The Core Assembly,fluid Cooler, cataloged under National Stock Number 4420-00-142-1348, 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 General Motors Corp. Government technical data includes 10 specifications, cited from the U.S. Government catalog. The record lists 4 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through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4420-00-142-1348 |
| Primary Part Number | D8521581 |
| Item Name | Core Assembly,fluid Cooler |
| FSC / FSG | 4420 / 44 — Heat Exchangers and Steam Condensers |
| Manufacturer | General Motors Corp |
| Status | ACTIVE |
| Core Width | 3.070 INCHES NOMINAL IN |
| Heat Transfer Method | INDIRECT |
| Effective Heat Transfer Surface Area | 5.4 SQUARE FEET |
| Core Height | 3.490 INCHES NOMINAL IN |
| Style Designator | PLATE, OBLONG |
| Material Document and Classification | MIL-C-15726,COMP 70-30 MIL SPEC SINGLE MATERIAL RESPONSE TUBES |
| Core Diameter | 3.070 INCHES NOMINAL IN |
| Tube Quantity | 12 |
| Core Length | 8.813 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 |
|---|---|
| D8521581 PRIMARY | General Motors Corp (USA) |
| E8521569PC18 PRIMARY | General Motors Corp (USA) |
| 8521581 | General Electric Co Apparatus and Engineering Service Organization Div (USA) |
| 8521581 PRIMARY | General Motors Corp (USA) |
| Reference | Meaning |
|---|---|
| D8521581 | 5/9 Secondary reference General Motors Corp Harrison Radiator Div |
| 8521581 | 5/9 Secondary reference General Motors Corp Harrison Radiator Div |
| D3183618 | 5/2 Secondary reference U.S. Government activity |
| E8521569PC18 | 5/9 Secondary reference General Motors Corp Harrison Radiator Div |
NSN 4420-00-142-1348 is a Core Assembly,fluid Cooler, manufactured by General Motors Corp, classified under FSC 4420, Heat Exchangers and Steam Condensers. Status: active.
NSN 4420-00-142-1348 has 4 manufacturer part numbers on file: D8521581 (General Motors Corp), E8521569PC18 (General Motors Corp), 8521581 (General Electric Co Apparatus and Engineering Service Organization Div), 8521581 (General Motors Corp).
Key specifications for D8521581: Core Width: 3.070 INCHES NOMINAL IN; Heat Transfer Method: INDIRECT; Effective Heat Transfer Surface Area: 5.4 SQUARE FEET; Core Height: 3.490 INCHES NOMINAL IN. 10 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.