The Seat,valve, cataloged under National Stock Number 4820-01-203-4789, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. Government technical data includes 5 specifications, cited from the U.S. Government catalog. 5 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-203-4789 |
| Item Name | Seat,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Status | ACTIVE |
| Body Outside Diameter | 1.310 INCHES MINIMUM AND 1.313 INCHES MAXIMUM IN |
| Style Designator | PLAIN |
| Body Inside Diameter | 0.960 INCHES NOMINAL IN |
| Material | STEEL OVERALL |
| 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 |
| Reference | Meaning |
|---|---|
| 845-1889552 PIECE 4 | 5/2 Secondary reference U.S. Government activity |
| 845-1889552 | D/9 Drawing number reference only U.S. Government activity |
| 2620-920X3 PIECE 4 | 3/2 Design control — primary reference U.S. Government activity |
| 2620-920X3 PIECE 4 | 5/9 Secondary reference U.S. Government activity |
| 2620-920X3 | D/9 Drawing number reference only U.S. Government activity |
NSN 4820-01-203-4789 is a Seat,valve, classified under FSC 4820, Valves, Nonpowered. Status: active.
Key specifications for 4820-01-203-4789: Overall Height: 0.655 INCHES MINIMUM AND 0.658 INCHES MAXIMUM IN; Body Outside Diameter: 1.310 INCHES MINIMUM AND 1.313 INCHES MAXIMUM IN; Style Designator: PLAIN; Body Inside Diameter: 0.960 INCHES NOMINAL IN. 5 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.