The Cooler,fluid,industrial, cataloged under National Stock Number 4420-01-239-0380, 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 Thermal Transfer Products Ltd. Government technical data includes 5 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. 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 | 4420-01-239-0380 |
| Primary Part Number | AO-5 |
| Item Name | Cooler,fluid,industrial |
| FSC / FSG | 4420 / 44 — Heat Exchangers and Steam Condensers |
| Manufacturer | Thermal Transfer Products Ltd |
| Status | ACTIVE |
| Heat Transfer Method | INDIRECT |
| Length | 14.810 INCHES NOMINAL IN |
| Height | 11.810 INCHES NOMINAL IN |
| Width | 17.560 INCHES NOMINAL IN |
| Material | STEEL HOUSING |
| 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 |
|---|---|
| AO-5 PRIMARY | Thermal Transfer Products Ltd (USA) |
NSN 4420-01-239-0380 is a Cooler,fluid,industrial, manufactured by Thermal Transfer Products Ltd, classified under FSC 4420, Heat Exchangers and Steam Condensers. Status: active.
NSN 4420-01-239-0380 has 1 manufacturer part number on file: AO-5 (Thermal Transfer Products Ltd).
1 possible match (shared part number, not a government interchangeability claim): 4810-01-332-6982. Verify interchangeability with system specifications before substitution.
Key specifications for AO-5: Heat Transfer Method: INDIRECT; Length: 14.810 INCHES NOMINAL IN; Height: 11.810 INCHES NOMINAL IN; Special Features: WEIGHT 50LBS;OPERATING PRESSURE 300 PSI;OPERATING TEMP 400 DEG F LBS. 5 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.