The Sheet,reverse Tube, cataloged under National Stock Number 4420-01-201-7557, 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1 specification, cited from the U.S. Government catalog. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 4420-01-201-7557 |
| Item Name | Sheet,reverse Tube |
| FSC / FSG | 4420 / 44 — Heat Exchangers and Steam Condensers |
| Status | ACTIVE |
| General Characteristics Item Description | COPPER NICKEL ALLOY |
| 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 |
|---|---|
| 1-JH-3417 | D/9 Drawing number reference only Westinghouse Electric Corp Power Generation-Generator Div |
| 1-JH-3420 PIECE 6 | 5/2 Secondary reference U.S. Government activity |
| 1-JH-3417 PIECE 19 | 3/9 Design control — primary reference Westinghouse Electric Corp Power Generation-Generator Div |
| 3204677 | D/9 Drawing number reference only U.S. Government activity |
NSN 4420-01-201-7557 is a Sheet,reverse Tube, classified under FSC 4420, Heat Exchangers and Steam Condensers. Status: active.
1 possible match (shared part number, not a government interchangeability claim): 5306-01-206-9734. Verify interchangeability with system specifications before substitution.
Key specifications for 4420-01-201-7557: General Characteristics Item Description: COPPER NICKEL ALLOY. 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.