The Core Assembly,fluid Cooler, cataloged under National Stock Number 4420-00-142-1341, 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 7 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 4420-00-142-1341 |
| Primary Part Number | D8521971 |
| Item Name | Core Assembly,fluid Cooler |
| FSC / FSG | 4420 / 44 — Heat Exchangers and Steam Condensers |
| Manufacturer | General Motors Corp |
| Status | ACTIVE |
| Heat Transfer Method | INDIRECT |
| Effective Heat Transfer Surface Area | 45.8 SQUARE FEET |
| Style Designator | STRUT, RECTANGULAR |
| Material Document and Classification | MIL-C-15726,COMP 70-30 MIL SPEC SINGLE MATERIAL RESPONSE TUBES |
| Tube Quantity | 32 |
| Tubing Outside Diameter | 0.625 INCHES NOMINAL BOTH INLET AND OUTLET TUBE ENDS 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 |
|---|---|
| D8521971 PRIMARY | General Motors Corp (USA) |
| 8521971 PRIMARY | General Motors Corp (USA) |
| J8521965PC24 PRIMARY | General Motors Corp (USA) |
| Reference | Meaning |
|---|---|
| D8521971 | 5/9 Secondary reference General Motors Corp Harrison Radiator Div |
| 8521971 | 5/9 Secondary reference General Motors Corp Harrison Radiator Div |
| J8521965PC24 | 5/9 Secondary reference General Motors Corp Harrison Radiator Div |
NSN 4420-00-142-1341 is a Core Assembly,fluid Cooler, manufactured by General Motors Corp, classified under FSC 4420, Heat Exchangers and Steam Condensers. Status: active.
NSN 4420-00-142-1341 has 3 manufacturer part numbers on file: D8521971 (General Motors Corp), 8521971 (General Motors Corp), J8521965PC24 (General Motors Corp).
1 possible match (shared part number, not a government interchangeability claim): 5965-01-170-9891. Verify interchangeability with system specifications before substitution.
Key specifications for D8521971: Heat Transfer Method: INDIRECT; Effective Heat Transfer Surface Area: 45.8 SQUARE FEET; Style Designator: STRUT, RECTANGULAR; Material Document and Classification: MIL-C-15726,COMP 70-30 MIL SPEC SINGLE MATERIAL RESPONSE TUBES. 7 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.