The Core Assembly,fluid Cooler, cataloged under National Stock Number 4420-01-504-5631, 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 9 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through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 4 items share a part number with this NSN in the catalog (possible match — not a government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 | 4420-01-504-5631 |
| Primary Part Number | 4-592-21-039-061 |
| Item Name | Core Assembly,fluid Cooler |
| FSC / FSG | 4420 / 44 — Heat Exchangers and Steam Condensers |
| Manufacturer | Fluid Handling Llc |
| Status | ACTIVE |
| Core Width | 6.500 INCHES NOMINAL IN |
| Heat Transfer Method | INDIRECT |
| Core Height | 26.125 INCHES NOMINAL IN |
| Style Designator | PLATE, RECTANGULAR OR SQUARE |
| Material Document and Classification | AISI316 ASSN STD SINGLE MATERIAL RESPONSE PLATES |
| Core Diameter | 48.000 INCHES NOMINAL IN |
| Tube Quantity | 39 |
| Core Length | 6.500 INCHES NOMINAL IN |
| Material | STEEL COMP 316 PLATES |
| 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 |
|---|---|
| 4-592-21-039-061 | Fluid Handling Llc (USA) |
| 5-613-21-039-006 PC NO 2 | Fluid Handling Llc (USA) |
| Reference | Meaning |
|---|---|
| 5-613-21-039-006 | D/9 Drawing number reference only Itt Corporation Dba Itt Standard |
| 4-592-21-039-061 REV A | D/9 Drawing number reference only Itt Corporation Dba Itt Standard |
| 4-592-21-039-061 | 3/9 Design control — primary reference Itt Corporation Dba Itt Standard |
| 5-613-21-039-006 PC NO 2 | 5/9 Secondary reference Itt Corporation Dba Itt Standard |
NSN 4420-01-504-5631 is a Core Assembly,fluid Cooler, manufactured by Fluid Handling Llc, classified under FSC 4420, Heat Exchangers and Steam Condensers. Status: active.
NSN 4420-01-504-5631 has 2 manufacturer part numbers on file: 4-592-21-039-061 (Fluid Handling Llc), 5-613-21-039-006 PC NO 2 (Fluid Handling Llc).
4 possible matches (shared part number, not a government interchangeability claim): 4420-01-504-5634, 4420-01-504-6517, 4420-01-504-6519. Verify interchangeability with system specifications before substitution.
Key specifications for 4-592-21-039-061: Core Width: 6.500 INCHES NOMINAL IN; Heat Transfer Method: INDIRECT; Core Height: 26.125 INCHES NOMINAL IN; Style Designator: PLATE, RECTANGULAR OR SQUARE. 9 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.