The Seat,valve, cataloged under National Stock Number 4820-00-993-4045, 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11 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-00-993-4045 |
| Item Name | Seat,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Status | ACTIVE |
| Flange Seat to Disk End Height | 0.250 INCHES NOMINAL IN |
| Flange Diameter | 1.126 INCHES NOMINAL IN |
| Body Outside Diameter | 1.078 INCHES MINIMUM AND 1.093 INCHES MAXIMUM IN |
| Hardness Rating | 183.0 BRINELL STANDARD NOMINAL BODY |
| Style Designator | PLAIN FLANGED |
| Material Document and Classification | MIL-S-18410,CLASS B MIL SPEC SINGLE MATERIAL RESPONSE BODY |
| Body Inside Diameter | 0.500 INCHES MINIMUM AND 0.501 INCHES MAXIMUM IN |
| Under Flange Height | 0.250 INCHES NOMINAL IN |
| Material | COBALT ALLOY FACE |
| Material | STEEL UNS K21590 BODY |
| Seating Surface Shape | RADIAL |
| 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 |
|---|---|
| 101B209YE1 | 3/9 Design control — primary reference General Electric Co Naval and Drive Turbine Systems Dept |
NSN 4820-00-993-4045 is a Seat,valve, classified under FSC 4820, Valves, Nonpowered. Status: active.
Key specifications for 4820-00-993-4045: Flange Seat to Disk End Height: 0.250 INCHES NOMINAL IN; Flange Diameter: 1.126 INCHES NOMINAL IN; Body Outside Diameter: 1.078 INCHES MINIMUM AND 1.093 INCHES MAXIMUM IN; Hardness Rating: 183.0 BRINELL STANDARD NOMINAL BODY. 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.