The Stem,fluid Valve, cataloged under National Stock Number 4820-01-104-9479, 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 3 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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.
| Parameter | Value |
|---|---|
| NSN | 4820-01-104-9479 |
| Primary Part Number | 845-4558721 ITEM 6 |
| Item Name | Stem,fluid Valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Naval Sea Systems Command |
| Status | ACTIVE |
| Largest Outside Diameter | 1.622 INCHES NOMINAL IN |
| Material Document and Classification | MIL-B-24059 MIL SPEC SINGLE MATERIAL RESPONSE |
| Material | COPPER 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 |
|---|---|
| 845-4558721 ITEM 6 | Naval Sea Systems Command (USA) |
| Reference | Meaning |
|---|---|
| 845-4558721 ITEM 6 | 5/2 Secondary reference U.S. Government activity |
| 2642-601-01 ITEM 6 | 3/2 Design control — primary reference U.S. Government activity |
| 845-4558721 | D/9 Drawing number reference only U.S. Government activity |
NSN 4820-01-104-9479 is a Stem,fluid Valve, manufactured by Naval Sea Systems Command, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-104-9479 has 1 manufacturer part number on file: 845-4558721 ITEM 6 (Naval Sea Systems Command).
1 possible match (shared part number, not a government interchangeability claim): 4820-01-211-0991. Verify interchangeability with system specifications before substitution.
Key specifications for 845-4558721 ITEM 6: Largest Outside Diameter: 1.622 INCHES NOMINAL IN; Material Document and Classification: MIL-B-24059 MIL SPEC SINGLE MATERIAL RESPONSE; Overall Length: 6.500 INCHES NOMINAL IN; Material: COPPER ALLOY. 3 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.