The Washer,flat, cataloged under National Stock Number 5310-01-476-5598, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Curtiss-Wright Electro-Mechanical Corporation Div Curtiss-Wright Emd. The record lists 1 manufacturer part number 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government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 | Curtiss-Wright Electro-Mechanical Corporation Div Curtiss-Wright Emd (CAGE 04808) |
| Parameter | Value |
|---|---|
| NSN | 5310-01-476-5598 |
| Primary Part Number | 4537B78H11 |
| Item Name | Washer,flat |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Curtiss-Wright Electro-Mechanical Corporation Div Curtiss-Wright Emd |
| Status | ACTIVE |
| 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 |
|---|---|
| 4537B78H11 PRIMARY | Curtiss-Wright Electro-Mechanical Corporation Div Curtiss-Wright Emd (USA) |
| Reference | Meaning |
|---|---|
| 4D98243ITEM86 | 5/9 Secondary reference Curtiss-Wright Electro-Mechanical Corporation Div Curtiss-Wright Emd |
| 4537B78 | D/9 Drawing number reference only Curtiss-Wright Electro-Mechanical Corporation Div Curtiss-Wright Emd |
| 4D98243 | D/9 Drawing number reference only Curtiss-Wright Electro-Mechanical Corporation Div Curtiss-Wright Emd |
NSN 5310-01-476-5598 is a Washer,flat, manufactured by Curtiss-Wright Electro-Mechanical Corporation Div Curtiss-Wright Emd, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-476-5598 has 1 manufacturer part number on file: 4537B78H11 (Curtiss-Wright Electro-Mechanical Corporation Div Curtiss-Wright Emd).
2 possible matches (shared part number, not a government interchangeability claim): 5310-01-476-5600, 5310-01-476-5608. 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.