The Seat,valve, cataloged under National Stock Number 4820-00-654-7428, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. Government technical data includes 9 specifications, cited from the U.S. Government catalog. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 5 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-00-654-7428 |
| Item Name | Seat,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Status | ACTIVE |
| Flange Seat to Disk End Height | 0.114 INCHES MINIMUM AND 0.117 INCHES MAXIMUM IN |
| Flange Diameter | 0.497 INCHES MINIMUM AND 0.498 INCHES MAXIMUM IN |
| FSC Application Data | VALVE,LINEAR,HYDRAULIC SYSTEM,AIRCRAFT |
| Body Outside Diameter | 0.387 INCHES MINIMUM AND 0.389 INCHES MAXIMUM IN |
| Style Designator | PLAIN FLANGED |
| Body Inside Diameter | 0.217 INCHES MINIMUM AND 0.218 INCHES MAXIMUM IN |
| Under Flange Height | 0.138 INCHES MINIMUM AND 0.144 INCHES MAXIMUM IN |
| Material | PLASTIC POLYAMIDE NYLON 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 |
|---|---|
| 11326 | 5/9 Secondary reference U.S. Government activity |
| 11326-10 | 3/2 Design control — primary reference U.S. Government activity |
| 4820PL0654512 | 6/9 Informative reference only Jednolity Indeks Materialowy - Uniform Material Index |
NSN 4820-00-654-7428 is a Seat,valve, classified under FSC 4820, Valves, Nonpowered. Status: active.
5 possible matches (shared part number, not a government interchangeability claim): 2840-01-087-1684, 4920-01-296-4961, 5998-01-384-4515. Verify interchangeability with system specifications before substitution.
Key specifications for 4820-00-654-7428: Flange Seat to Disk End Height: 0.114 INCHES MINIMUM AND 0.117 INCHES MAXIMUM IN; Flange Diameter: 0.497 INCHES MINIMUM AND 0.498 INCHES MAXIMUM IN; FSC Application Data: VALVE,LINEAR,HYDRAULIC SYSTEM,AIRCRAFT; Body Outside Diameter: 0.387 INCHES MINIMUM AND 0.389 INCHES MAXIMUM IN. 9 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.