The Seat,valve, cataloged under National Stock Number 4820-01-121-2865, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Naval Sea Systems Command. Government technical data includes 8 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 5 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 4820-01-121-2865 |
| Primary Part Number | 803-5001004-X4XX-07 |
| Item Name | Seat,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Naval Sea Systems Command |
| Status | ACTIVE |
| Flange Seat to Disk End Height | 0.237 INCHES NOMINAL IN |
| Flange Diameter | 7.432 INCHES NOMINAL IN |
| Body Outside Diameter | 7.057 INCHES NOMINAL IN |
| Style Designator | PLAIN FLANGED |
| Body Inside Diameter | 5.755 INCHES MINIMUM AND 5.760 INCHES MAXIMUM IN |
| Under Flange Height | 0.383 INCHES MINIMUM AND 0.388 INCHES MAXIMUM IN |
| Material | PLASTIC POLYTETRAFLUOROETHYLENE OVERALL |
| Seating Surface Shape | FLAT |
| 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 |
|---|---|
| 803-5001004-X4XX-07 PRIMARY | Naval Sea Systems Command (USA) |
| 803-5001004-X3X1-07 PRIMARY | Naval Sea Systems Command (USA) |
| Reference | Meaning |
|---|---|
| 6000 | 5/9 Secondary reference Down East, Inc. |
| 803-5001004 | D/9 Drawing number reference only Naval Sea Systems Command |
| 5001004-X3X1-07 | C/1 Advisory reference — outside the item-of-supply concept Naval Sea Systems Command |
| 803-5001004-4XX | C/1 Advisory reference — outside the item-of-supply concept Naval Sea Systems Command |
| 803-5001004-X4X | C/1 Advisory reference — outside the item-of-supply concept Naval Sea Systems Command |
NSN 4820-01-121-2865 is a Seat,valve, manufactured by Naval Sea Systems Command, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-121-2865 has 2 manufacturer part numbers on file: 803-5001004-X4XX-07 (Naval Sea Systems Command), 803-5001004-X3X1-07 (Naval Sea Systems Command).
1 possible match (shared part number, not a government interchangeability claim): 4820-01-451-5645. Verify interchangeability with system specifications before substitution.
Key specifications for 803-5001004-X4XX-07: Flange Seat to Disk End Height: 0.237 INCHES NOMINAL IN; Flange Diameter: 7.432 INCHES NOMINAL IN; Body Outside Diameter: 7.057 INCHES NOMINAL IN; Style Designator: PLAIN FLANGED. 8 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.