The Stem,fluid Valve, cataloged under National Stock Number 4820-01-253-2838, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Huntington Ingalls Inc Div Newport News Shipbuilding. Government technical data includes 4 specifications, cited from the U.S. Government catalog. The record lists 3 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 4 items share a part number with this NSN in the catalog (possible match — not a government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 | 4820-01-253-2838 |
| Primary Part Number | 255122 PIECE 6 |
| Item Name | Stem,fluid Valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Huntington Ingalls Inc Div Newport News Shipbuilding |
| Status | ACTIVE |
| Valve Type for Which Designed | BALL |
| Stem Actuating End Type | THREADED EXTERNALLY |
| Valve Size for Which Designed | 4.000 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 |
|---|---|
| 255587 PIECE 11 | Huntington Ingalls Inc Div Newport News Shipbuilding (USA) |
| 255122 PIECE 6 PRIMARY | Huntington Ingalls Inc Div Newport News Shipbuilding (USA) |
| 253122 PIECE 6 | Huntington Ingalls Inc Div Newport News Shipbuilding (USA) |
| Reference | Meaning |
|---|---|
| 26M00-81RR01 ASSEMBLY MS | 5/2 Secondary reference U.S. Government activity |
| 2640-806X5 PIECE 11 | 5/2 Secondary reference U.S. Government activity |
| SS845-2445483 ASSEMBLY MS | 5/2 Secondary reference U.S. Government activity |
| 255122 | D/9 Drawing number reference only Huntington Ingalls Inc Div Newport News Shipbuilding |
NSN 4820-01-253-2838 is a Stem,fluid Valve, manufactured by Huntington Ingalls Inc Div Newport News Shipbuilding, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-253-2838 has 3 manufacturer part numbers on file: 255587 PIECE 11 (Huntington Ingalls Inc Div Newport News Shipbuilding), 255122 PIECE 6 (Huntington Ingalls Inc Div Newport News Shipbuilding), 253122 PIECE 6 (Huntington Ingalls Inc Div Newport News Shipbuilding).
4 possible matches (shared part number, not a government interchangeability claim): 6640-01-272-2030, 4820-01-627-6613, 5995-01-689-4127. Verify interchangeability with system specifications before substitution.
Key specifications for 255122 PIECE 6: Valve Type for Which Designed: BALL; Stem Actuating End Type: THREADED EXTERNALLY; Valve Size for Which Designed: 4.000 INCHES IN; Material: NICKEL ALLOY. 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.