The Seat,valve, cataloged under National Stock Number 4820-00-059-4925, 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9 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-00-059-4925 |
| Item Name | Seat,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Status | ACTIVE |
| Flange Seat to Disk End Height | 0.047 INCHES MINIMUM AND 0.050 INCHES MAXIMUM IN |
| Flange Diameter | 0.602 INCHES MINIMUM AND 0.604 INCHES MAXIMUM IN |
| Body Outside Diameter | 0.525 INCHES MINIMUM AND 0.526 INCHES MAXIMUM IN |
| Style Designator | PLAIN FLANGED |
| Body Inside Diameter | 0.270 INCHES MINIMUM AND 0.272 INCHES MAXIMUM IN |
| Under Flange Height | 0.036 INCHES MINIMUM AND 0.037 INCHES MAXIMUM IN |
| Material | PLASTIC OVERALL |
| Seat Angle in Deg | 44.500 MINIMUM AND 45.500 MAXIMUM |
| 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 |
|---|---|
| 172042 | 3/2 Design control — primary reference U.S. Government activity |
NSN 4820-00-059-4925 is a Seat,valve, classified under FSC 4820, Valves, Nonpowered. Status: active.
1 possible match (shared part number, not a government interchangeability claim): 5950-01-254-6067. Verify interchangeability with system specifications before substitution.
Key specifications for 4820-00-059-4925: Flange Seat to Disk End Height: 0.047 INCHES MINIMUM AND 0.050 INCHES MAXIMUM IN; Flange Diameter: 0.602 INCHES MINIMUM AND 0.604 INCHES MAXIMUM IN; Body Outside Diameter: 0.525 INCHES MINIMUM AND 0.526 INCHES MAXIMUM IN; Style Designator: PLAIN FLANGED. 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.