The Core Assembly,fluid Cooler, cataloged under National Stock Number 4420-01-121-0630, 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 Caterpillar Inc Div Caterpillar Defense. Government technical data includes 10 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 4420-01-121-0630 |
| Primary Part Number | 3N4363 |
| Item Name | Core Assembly,fluid Cooler |
| FSC / FSG | 4420 / 44 — Heat Exchangers and Steam Condensers |
| Manufacturer | Caterpillar Inc Div Caterpillar Defense |
| Status | ACTIVE |
| Core Width | 5.841 INCHES NOMINAL IN |
| Heat Transfer Method | INDIRECT |
| Style Designator | STRAIGHT FINNED TUBE, RECTANGULAR |
| Tube Quantity | 82 |
| Tube Attachment Method | BRAZED BOTH ENDS |
| Core Length | 16.940 INCHES NOMINAL IN |
| Tubing Outside Diameter | 0.375 INCHES NOMINAL LOCATION NOT OTHERWISE SPECIFIED IN |
| Cubic Measure | 4.000 CUBIC FEET |
| Core Thickness | 6.248 INCHES NOMINAL IN |
| Material | COPPER ALLOY 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 |
|---|---|
| 3N4363 PRIMARY | Caterpillar Inc Div Caterpillar Defense (USA) |
| Reference | Meaning |
|---|---|
| 3-1035C | C/1 Advisory reference — outside the item-of-supply concept Uncle Bens Inc Dba Uncle Bens Inc. |
NSN 4420-01-121-0630 is a Core Assembly,fluid Cooler, manufactured by Caterpillar Inc Div Caterpillar Defense, classified under FSC 4420, Heat Exchangers and Steam Condensers. Status: active.
NSN 4420-01-121-0630 has 1 manufacturer part number on file: 3N4363 (Caterpillar Inc Div Caterpillar Defense).
Key specifications for 3N4363: Core Width: 5.841 INCHES NOMINAL IN; Heat Transfer Method: INDIRECT; Style Designator: STRAIGHT FINNED TUBE, RECTANGULAR; Tube Quantity: 82. 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.