The Seat,valve, cataloged under National Stock Number 4820-01-143-9463, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. Government technical data includes 13 specifications, cited from the U.S. Government catalog. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-143-9463 |
| Item Name | Seat,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Status | ACTIVE |
| Thread Length | 0.365 INCHES NOMINAL FIRST THREADED PORTION IN |
| Thread Length | 0.590 INCHES MINIMUM AND 0.870 INCHES MAXIMUM SECOND THREADED PORTION IN |
| Body Inside Diameter | 0.500 INCHES NOMINAL IN |
| Nominal Thread Size | 1.000 INCHES FIRST THREADED PORTION IN |
| Nominal Thread Size | 1.750 INCHES SECOND THREADED PORTION IN |
| Thread Class | 2A SECOND THREADED PORTION A |
| Thread Class | 2A FIRST THREADED PORTION A |
| Thread Quantity Per Inch | 12 SECOND THREADED PORTION |
| Thread Quantity Per Inch | 14 FIRST THREADED PORTION |
| Material | STEEL CORROSION RESISTING OVERALL |
| Thread Series Designator | UN SECOND THREADED PORTION |
| Thread Series Designator | UNS FIRST THREADED PORTION |
| 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 |
| Reference | Meaning |
|---|---|
| 072953CD | 3/2 Design control — primary reference U.S. Government activity |
| PL1865 PIECE 4 072953CD | 3/2 Design control — primary reference U.S. Government activity |
NSN 4820-01-143-9463 is a Seat,valve, classified under FSC 4820, Valves, Nonpowered. Status: active.
Key specifications for 4820-01-143-9463: Overall Height: 3.313 INCHES NOMINAL IN; Thread Length: 0.365 INCHES NOMINAL FIRST THREADED PORTION IN; Thread Length: 0.590 INCHES MINIMUM AND 0.870 INCHES MAXIMUM SECOND THREADED PORTION IN; Body Inside Diameter: 0.500 INCHES NOMINAL IN. 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.