The Stem,fluid Valve, cataloged under National Stock Number 4820-01-175-6456, 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 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 4 items share a part number with this NSN in the catalog (possible match — not a government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 | 4820-01-175-6456 |
| Primary Part Number | 6553-255 PIECE 11 |
| Item Name | Stem,fluid Valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Huntington Ingalls Inc Div Newport News Shipbuilding |
| Status | ACTIVE |
| Largest Outside Diameter | 1.312 INCHES NOMINAL IN |
| Stem Actuating End Type | THREADED EXTERNALLY |
| Material | NICKEL ALLOY |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL Q — CCL Item — Commerce Control List |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| 6553-255 PIECE 11 | Huntington Ingalls Inc Div Newport News Shipbuilding (USA) |
| Reference | Meaning |
|---|---|
| 208-4325303 PIECE 11 | 3/2 Design control — primary reference U.S. Government activity |
| 6553-255 | D/9 Drawing number reference only Huntington Ingalls Inc Div Newport News Shipbuilding |
| 208-4325303 | D/9 Drawing number reference only U.S. Government activity |
NSN 4820-01-175-6456 is a Stem,fluid Valve, manufactured by Huntington Ingalls Inc Div Newport News Shipbuilding, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-175-6456 has 1 manufacturer part number on file: 6553-255 PIECE 11 (Huntington Ingalls Inc Div Newport News Shipbuilding).
4 possible matches (shared part number, not a government interchangeability claim): 4820-01-181-8657, 4820-01-415-3220, 4820-01-415-8298. Verify interchangeability with system specifications before substitution.
Key specifications for 6553-255 PIECE 11: Largest Outside Diameter: 1.312 INCHES NOMINAL IN; Stem Actuating End Type: THREADED EXTERNALLY; Overall Length: 12.750 INCHES NOMINAL IN; Material: NICKEL 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.
NSN 4820-01-175-6456 has DEMIL Code Q. Demilitarization may be required before disposal or transfer to non-military entities.
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.