The Core Assembly,fluid Cooler, cataloged under National Stock Number 4420-01-321-2636, 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 Heat Transfer Systems Inc. Government technical data includes 5 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. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4420-01-321-2636 |
| Primary Part Number | 11448-2 BUNDLE/SHELL |
| Item Name | Core Assembly,fluid Cooler |
| FSC / FSG | 4420 / 44 — Heat Exchangers and Steam Condensers |
| Manufacturer | Heat Transfer Systems Inc |
| Status | ACTIVE |
| Heat Transfer Method | INDIRECT |
| Style Designator | STRAIGHT PLAIN TUBE, CYLINDRICAL |
| Core Diameter | 8.000 INCHES NOMINAL IN |
| Core Length | 50.000 INCHES NOMINAL IN |
| Material | COPPER ALLOY 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 |
|---|---|
| B-11448-2-B & B-11448-2-G | Heat Transfer Systems Inc (USA) |
| 11448-2 BUNDLE/SHELL PRIMARY | Heat Transfer Systems Inc (USA) |
NSN 4420-01-321-2636 is a Core Assembly,fluid Cooler, manufactured by Heat Transfer Systems Inc, classified under FSC 4420, Heat Exchangers and Steam Condensers. Status: active.
NSN 4420-01-321-2636 has 2 manufacturer part numbers on file: B-11448-2-B & B-11448-2-G (Heat Transfer Systems Inc), 11448-2 BUNDLE/SHELL (Heat Transfer Systems Inc).
Key specifications for 11448-2 BUNDLE/SHELL: Heat Transfer Method: INDIRECT; Style Designator: STRAIGHT PLAIN TUBE, CYLINDRICAL; Core Diameter: 8.000 INCHES NOMINAL IN; Core Length: 50.000 INCHES NOMINAL IN. 5 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.