The Core Assembly,fluid Cooler, cataloged under National Stock Number 4420-01-428-1774, is classified within Federal Supply Class 4420 (Heat Exchangers and Steam Condensers) of the Furnace, Steam, Drying, Nuclear Reactors group. The manufacturer of record is Fluid Handling Llc. Government technical data includes 4 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 4420-01-428-1774 |
| Primary Part Number | 428208039001 |
| Item Name | Core Assembly,fluid Cooler |
| FSC / FSG | 4420 / 44 — Heat Exchangers and Steam Condensers |
| Manufacturer | Fluid Handling Llc |
| Status | ACTIVE |
| Heat Transfer Method | INDIRECT |
| Style Designator | PLAIN "U" TUBE |
| Core Length | 42.625 INCHES NOMINAL IN |
| Material | STEEL TUBES |
| 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 |
|---|---|
| 509208039001 PIECE 2 | Fluid Handling Llc (USA) |
| 428208039001 PRIMARY | Fluid Handling Llc (USA) |
| Reference | Meaning |
|---|---|
| 428208039001 | 3/9 Design control — primary reference Itt Corporation Dba Itt Standard |
| 509208039001 | D/9 Drawing number reference only Itt Corporation Dba Itt Standard |
| 509208039001 PIECE 2 | 5/9 Secondary reference Itt Corporation Dba Itt Standard |
NSN 4420-01-428-1774 is a Core Assembly,fluid Cooler, manufactured by Fluid Handling Llc, classified under FSC 4420, Heat Exchangers and Steam Condensers. Status: active.
NSN 4420-01-428-1774 has 2 manufacturer part numbers on file: 509208039001 PIECE 2 (Fluid Handling Llc), 428208039001 (Fluid Handling Llc).
1 possible match (shared part number, not a government interchangeability claim): 4420-01-428-6950. Verify interchangeability with system specifications before substitution.
Key specifications for 428208039001: Heat Transfer Method: INDIRECT; Style Designator: PLAIN "U" TUBE; Core Length: 42.625 INCHES NOMINAL IN; End Item Identification: USED ON THE SUPPLY CLASS AOE. 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.