The Seat,valve, cataloged under National Stock Number 4820-00-956-9447, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Spirax Sarco Inc Dba Spirax Sarco. Government technical data includes 13 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. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-00-956-9447 |
| Primary Part Number | 35453X11802 |
| Item Name | Seat,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Spirax Sarco Inc Dba Spirax Sarco |
| Status | ACTIVE |
| Flange Seat to Disk End Height | 0.159 INCHES NOMINAL IN |
| Flange Diameter | 1.245 INCHES NOMINAL IN |
| Thread Length | 0.250 INCHES NOMINAL SINGLE THREADED PORTION IN |
| Style Designator | THREADED FLANGED |
| Body Inside Diameter | 0.500 INCHES NOMINAL IN |
| Nominal Thread Size | 1.000 INCHES FIRST THREADED PORTION IN |
| Under Flange Height | 0.344 INCHES NOMINAL IN |
| Thread Class | 2A SINGLE THREADED PORTION A |
| Thread Quantity Per Inch | 14 SINGLE THREADED PORTION |
| Material | STEEL CORROSION RESISTING OVERALL |
| Seat Angle in Deg | 0.500 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 |
|---|---|
| 35453X11802 PRIMARY | Spirax Sarco Inc Dba Spirax Sarco (USA) |
NSN 4820-00-956-9447 is a Seat,valve, manufactured by Spirax Sarco Inc Dba Spirax Sarco, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-00-956-9447 has 1 manufacturer part number on file: 35453X11802 (Spirax Sarco Inc Dba Spirax Sarco).
Key specifications for 35453X11802: Flange Seat to Disk End Height: 0.159 INCHES NOMINAL IN; Flange Diameter: 1.245 INCHES NOMINAL IN; Thread Length: 0.250 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.