The Heater,fluid,industrial, cataloged under National Stock Number 4420-01-074-1081, 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 Hayden Products, Llc Dba Hayden Industrial Products. 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 4420-01-074-1081 |
| Primary Part Number | 016621 |
| Item Name | Heater,fluid,industrial |
| FSC / FSG | 4420 / 44 — Heat Exchangers and Steam Condensers |
| Manufacturer | Hayden Products, Llc Dba Hayden Industrial Products |
| Status | ACTIVE |
| FSC Application Data | LIFT TRUCK MHU-83B/E |
| Heat Transfer Method | INDIRECT |
| Length | 14.000 INCHES NOMINAL IN |
| Style Designator | PLAIN U-TUBE |
| Height | 9.750 INCHES NOMINAL IN |
| Width | 3.000 INCHES NOMINAL IN |
| 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 |
|---|---|
| 016621 PRIMARY | Hayden Products, Llc Dba Hayden Industrial Products (USA) |
| 755448-1 PRIMARY | Fuel Systems Inc (USA) |
| Reference | Meaning |
|---|---|
| 20414X1-10 | 5/9 Secondary reference Hayden Inc |
| 755448-1 | 5/9 Secondary reference U.S. Government activity |
| 755448-1 | 7/2 Vendor item drawing reference Air Armament Center/ En |
NSN 4420-01-074-1081 is a Heater,fluid,industrial, manufactured by Hayden Products, Llc Dba Hayden Industrial Products, classified under FSC 4420, Heat Exchangers and Steam Condensers. Status: active.
NSN 4420-01-074-1081 has 2 manufacturer part numbers on file: 016621 (Hayden Products, Llc Dba Hayden Industrial Products), 755448-1 (Fuel Systems Inc).
1 possible match (shared part number, not a government interchangeability claim): 2530-01-110-5052. Verify interchangeability with system specifications before substitution.
Key specifications for 016621: FSC Application Data: LIFT TRUCK MHU-83B/E; Heat Transfer Method: INDIRECT; Length: 14.000 INCHES NOMINAL IN; Style Designator: PLAIN U-TUBE. 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.