The Seat,valve, cataloged under National Stock Number 4820-01-419-7120, 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 13 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-419-7120 |
| Primary Part Number | 803-6397434-X3XXXX-022 |
| Item Name | Seat,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Naval Sea Systems Command |
| Status | ACTIVE |
| Flange Seat to Disk End Height | 0.736 INCHES NOMINAL IN |
| Flange Diameter | 1.555 INCHES NOMINAL IN |
| Thread Length | 0.859 INCHES NOMINAL SINGLE THREADED PORTION IN |
| Style Designator | THREADED FLANGED |
| Body Inside Diameter | 0.815 INCHES NOMINAL IN |
| Nominal Thread Size | 1.375 INCHES SINGLE THREADED PORTION IN |
| Under Flange Height | 0.819 INCHES NOMINAL IN |
| Thread Class | 3A SINGLE THREADED PORTION A |
| Thread Quantity Per Inch | 20 SINGLE THREADED PORTION |
| Material | COBALT ALLOY SEAT |
| Seat Angle in Deg | 45.000 NOMINAL |
| Thread Series Designator | UN SINGLE THREADED PORTION |
| 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 |
|---|---|
| 803-6397434-X4XXXX-022 | Naval Sea Systems Command (USA) |
| 803-6397434-X3XXXX-022 PRIMARY | Naval Sea Systems Command (USA) |
| Reference | Meaning |
|---|---|
| 803-6397434-X31 | C/1 Advisory reference — outside the item-of-supply concept Naval Sea Systems Command |
| 6397434 | D/9 Drawing number reference only Naval Sea Systems Command |
| 803-6397434-X4X | C/1 Advisory reference — outside the item-of-supply concept Naval Sea Systems Command |
NSN 4820-01-419-7120 is a Seat,valve, manufactured by Naval Sea Systems Command, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-419-7120 has 2 manufacturer part numbers on file: 803-6397434-X4XXXX-022 (Naval Sea Systems Command), 803-6397434-X3XXXX-022 (Naval Sea Systems Command).
Key specifications for 803-6397434-X3XXXX-022: Flange Seat to Disk End Height: 0.736 INCHES NOMINAL IN; Flange Diameter: 1.555 INCHES NOMINAL IN; Thread Length: 0.859 INCHES NOMINAL SINGLE THREADED PORTION IN; Style Designator: THREADED FLANGED. 13 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.