The Bonnet,fluid Cooler,industrial, cataloged under National Stock Number 4420-01-221-3663, is classified within Federal Supply Class 4420 (Heat Exchangers and Steam Condensers) of the Furnace, Steam, Drying, Nuclear Reactors group. Government technical data includes 1 specification, cited from the U.S. Government catalog. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government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 | 4420-01-221-3663 |
| Item Name | Bonnet,fluid Cooler,industrial |
| FSC / FSG | 4420 / 44 — Heat Exchangers and Steam Condensers |
| Status | ACTIVE |
| Material | IRON WROUGHT OVERALL |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Reference | Meaning |
|---|---|
| 5-036-04-026-002PC4 | 5/9 Secondary reference Itt Corporation Dba Itt Standard |
| 3-125-3-04-207-03 | 3/9 Design control — primary reference Itt Corporation Dba Itt Standard |
| 5-036-04-026-002 | D/9 Drawing number reference only Itt Corporation Dba Itt Standard |
NSN 4420-01-221-3663 is a Bonnet,fluid Cooler,industrial, classified under FSC 4420, Heat Exchangers and Steam Condensers. Status: active.
2 possible matches (shared part number, not a government interchangeability claim): 4420-01-221-3664, 4420-01-221-3710. Verify interchangeability with system specifications before substitution.
Key specifications for 4420-01-221-3663: End Item Identification: AMERICAN STANDARD COOLER ASSY,04026 BCPAMERICAN STANDARD COOLER ASSY,04026 BCP; Material: IRON WROUGHT OVERALL. 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.