The Washer,flat, cataloged under National Stock Number 5310-01-238-2839, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Dressta North America Ltd. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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.
| Item Name | Washer,flat |
| FSC / FSG | 5310 — Nuts and Washers (FSG 53) |
| Manufacturers | Dressta North America Ltd (CAGE 45RP7) |
| Parameter | Value |
|---|---|
| NSN | 5310-01-238-2839 |
| Primary Part Number | 66121 |
| Item Name | Washer,flat |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Dressta North America Ltd |
| Status | ACTIVE |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Part Number | Manufacturer |
|---|---|
| 66121 PRIMARY | Dressta North America Ltd (USA) |
| Reference | Meaning |
|---|---|
| D66121 | 5/9 Secondary reference Komatsu America Corporation |
| 66121 | 5/9 Secondary reference Komatsu America Corporation |
NSN 5310-01-238-2839 is a Washer,flat, manufactured by Dressta North America Ltd, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-238-2839 has 1 manufacturer part number on file: 66121 (Dressta North America Ltd).
1 possible match (shared part number, not a government interchangeability claim): 5950-01-392-9996. Verify interchangeability with system specifications before substitution.
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.