The Core Assembly,fluid Cooler, cataloged under National Stock Number 4420-01-196-7638, 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 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4420-01-196-7638 |
| Primary Part Number | 4M536B6 |
| 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 |
| Core Diameter | 7.250 INCHES NOMINAL IN |
| Tube Attachment Method | EXPANDED BOTH ENDS |
| Core Length | 45.375 INCHES NOMINAL 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 |
|---|---|
| 4M536B6 PRIMARY | Fluid Handling Llc (USA) |
| 4M536A6 PIECE 3 | Fluid Handling Llc (USA) |
| Reference | Meaning |
|---|---|
| 4M536A6 | D/9 Drawing number reference only Itt Corporation Dba Itt Standard |
| 4M536B6 | 3/9 Design control — primary reference Itt Corporation Dba Itt Standard |
| 4M536A6 PIECE 3 | 5/9 Secondary reference Itt Corporation Dba Itt Standard |
NSN 4420-01-196-7638 is a Core Assembly,fluid Cooler, manufactured by Fluid Handling Llc, classified under FSC 4420, Heat Exchangers and Steam Condensers. Status: active.
NSN 4420-01-196-7638 has 2 manufacturer part numbers on file: 4M536B6 (Fluid Handling Llc), 4M536A6 PIECE 3 (Fluid Handling Llc).
Key specifications for 4M536B6: Heat Transfer Method: INDIRECT; Style Designator: STRAIGHT PLAIN TUBE, CYLINDRICAL; Core Diameter: 7.250 INCHES NOMINAL IN; Tube Attachment Method: EXPANDED BOTH ENDS. 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.