The Core Assembly,fluid Cooler, cataloged under National Stock Number 4420-01-240-3135, 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 9 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4420-01-240-3135 |
| Primary Part Number | 4M1278B5 |
| 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 | FINNED PLATE, CYLINDRICAL |
| Material Document and Classification | MIL-T-15005 MIL SPEC SINGLE MATERIAL RESPONSE TUBES |
| Core Diameter | 15.750 INCHES NOMINAL IN |
| Tube Quantity | 163 |
| Tube Attachment Method | EXPANDED BOTH ENDS |
| Core Length | 77.875 INCHES NOMINAL IN |
| Tubing Outside Diameter | 0.625 INCHES NOMINAL LOCATION NOT OTHERWISE SPECIFIED IN |
| Material | COPPER AND NICKEL 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 |
|---|---|
| 4M1278B5 PRIMARY | Fluid Handling Llc (USA) |
| 4M1278A6 PC 3 | Fluid Handling Llc (USA) |
| Reference | Meaning |
|---|---|
| 4M1278B5 | 3/9 Design control — primary reference Itt Corporation Dba Itt Standard |
| 4M1278A6 PC 3 | 5/9 Secondary reference Itt Corporation Dba Itt Standard |
| 4M1278A6 | D/9 Drawing number reference only Itt Corporation Dba Itt Standard |
NSN 4420-01-240-3135 is a Core Assembly,fluid Cooler, manufactured by Fluid Handling Llc, classified under FSC 4420, Heat Exchangers and Steam Condensers. Status: active.
NSN 4420-01-240-3135 has 2 manufacturer part numbers on file: 4M1278B5 (Fluid Handling Llc), 4M1278A6 PC 3 (Fluid Handling Llc).
Key specifications for 4M1278B5: Heat Transfer Method: INDIRECT; Style Designator: FINNED PLATE, CYLINDRICAL; Material Document and Classification: MIL-T-15005 MIL SPEC SINGLE MATERIAL RESPONSE TUBES; Core Diameter: 15.750 INCHES NOMINAL IN. 9 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.