The Core Assembly,fluid Heater,indus, cataloged under National Stock Number 4420-01-377-6674, 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 Rix Industries. Government technical data includes 1 specification, 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4420-01-377-6674 |
| Primary Part Number | 71-135 |
| Item Name | Core Assembly,fluid Heater,indus |
| FSC / FSG | 4420 / 44 — Heat Exchangers and Steam Condensers |
| Manufacturer | Rix Industries |
| Status | ACTIVE |
| Heat Transfer Method | INDIRECT |
| 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 |
|---|---|
| 71-135 PRIMARY | Rix Industries (USA) |
| Reference | Meaning |
|---|---|
| D2297 NOTE 6 | 5/9 Secondary reference Rix Industries |
NSN 4420-01-377-6674 is a Core Assembly,fluid Heater,indus, manufactured by Rix Industries, classified under FSC 4420, Heat Exchangers and Steam Condensers. Status: active.
NSN 4420-01-377-6674 has 1 manufacturer part number on file: 71-135 (Rix Industries).
2 possible matches (shared part number, not a government interchangeability claim): 5345-01-513-8429, 4820-01-598-0883. Verify interchangeability with system specifications before substitution.
Key specifications for 71-135: Heat Transfer Method: INDIRECT. 1 specification is 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.