The Washer,flat, cataloged under National Stock Number 5310-01-299-4989, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Cat Pumps (uk) Ltd. The record lists 3 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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.
| Item Name | Washer,flat |
| FSC / FSG | 5310 — Nuts and Washers (FSG 53) |
| Manufacturers | Cat Pumps (uk) Ltd (CAGE U3374); Slce Watermakers (CAGE F9758) |
| Parameter | Value |
|---|---|
| NSN | 5310-01-299-4989 |
| Primary Part Number | 277 ITEM 26 |
| Item Name | Washer,flat |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Cat Pumps (uk) 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 |
|---|---|
| 277 ITEM 26 | Cat Pumps (uk) Ltd (GBR) |
| 44041 | Cat Pumps (uk) Ltd (GBR) |
| 710018-65 | Slce Watermakers (FRA) |
| Reference | Meaning |
|---|---|
| 711033-098 | 5/9 Secondary reference Slce Watermakers |
| 44041 | C/1 Advisory reference — outside the item-of-supply concept Bourns Inc |
| 44041 | 3/9 Design control — primary reference Cat Pumps Corp |
NSN 5310-01-299-4989 is a Washer,flat, manufactured by Cat Pumps (uk) Ltd, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-299-4989 has 3 manufacturer part numbers on file: 277 ITEM 26 (Cat Pumps (uk) Ltd), 44041 (Cat Pumps (uk) Ltd), 710018-65 (Slce Watermakers).
1 possible match (shared part number, not a government interchangeability claim): 3110-01-299-7246. 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.