The Core Assembly,fluid Cooler, cataloged under National Stock Number 4420-01-085-8887, 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 Space Dynamics Corp. Government technical data includes 6 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4420-01-085-8887 |
| Primary Part Number | 81-01 |
| Item Name | Core Assembly,fluid Cooler |
| FSC / FSG | 4420 / 44 — Heat Exchangers and Steam Condensers |
| Manufacturer | Space Dynamics Corp |
| Status | ACTIVE |
| Heat Transfer Method | INDIRECT |
| Style Designator | STRAIGHT PLAIN TUBE, CYLINDRICAL |
| Material Document and Classification | MIL-C-17557D MIL SPEC ALL MATERIAL RESPONSES OVERALL |
| Core Diameter | 3.000 INCHES NOMINAL IN |
| Core Length | 9.500 INCHES NOMINAL IN |
| Material | COPPER ALLOY AND NICKEL ALLOY SHELL |
| 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 |
|---|---|
| 81-01 PRIMARY | Space Dynamics Corp (USA) |
| SDC-P81-01 PIECE 1 | Space Dynamics Corp (USA) |
| Reference | Meaning |
|---|---|
| SDC-P81-01 | D/9 Drawing number reference only Space Dynamics Corp |
NSN 4420-01-085-8887 is a Core Assembly,fluid Cooler, manufactured by Space Dynamics Corp, classified under FSC 4420, Heat Exchangers and Steam Condensers. Status: active.
NSN 4420-01-085-8887 has 2 manufacturer part numbers on file: 81-01 (Space Dynamics Corp), SDC-P81-01 PIECE 1 (Space Dynamics Corp).
Key specifications for 81-01: Heat Transfer Method: INDIRECT; Style Designator: STRAIGHT PLAIN TUBE, CYLINDRICAL; Material Document and Classification: MIL-C-17557D MIL SPEC ALL MATERIAL RESPONSES OVERALL; Core Diameter: 3.000 INCHES NOMINAL IN. 6 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.