The Core Assembly,fluid Cooler, cataloged under National Stock Number 4420-00-371-9992, 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 Rolls-Royce Solutions America Inc. Government technical data includes 11 specifications, cited from the U.S. Government catalog. The record lists 3 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 6 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4420-00-371-9992 |
| Primary Part Number | 8547557 |
| Item Name | Core Assembly,fluid Cooler |
| FSC / FSG | 4420 / 44 — Heat Exchangers and Steam Condensers |
| Manufacturer | Rolls-Royce Solutions America Inc |
| Status | ACTIVE |
| Core Width | 6.844 INCHES NOMINAL IN |
| Heat Transfer Method | INDIRECT |
| Effective Heat Transfer Surface Area | 1.9 SQUARE FEET |
| Core Height | 1.406 INCHES NOMINAL IN |
| Style Designator | PLATE, OBLONG |
| Material Document and Classification | MIL-C-15726,COMP 70-30 MIL SPEC SINGLE MATERIAL RESPONSE TUBES |
| Tube Quantity | 4 |
| Tube Attachment Method | BRAZED BOTH ENDS |
| Core Length | 10.563 INCHES NOMINAL IN |
| Nondefinitive Spec/std Data | B TYPE |
| 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 |
|---|---|
| 8547557 | Geneva, Llc Dba Covington Power Services (USA) |
| 8547557 PRIMARY | Rolls-Royce Solutions America Inc (USA) |
| 8547557 | Hatch & Kirk, Inc. (USA) |
| Reference | Meaning |
|---|---|
| 8508765 | 5/9 Secondary reference Rolls-Royce Solutions America Inc |
| 8501517 | 5/9 Secondary reference Hatch & Kirk, Inc. |
| 8508765 | 5/9 Secondary reference General Motors Corp Harrison Radiator Div |
| MIL-C-15730TYPEB | 4/1 Identification reference U.S. Government activity |
| 8508765 | 5/9 Secondary reference General Motors Corp |
| A8501517 | 5/9 Secondary reference General Motors Corp |
NSN 4420-00-371-9992 is a Core Assembly,fluid Cooler, manufactured by Rolls-Royce Solutions America Inc, classified under FSC 4420, Heat Exchangers and Steam Condensers. Status: active.
NSN 4420-00-371-9992 has 3 manufacturer part numbers on file: 8547557 (Geneva, Llc Dba Covington Power Services), 8547557 (Rolls-Royce Solutions America Inc), 8547557 (Hatch & Kirk, Inc.).
Key specifications for 8547557: Core Width: 6.844 INCHES NOMINAL IN; Heat Transfer Method: INDIRECT; Effective Heat Transfer Surface Area: 1.9 SQUARE FEET; Core Height: 1.406 INCHES NOMINAL IN. 11 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.