The Piston,valve, cataloged under National Stock Number 4820-01-593-4876, 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 4 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-593-4876 |
| Primary Part Number | 517-8180600-4 |
| Item Name | Piston,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Naval Sea Systems Command |
| Status | ACTIVE |
| Outside Diameter | 4.495 INCHES NOMINAL IN |
| Features Provided | INTEGRAL STEM AND GROOVED |
| Valve Design Control Activity | 53711 |
| Material | NICKEL ALLOY |
| 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 |
|---|---|
| 517-8180600-4 PRIMARY | Naval Sea Systems Command (USA) |
| 73711 8180600 IT EM.4 | Derbyshire Machine & Tool Co (USA) |
NSN 4820-01-593-4876 is a Piston,valve, manufactured by Naval Sea Systems Command, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-593-4876 has 2 manufacturer part numbers on file: 517-8180600-4 (Naval Sea Systems Command), 73711 8180600 IT EM.4 (Derbyshire Machine & Tool Co).
Key specifications for 517-8180600-4: Outside Diameter: 4.495 INCHES NOMINAL IN; Overall Length: 6.550 INCHES NOMINAL IN; Features Provided: INTEGRAL STEM AND GROOVED; Special Features: THIS IS A FLAT, CIRCULAR PISTON WITH A GROVE AND A STEM, DIMENSIONS GIVEN ARE OF THE WELDED TWO PIECES. 4 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.