The Seat,valve, cataloged under National Stock Number 4820-00-336-9277, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Ashcroft Inc Dba Heise. Government technical data includes 12 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 | 4820-00-336-9277 |
| Primary Part Number | 83894 |
| Item Name | Seat,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Ashcroft Inc Dba Heise |
| Status | ACTIVE |
| Flange Seat to Disk End Height | 0.625 INCHES NOMINAL IN |
| Flange Diameter | 3.000 INCHES NOMINAL IN |
| Thread Length | 0.438 INCHES NOMINAL SINGLE THREADED PORTION IN |
| Style Designator | THREADED FLANGED |
| Body Inside Diameter | 2.000 INCHES NOMINAL IN |
| Nominal Thread Size | 3.000 INCHES SINGLE THREADED PORTION IN |
| Under Flange Height | 1.250 INCHES NOMINAL IN |
| Thread Class | 2A SINGLE THREADED PORTION A |
| Thread Quantity Per Inch | 18 SINGLE THREADED PORTION |
| Material | STEEL OVERALL |
| 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 |
| Part Number | Manufacturer |
|---|---|
| 83894 PRIMARY | Ashcroft Inc Dba Heise (USA) |
NSN 4820-00-336-9277 is a Seat,valve, manufactured by Ashcroft Inc Dba Heise, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-00-336-9277 has 1 manufacturer part number on file: 83894 (Ashcroft Inc Dba Heise).
Key specifications for 83894: Flange Seat to Disk End Height: 0.625 INCHES NOMINAL IN; Flange Diameter: 3.000 INCHES NOMINAL IN; Thread Length: 0.438 INCHES NOMINAL SINGLE THREADED PORTION IN; Style Designator: THREADED FLANGED. 12 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.