The Stem,fluid Valve, cataloged under National Stock Number 4820-01-524-1890, 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 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government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.
| Parameter | Value |
|---|---|
| NSN | 4820-01-524-1890 |
| Primary Part Number | 506-7503537 2.5IN PART NO 17 |
| Item Name | Stem,fluid Valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Naval Sea Systems Command |
| Status | ACTIVE |
| Valve Type for Which Designed | STOP-LIFT-CHECK |
| Material Document and Classification | QQ-N-286 FED SPEC SINGLE MATERIAL RESPONSE |
| Valve Size for Which Designed | 2.500 INCHES IN |
| 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 |
|---|---|
| 506-7503537 2.5IN PART NO 17 PRIMARY | Naval Sea Systems Command (USA) |
| Reference | Meaning |
|---|---|
| 7503537 | D/9 Drawing number reference only Huntington Ingalls Inc Div Newport News Shipbuilding |
NSN 4820-01-524-1890 is a Stem,fluid Valve, manufactured by Naval Sea Systems Command, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-524-1890 has 1 manufacturer part number on file: 506-7503537 2.5IN PART NO 17 (Naval Sea Systems Command).
2 possible matches (shared part number, not a government interchangeability claim): 4820-01-524-1899, 4820-01-524-1901. Verify interchangeability with system specifications before substitution.
Key specifications for 506-7503537 2.5IN PART NO 17: Valve Type for Which Designed: STOP-LIFT-CHECK; Material Document and Classification: QQ-N-286 FED SPEC SINGLE MATERIAL RESPONSE; Valve Size for Which Designed: 2.500 INCHES IN; End Item Identification: 4820-01-524-1785; VALVE MANIFOLD ASSEMBLY. 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.