The Seat,valve, cataloged under National Stock Number 4820-01-433-8323, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. Government technical data includes 11 specifications, cited from the U.S. Government catalog. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 4820-01-433-8323 |
| Item Name | Seat,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Status | ACTIVE |
| Body Outside Diameter | 7.750 INCHES NOMINAL IN |
| Thread Length | 0.625 INCHES NOMINAL FIRST THREADED PORTION IN |
| Style Designator | PLAIN |
| Material Document and Classification | ASTM A494, GRADE -30C ASSN STD SINGLE MATERIAL RESPONSE SEAT |
| Body Inside Diameter | 6.875 INCHES NOMINAL IN |
| Nominal Thread Size | 7.750 INCHES SINGLE THREADED PORTION IN |
| Thread Class | 2A SINGLE THREADED PORTION A |
| Thread Quantity Per Inch | 12 SINGLE THREADED PORTION |
| Material | NICKEL ALLOY SEAT |
| Thread Series Designator | UNS SINGLE 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 |
|---|---|
| 1385541 | D/9 Drawing number reference only U.S. Government activity |
| 803-1385541-06X-26 | 3/2 Design control — primary reference U.S. Government activity |
NSN 4820-01-433-8323 is a Seat,valve, classified under FSC 4820, Valves, Nonpowered. Status: active.
1 possible match (shared part number, not a government interchangeability claim): 4820-01-459-6801. Verify interchangeability with system specifications before substitution.
Key specifications for 4820-01-433-8323: Overall Height: 1.750 INCHES NOMINAL IN; Body Outside Diameter: 7.750 INCHES NOMINAL IN; Thread Length: 0.625 INCHES NOMINAL FIRST THREADED PORTION IN; Style Designator: PLAIN. 11 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.