The Core Assembly,fluid Cooler, cataloged under National Stock Number 4420-01-221-8944, 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 Fluid Handling Llc. Government technical data includes 12 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through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4420-01-221-8944 |
| Primary Part Number | 4M848A15 PIECE 3 |
| Item Name | Core Assembly,fluid Cooler |
| FSC / FSG | 4420 / 44 — Heat Exchangers and Steam Condensers |
| Manufacturer | Fluid Handling Llc |
| Status | ACTIVE |
| Heat Transfer Method | INDIRECT |
| Style Designator | STRAIGHT PLAIN TUBE, CYLINDRICAL |
| Material Document and Classification | MIL-C-15726 MIL SPEC SINGLE MATERIAL RESPONSE TUBE SHEET |
| Material Document and Classification | MIL-T-15005 MIL SPEC SINGLE MATERIAL RESPONSE TUBES |
| Material Document and Classification | QQ-B-613 FED SPEC SINGLE MATERIAL RESPONSE PLATES |
| Core Diameter | 10.500 INCHES NOMINAL IN |
| Tube Quantity | 170 |
| Tube Attachment Method | EXPANDED BOTH ENDS |
| Core Length | 47.875 INCHES NOMINAL IN |
| Material | COPPER ALLOY TUBES |
| Material | COPPER ALLOY TUBE SHEET |
| Material | COPPER ALLOY PLATES |
| 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 |
|---|---|
| 4M848A15 PIECE 3 PRIMARY | Fluid Handling Llc (USA) |
| 4M848B12 PRIMARY | Fluid Handling Llc (USA) |
| Reference | Meaning |
|---|---|
| 4M848B12 | 5/9 Secondary reference Itt Corporation Dba Itt Standard |
| 4M848A15 PIECE 3 | 5/9 Secondary reference Itt Corporation Dba Itt Standard |
| 4M848A15 | 5/9 Secondary reference Itt Corporation Dba Itt Standard |
| 4M848A15 | D/9 Drawing number reference only Fluid Handling Llc |
NSN 4420-01-221-8944 is a Core Assembly,fluid Cooler, manufactured by Fluid Handling Llc, classified under FSC 4420, Heat Exchangers and Steam Condensers. Status: active.
NSN 4420-01-221-8944 has 2 manufacturer part numbers on file: 4M848A15 PIECE 3 (Fluid Handling Llc), 4M848B12 (Fluid Handling Llc).
Key specifications for 4M848A15 PIECE 3: Heat Transfer Method: INDIRECT; Style Designator: STRAIGHT PLAIN TUBE, CYLINDRICAL; Material Document and Classification: MIL-C-15726 MIL SPEC SINGLE MATERIAL RESPONSE TUBE SHEET; Material Document and Classification: MIL-T-15005 MIL SPEC SINGLE MATERIAL RESPONSE TUBES. 12 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.