The Core Assembly,fluid Cooler, cataloged under National Stock Number 4420-01-273-1383, 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 Borg-Warner Industrial Products Inc Mechanical Seal Div. Government technical data includes 6 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 4420-01-273-1383 |
| Primary Part Number | 261721 NX |
| Item Name | Core Assembly,fluid Cooler |
| FSC / FSG | 4420 / 44 — Heat Exchangers and Steam Condensers |
| Manufacturer | Borg-Warner Industrial Products Inc Mechanical Seal Div |
| Status | ACTIVE |
| Heat Transfer Method | INDIRECT |
| Effective Heat Transfer Surface Area | 1.75 SQUARE FEET |
| Style Designator | PLAIN COILED TUBE |
| Core Length | 7.562 INCHES NOMINAL IN |
| Tubing Outside Diameter | 0.500 INCHES NOMINAL LOCATION NOT OTHERWISE SPECIFIED IN |
| Material | STEEL OVERALL |
| 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 |
|---|---|
| 261721 NX PRIMARY | Borg-Warner Industrial Products Inc Mechanical Seal Div (USA) |
| Reference | Meaning |
|---|---|
| 48691004 | C/1 Advisory reference — outside the item-of-supply concept U.S. Government activity |
NSN 4420-01-273-1383 is a Core Assembly,fluid Cooler, manufactured by Borg-Warner Industrial Products Inc Mechanical Seal Div, classified under FSC 4420, Heat Exchangers and Steam Condensers. Status: active.
NSN 4420-01-273-1383 has 1 manufacturer part number on file: 261721 NX (Borg-Warner Industrial Products Inc Mechanical Seal Div).
Key specifications for 261721 NX: Heat Transfer Method: INDIRECT; Effective Heat Transfer Surface Area: 1.75 SQUARE FEET; Style Designator: PLAIN COILED TUBE; Core Length: 7.562 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.