The Seat and Piston Assembly, cataloged under National Stock Number 4420-01-237-6341, 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 Newterra Corporation, Inc.. 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government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 | 4420-01-237-6341 |
| Primary Part Number | 143925 PIECE 2 |
| Item Name | Seat and Piston Assembly |
| FSC / FSG | 4420 / 44 — Heat Exchangers and Steam Condensers |
| Manufacturer | Newterra Corporation, Inc. |
| Status | ACTIVE |
| General Characteristics Item Description | NICKEL COPPER ALLOY |
| 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 |
|---|---|
| 143925 PIECE 2 PRIMARY | Newterra Corporation, Inc. (USA) |
| Reference | Meaning |
|---|---|
| 13925 PIECE 2 | 5/9 Secondary reference Newterra Corporation, Inc. |
| 143925 | D/9 Drawing number reference only Newterra Corporation, Inc. |
NSN 4420-01-237-6341 is a Seat and Piston Assembly, manufactured by Newterra Corporation, Inc., classified under FSC 4420, Heat Exchangers and Steam Condensers. Status: active.
NSN 4420-01-237-6341 has 1 manufacturer part number on file: 143925 PIECE 2 (Newterra Corporation, Inc.).
2 possible matches (shared part number, not a government interchangeability claim): 4420-01-237-6342, 4820-01-316-0153. Verify interchangeability with system specifications before substitution.
Key specifications for 143925 PIECE 2: General Characteristics Item Description: NICKEL COPPER 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.