The Seat,valve, cataloged under National Stock Number 4820-00-021-1395, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. Government technical data includes 15 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-00-021-1395 |
| Item Name | Seat,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Status | ACTIVE |
| Flange Seat to Disk End Height | 0.187 INCHES MINIMUM AND 0.188 INCHES MAXIMUM IN |
| Flange Diameter | 1.811 INCHES MINIMUM AND 1.812 INCHES MAXIMUM IN |
| Thread Length | 0.437 INCHES MINIMUM FIRST THREADED PORTION IN |
| Thread Length | 0.438 INCHES MAXIMUM SECOND THREADED PORTION IN |
| Style Designator | THREADED FLANGED |
| Body Inside Diameter | 1.062 INCHES MINIMUM AND 1.063 INCHES MAXIMUM IN |
| Nominal Thread Size | 1.625 INCHES SINGLE THREADED PORTION IN |
| Under Flange Height | 0.437 INCHES MINIMUM AND 0.438 INCHES MAXIMUM IN |
| Thread Class | 2A SINGLE THREADED PORTION A |
| Thread Quantity Per Inch | 20 SINGLE THREADED PORTION |
| Material | COBALT ALLOY BODY |
| Material | STEEL FACE |
| Seat Angle in Deg | 60.000 NOMINAL |
| Thread Series Designator | UN 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 |
| Reference | Meaning |
|---|---|
| 10231-017-596 | 3/9 Design control — primary reference Dresser Industries Inc Masoneilan North American Opns Dresser Valve and Controls Div |
NSN 4820-00-021-1395 is a Seat,valve, classified under FSC 4820, Valves, Nonpowered. Status: active.
Key specifications for 4820-00-021-1395: Flange Seat to Disk End Height: 0.187 INCHES MINIMUM AND 0.188 INCHES MAXIMUM IN; Flange Diameter: 1.811 INCHES MINIMUM AND 1.812 INCHES MAXIMUM IN; Thread Length: 0.437 INCHES MINIMUM FIRST THREADED PORTION IN; Thread Length: 0.438 INCHES MAXIMUM SECOND THREADED PORTION IN. 15 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.