The Disk,valve, cataloged under National Stock Number 4820-01-497-5809, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Naval Sea Systems Command. Government technical data includes 10 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 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-497-5809 |
| Primary Part Number | 803-5348084-4XX-03 |
| Item Name | Disk,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Naval Sea Systems Command |
| Status | ACTIVE |
| Pressure Rating | 700.0 POUNDS PER SQUARE INCH (PSI) NOMINAL LBS |
| Shoulder Width | 1.220 INCHES NOMINAL IN |
| Shoulder Height | 0.750 INCHES NOMINAL IN |
| Style Designator | PLUG |
| Seat Angle | 30.0 DEGREES NOMINAL |
| Nominal Thread Size | 2.500 INCHES IN |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 16 |
| Material | NICKEL ALLOY 400 |
| Thread Series Designator | UN |
| 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 |
|---|---|
| 803-5348084-4XX-03 PRIMARY | Naval Sea Systems Command (USA) |
NSN 4820-01-497-5809 is a Disk,valve, manufactured by Naval Sea Systems Command, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-497-5809 has 1 manufacturer part number on file: 803-5348084-4XX-03 (Naval Sea Systems Command).
1 possible match (shared part number, not a government interchangeability claim): 4820-01-670-3354. Verify interchangeability with system specifications before substitution.
Key specifications for 803-5348084-4XX-03: Overall Height: 4.120 INCHES NOMINAL IN; Pressure Rating: 700.0 POUNDS PER SQUARE INCH (PSI) NOMINAL LBS; Shoulder Width: 1.220 INCHES NOMINAL IN; Shoulder Height: 0.750 INCHES NOMINAL IN. 10 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.