The Stem,fluid Valve, cataloged under National Stock Number 4820-01-409-1252, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. Government technical data includes 6 specifications, cited from the U.S. Government catalog. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 4820-01-409-1252 |
| Item Name | Stem,fluid Valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Status | ACTIVE |
| Valve Type for Which Designed | BALL |
| Largest Outside Diameter | 1.998 INCHES NOMINAL IN |
| Stem Actuating End Type | SLOTTED |
| Features Provided | SPLINED |
| Valve Size for Which Designed | 4.000 INCHES IN |
| 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 |
| Reference | Meaning |
|---|---|
| 845-2180942 | D/9 Drawing number reference only U.S. Government activity |
| 2640-749 PIECE 10 | 3/2 Design control — primary reference U.S. Government activity |
| 845-2180942 PIECE 10 | 3/2 Design control — primary reference U.S. Government activity |
NSN 4820-01-409-1252 is a Stem,fluid Valve, classified under FSC 4820, Valves, Nonpowered. Status: active.
1 possible match (shared part number, not a government interchangeability claim): 4820-01-410-8001. Verify interchangeability with system specifications before substitution.
Key specifications for 4820-01-409-1252: Valve Type for Which Designed: BALL; Largest Outside Diameter: 1.998 INCHES NOMINAL IN; Stem Actuating End Type: SLOTTED; Overall Length: 9.812 INCHES NOMINAL IN. 6 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.