The Seat,valve, cataloged under National Stock Number 4820-01-283-9673, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Huntington Ingalls Inc Div Newport News Shipbuilding. Government technical data includes 7 specifications, cited from the U.S. Government catalog. The record lists 7 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 7 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government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 | 4820-01-283-9673 |
| Primary Part Number | 2070-28 PIECE 29 |
| Item Name | Seat,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Huntington Ingalls Inc Div Newport News Shipbuilding |
| Status | ACTIVE |
| Body Outside Diameter | 0.499 INCHES NOMINAL IN |
| Style Designator | PLAIN |
| Body Inside Diameter | 0.388 INCHES NOMINAL IN |
| Seat Radius | 0.062 INCHES NOMINAL IN |
| Material | STEEL CORROSION RESISTING OVERALL |
| Seat Angle in Deg | 45.000 NOMINAL |
| Seating Surface Shape | ANGULAR |
| 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 |
|---|---|
| 6440215-8 | Naval Sea Systems Command (USA) |
| 4457259 PIECE 29 | Huntington Ingalls Inc Div Newport News Shipbuilding (USA) |
| 2070-28 PIECE 29 PRIMARY | Huntington Ingalls Inc Div Newport News Shipbuilding (USA) |
| 5489289-8 | Naval Sea Systems Command (USA) |
| 522 6640215 REV-ITEM 08SQ | Naval Sea Systems Command (USA) |
| 522-4457259 PIECE 29 | Huntington Ingalls Inc Div Newport News Shipbuilding (USA) |
| 522 5489289 REV-ITEM 08SQ | Naval Sea Systems Command (USA) |
| Reference | Meaning |
|---|---|
| 5489289 | D/9 Drawing number reference only Naval Sea Systems Command |
| 2070-28 | D/9 Drawing number reference only Huntington Ingalls Inc Div Newport News Shipbuilding |
| 5489289 ITEM 8 | C/1 Advisory reference — outside the item-of-supply concept Naval Sea Systems Command |
| H8832408 | 5/9 Secondary reference Naval Ship Engineering Center Philadelphia Division Submarine Antenna Quality Assurance |
| 4457259 | D/9 Drawing number reference only Huntington Ingalls Inc Div Newport News Shipbuilding |
| 522-4457259 | D/9 Drawing number reference only Huntington Ingalls Inc Div Newport News Shipbuilding |
| 6440215 | D/9 Drawing number reference only Naval Sea Systems Command |
NSN 4820-01-283-9673 is a Seat,valve, manufactured by Huntington Ingalls Inc Div Newport News Shipbuilding, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-283-9673 has 7 manufacturer part numbers on file: 6440215-8 (Naval Sea Systems Command), 4457259 PIECE 29 (Huntington Ingalls Inc Div Newport News Shipbuilding), 2070-28 PIECE 29 (Huntington Ingalls Inc Div Newport News Shipbuilding), 5489289-8 (Naval Sea Systems Command), 522 6640215 REV-ITEM 08SQ (Naval Sea Systems Command) and 2 more.
2 possible matches (shared part number, not a government interchangeability claim): 4820-01-316-6417, 5998-01-658-1871. Verify interchangeability with system specifications before substitution.
Key specifications for 2070-28 PIECE 29: Overall Height: 2.750 INCHES NOMINAL IN; Body Outside Diameter: 0.499 INCHES NOMINAL IN; Style Designator: PLAIN; Body Inside Diameter: 0.388 INCHES NOMINAL IN. 7 specifications are 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.