The Core Assembly,fluid Cooler, cataloged under National Stock Number 4420-01-235-3405, 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 4420-01-235-3405 |
| Primary Part Number | 166M642B3 |
| 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 | PLAIN "U" TUBE |
| 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 |
| Tube Quantity | 42 |
| Core Length | 44.500 INCHES NOMINAL IN |
| Tubing Outside Diameter | 0.375 INCHES NOMINAL BOTH INLET AND OUTLET TUBE ENDS IN |
| Material | COPPER AND NICKEL ALLOY TUBE SHEET |
| 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 |
|---|---|
| 166M642A3 PC3 | Fluid Handling Llc (USA) |
| 166M642B3 PRIMARY | Fluid Handling Llc (USA) |
| Reference | Meaning |
|---|---|
| 166M642A3 | D/9 Drawing number reference only Itt Corporation Dba Itt Standard |
| 166M642A3 PC3 | 5/9 Secondary reference Itt Corporation Dba Itt Standard |
| 166M642B3 | 3/9 Design control — primary reference Itt Corporation Dba Itt Standard |
NSN 4420-01-235-3405 is a Core Assembly,fluid Cooler, manufactured by Fluid Handling Llc, classified under FSC 4420, Heat Exchangers and Steam Condensers. Status: active.
NSN 4420-01-235-3405 has 2 manufacturer part numbers on file: 166M642A3 PC3 (Fluid Handling Llc), 166M642B3 (Fluid Handling Llc).
Key specifications for 166M642B3: Heat Transfer Method: INDIRECT; Style Designator: PLAIN "U" TUBE; 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. 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.