The Seat,valve, cataloged under National Stock Number 4820-00-104-8640, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. Government technical data includes 6 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 4820-00-104-8640 |
| Item Name | Seat,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Status | ACTIVE |
| Body Outside Diameter | 0.5420 INCHES MINIMUM AND 0.5430 INCHES MAXIMUM IN |
| Style Designator | PLAIN |
| Body Inside Diameter | 0.3745 INCHES MINIMUM AND 0.3755 INCHES MAXIMUM IN |
| Seat Radius | 0.5625 INCHES NOMINAL IN |
| Material | PLASTIC FLUORINATED ETHYLENE PROPYLENE OVERALL |
| 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 |
|---|---|
| 129861-0003 | 3/2 Design control — primary reference U.S. Government activity |
NSN 4820-00-104-8640 is a Seat,valve, classified under FSC 4820, Valves, Nonpowered. Status: active.
Key specifications for 4820-00-104-8640: Overall Height: 0.4620 INCHES MINIMUM AND 0.4635 INCHES MAXIMUM IN; Body Outside Diameter: 0.5420 INCHES MINIMUM AND 0.5430 INCHES MAXIMUM IN; Style Designator: PLAIN; Body Inside Diameter: 0.3745 INCHES MINIMUM AND 0.3755 INCHES MAXIMUM IN. 6 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.