The Disk,valve, cataloged under National Stock Number 1650-01-034-8553, 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 7 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 3 items share a part number with this NSN in the catalog (possible match — not a government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 | 1650-01-034-8553 |
| Item Name | Disk,valve |
| FSC / FSG | 1650 / 16 — Aircraft Hydraulic, Vacuum, and De-icing System Components |
| Status | ACTIVE |
| Flange Seat to Disk End Height | 0.489 INCHES NOMINAL IN |
| Outside Diameter | 0.423 INCHES MINIMUM AND 0.424 INCHES MAXIMUM IN |
| Material Document and Classification | QQ-S-763, CLASS 440C, COND A FED SPEC SINGLE MATERIAL RESPONSE |
| Seat Angle | 45.0 DEGREES NOMINAL |
| Under Flange Height | 0.086 INCHES NOMINAL IN |
| Media for Which Designed | HYDRAULIC FLUID |
| Material | STEEL COMP 440C |
| 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 |
|---|---|
| 31921 | 3/2 Design control — primary reference U.S. Government activity |
NSN 1650-01-034-8553 is a Disk,valve, classified under FSC 1650, Aircraft Hydraulic, Vacuum, and De-icing System Components. Status: active.
3 possible matches (shared part number, not a government interchangeability claim): 6515-01-446-9718, 6665-01-606-1927, 5998-01-682-4264. Verify interchangeability with system specifications before substitution.
Key specifications for 1650-01-034-8553: Flange Seat to Disk End Height: 0.489 INCHES NOMINAL IN; Overall Height: 0.565 INCHES MINIMUM AND 0.585 INCHES MAXIMUM IN; Outside Diameter: 0.423 INCHES MINIMUM AND 0.424 INCHES MAXIMUM IN; Material Document and Classification: QQ-S-763, CLASS 440C, COND A FED SPEC SINGLE MATERIAL RESPONSE. 7 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.