The Core Assembly,fluid Cooler, cataloged under National Stock Number 4420-01-231-6953, 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 8 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 4420-01-231-6953 |
| Primary Part Number | 414405066001 |
| 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 | STRAIGHT PLAIN TUBE, CYLINDRICAL |
| Tube Quantity | 48 |
| Core Length | 66.000 INCHES NOMINAL IN |
| Tubing Outside Diameter | 0.375 INCHES NOMINAL BOTH INLET AND OUTLET TUBE ENDS IN |
| Material | COPPER ALLOY TUBES |
| Material | COPPER ALLOY TUBE SHEET |
| Material | BRASS 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 |
|---|---|
| 503605066001 PIECE 2 | Fluid Handling Llc (USA) |
| 414405066001 PRIMARY | Fluid Handling Llc (USA) |
| Reference | Meaning |
|---|---|
| 503605066001 PIECE 2 | 5/9 Secondary reference Itt Corporation Dba Itt Standard |
| 503605066001 | D/9 Drawing number reference only Itt Corporation Dba Itt Standard |
| 414405066001 | 3/9 Design control — primary reference Itt Corporation Dba Itt Standard |
NSN 4420-01-231-6953 is a Core Assembly,fluid Cooler, manufactured by Fluid Handling Llc, classified under FSC 4420, Heat Exchangers and Steam Condensers. Status: active.
NSN 4420-01-231-6953 has 2 manufacturer part numbers on file: 503605066001 PIECE 2 (Fluid Handling Llc), 414405066001 (Fluid Handling Llc).
1 possible match (shared part number, not a government interchangeability claim): 3040-01-231-7095. Verify interchangeability with system specifications before substitution.
Key specifications for 414405066001: Heat Transfer Method: INDIRECT; Style Designator: STRAIGHT PLAIN TUBE, CYLINDRICAL; Tube Quantity: 48; Core Length: 66.000 INCHES NOMINAL IN. 8 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.