The Tube Nest Assembly, cataloged under National Stock Number 4420-01-375-2129, 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1 specification, cited from the U.S. Government catalog. 8 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4420-01-375-2129 |
| Item Name | Tube Nest Assembly |
| FSC / FSG | 4420 / 44 — Heat Exchangers and Steam Condensers |
| Status | ACTIVE |
| General Characteristics Item Description | 26 TUBES 0.125 INCH ID,0.500 INCHES OD,20.000 INCHES IN LENGTH EACH IN |
| 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 |
|---|---|
| 8987B | 5/9 Secondary reference U.S. Government activity |
| 250493AN11 | C/1 Advisory reference — outside the item-of-supply concept Curtiss-Wright Electro-Mechanical Corp Dba Steam & Air Solutions Div Curtiss-Wright Steam and Air Solutions |
| PL-12416418 SH 24 PC 2 | 5/9 Secondary reference Siemens Energy, Inc. Dba Dresser-Rand |
| 8987B | C/1 Advisory reference — outside the item-of-supply concept Curtiss-Wright Electro-Mechanical Corp Dba Steam & Air Solutions Div Curtiss-Wright Steam and Air Solutions |
| PL-12416418 SH 24 PC 2 | 5/9 Secondary reference U.S. Government activity |
| PL-12416418 SH 24 PC 2 | C/1 Advisory reference — outside the item-of-supply concept Curtiss-Wright Electro-Mechanical Corp Dba Steam & Air Solutions Div Curtiss-Wright Steam and Air Solutions |
| 8987B | 3/9 Design control — primary reference Siemens Energy, Inc. Dba Dresser-Rand |
| 250493AN11 | 5/9 Secondary reference Siemens Energy, Inc. Dba Dresser-Rand |
NSN 4420-01-375-2129 is a Tube Nest Assembly, classified under FSC 4420, Heat Exchangers and Steam Condensers. Status: active.
Key specifications for 4420-01-375-2129: General Characteristics Item Description: 26 TUBES 0.125 INCH ID,0.500 INCHES OD,20.000 INCHES IN LENGTH EACH IN. 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.