carr Supply Co, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-528-4057 has 1 manufacturer part number on file: 90089A315 (Mcmaster-Carr Supply Co).
Key specifications for 90089A315: Outside Radius: 0.500 INCHES NOMINAL IN; Special Features: 0.25 INCH SCREW SIZE AND MATERIAL IS GREY HARD FIBER IN; Part Name Assigned by Controlling Agency: GREY HARD FIBER WASHER; End Item Identification: TECI AN/BQS15A0003 PUMA UNIT 6 CONSOLE. 2 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.