The Disk,valve, cataloged under National Stock Number 1650-01-253-5320, is classified within Federal Supply Class 1650 (Aircraft Hydraulic, Vacuum, and De-icing System Components) of the Aircraft Components and Accessories 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11 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 1650-01-253-5320 |
| Item Name | Disk,valve |
| FSC / FSG | 1650 / 16 — Aircraft Hydraulic, Vacuum, and De-icing System Components |
| Status | ACTIVE |
| Shank Diameter | 0.184 INCHES MINIMUM AND 0.190 INCHES MAXIMUM IN |
| Flange Seat to Disk End Height | 1.246 INCHES MINIMUM AND 1.256 INCHES MAXIMUM IN |
| Flange Diameter | 0.515 INCHES MINIMUM AND 0.520 INCHES MAXIMUM IN |
| FSC Application Data | AIRCRAFT HYDRAULIC SYSTEM |
| Style Designator | POPPET |
| Seat Angle | 30.0 DEGREES NOMINAL |
| Nominal Thread Size | 0.250 INCHES IN |
| Media for Which Designed | HYDRAULIC FLUID |
| Thread Class | 3A A |
| Material | STEEL CORROSION RESISTING |
| Thread Series Designator | UNF |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL Q — CCL Item — Commerce Control List |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Reference | Meaning |
|---|---|
| 351R250 | 3/2 Design control — primary reference U.S. Government activity |
NSN 1650-01-253-5320 is a Disk,valve, classified under FSC 1650, Aircraft Hydraulic, Vacuum, and De-icing System Components. Status: active.
Key specifications for 1650-01-253-5320: Shank Diameter: 0.184 INCHES MINIMUM AND 0.190 INCHES MAXIMUM IN; Flange Seat to Disk End Height: 1.246 INCHES MINIMUM AND 1.256 INCHES MAXIMUM IN; Flange Diameter: 0.515 INCHES MINIMUM AND 0.520 INCHES MAXIMUM IN; Overall Height: 1.345 INCHES NOMINAL IN. 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.
NSN 1650-01-253-5320 has DEMIL Code Q. Demilitarization may be required before disposal or transfer to non-military entities.
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.