The Seat,valve, cataloged under National Stock Number 4820-01-506-4084, 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 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-506-4084 |
| Primary Part Number | 803-4384536-3XXX-85 |
| Item Name | Seat,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Naval Sea Systems Command |
| Status | ACTIVE |
| Material Document and Classification | ASTM B164 ASSN STD SINGLE MATERIAL RESPONSE SEAT |
| Nominal Thread Size | 0.9375 INCHES SINGLE THREADED PORTION IN |
| Thread Class | 3A SINGLE THREADED PORTION A |
| Thread Quantity Per Inch | 24 SINGLE THREADED PORTION |
| Material | NICKEL ALLOY SEAT |
| Seat Angle in Deg | 45.000 NOMINAL |
| Thread Series Designator | UNS 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 |
|---|---|
| 803-4384536-3XXX-85 PRIMARY | Naval Sea Systems Command (USA) |
| Reference | Meaning |
|---|---|
| 4384536 | D/9 Drawing number reference only U.S. Government activity |
| 803-4384536-3XXX-85 | 5/9 Secondary reference U.S. Government activity |
NSN 4820-01-506-4084 is a Seat,valve, manufactured by Naval Sea Systems Command, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-506-4084 has 1 manufacturer part number on file: 803-4384536-3XXX-85 (Naval Sea Systems Command).
Key specifications for 803-4384536-3XXX-85: Material Document and Classification: ASTM B164 ASSN STD SINGLE MATERIAL RESPONSE SEAT; Nominal Thread Size: 0.9375 INCHES SINGLE THREADED PORTION IN; Part Name Assigned by Controlling Agency: SEAT RING (STOP & STOP CHECK); Thread Class: 3A SINGLE THREADED PORTION A. 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.