The Core Assembly,fluid Cooler, cataloged under National Stock Number 4420-01-206-4289, 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 1 manufacturer part number 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4420-01-206-4289 |
| Primary Part Number | 166M1942B1 PIECE 8 |
| 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 "U" TUBE |
| Material Document and Classification | MIL-T-22214 MIL SPEC SINGLE MATERIAL RESPONSE TUBES |
| Tube Quantity | 21 |
| Tube Attachment Method | EXPANDED BOTH ENDS |
| Material Thickness | 0.049 INCHES NOMINAL IN |
| Core Length | 51.625 INCHES NOMINAL IN |
| Tubing Outside Diameter | 0.625 INCHES NOMINAL BOTH INLET AND OUTLET TUBE ENDS 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 |
|---|---|
| 166M1942B1 PIECE 8 PRIMARY | Fluid Handling Llc (USA) |
| Reference | Meaning |
|---|---|
| 166M1942B1 | 5/9 Secondary reference Itt Corporation Dba Itt Standard |
| 166M1942B1 | D/9 Drawing number reference only Fluid Handling Llc |
| 166M1942B1 PIECE 8 | 5/9 Secondary reference Itt Corporation Dba Itt Standard |
NSN 4420-01-206-4289 is a Core Assembly,fluid Cooler, manufactured by Fluid Handling Llc, classified under FSC 4420, Heat Exchangers and Steam Condensers. Status: active.
NSN 4420-01-206-4289 has 1 manufacturer part number on file: 166M1942B1 PIECE 8 (Fluid Handling Llc).
1 possible match (shared part number, not a government interchangeability claim): 4420-01-206-8414. Verify interchangeability with system specifications before substitution.
Key specifications for 166M1942B1 PIECE 8: Heat Transfer Method: INDIRECT; Style Designator: FINNED "U" TUBE; Material Document and Classification: MIL-T-22214 MIL SPEC SINGLE MATERIAL RESPONSE TUBES; Tube Quantity: 21. 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.