The Stem,fluid Valve, cataloged under National Stock Number 4820-01-477-8491, 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 3 items share a part number with this NSN in the catalog (possible match — not a government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 | 4820-01-477-8491 |
| Primary Part Number | 845-7286645 ITEM 61 |
| Item Name | Stem,fluid Valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Naval Sea Systems Command |
| Status | ACTIVE |
| Valve Type for Which Designed | BALL |
| Largest Outside Diameter | 1.050 INCHES MINIMUM AND 1.051 INCHES MAXIMUM IN |
| Stem Actuating End Type | SLOTTED |
| Material | NICKEL AND 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 |
|---|---|
| 845-7286645 ITEM 61 | Naval Sea Systems Command (USA) |
| Reference | Meaning |
|---|---|
| 7286645 | D/9 Drawing number reference only Naval Sea Systems Command |
| 2643-820-03 | D/9 Drawing number reference only U.S. Government activity |
| 2643-820-03 ITEM 61 | 3/2 Design control — primary reference U.S. Government activity |
NSN 4820-01-477-8491 is a Stem,fluid Valve, manufactured by Naval Sea Systems Command, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-477-8491 has 1 manufacturer part number on file: 845-7286645 ITEM 61 (Naval Sea Systems Command).
3 possible matches (shared part number, not a government interchangeability claim): 4820-01-477-8492, 4820-01-627-9871, 4820-01-695-4969. Verify interchangeability with system specifications before substitution.
Key specifications for 845-7286645 ITEM 61: Valve Type for Which Designed: BALL; Largest Outside Diameter: 1.050 INCHES MINIMUM AND 1.051 INCHES MAXIMUM IN; Stem Actuating End Type: SLOTTED; Overall Length: 4.630 INCHES NOMINAL IN. 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.