The Disk,valve, cataloged under National Stock Number 1650-00-421-7728, is classified within Federal Supply Class 1650 (Aircraft Hydraulic, Vacuum, and De-icing System Components) of the Aircraft Components and Accessories group. The manufacturer of record is Northrop Grumman Systems Corporation. Government technical data includes 8 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 1650-00-421-7728 |
| Primary Part Number | 1128HM40005-11 |
| Item Name | Disk,valve |
| FSC / FSG | 1650 / 16 — Aircraft Hydraulic, Vacuum, and De-icing System Components |
| Manufacturer | Northrop Grumman Systems Corporation |
| Status | ACTIVE |
| Shank Diameter | 0.309 INCHES MINIMUM AND 0.310 INCHES MAXIMUM IN |
| Flange Seat to Disk End Height | 0.938 INCHES NOMINAL IN |
| Outside Diameter | 0.437 INCHES NOMINAL IN |
| Style Designator | POPPET |
| Seat Angle | 45.0 DEGREES NOMINAL |
| Under Flange Height | 0.064 INCHES NOMINAL IN |
| Media for Which Designed | HYDRAULIC FLUID |
| Material | STEEL CORROSION RESISTING |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| 1128HM40005-11 PRIMARY | Northrop Grumman Systems Corporation (USA) |
| Reference | Meaning |
|---|---|
| 1128HM40005-11 | 5/9 Secondary reference Northrop Grumman Systems Corporation |
NSN 1650-00-421-7728 is a Disk,valve, manufactured by Northrop Grumman Systems Corporation, classified under FSC 1650, Aircraft Hydraulic, Vacuum, and De-icing System Components. Status: active.
NSN 1650-00-421-7728 has 1 manufacturer part number on file: 1128HM40005-11 (Northrop Grumman Systems Corporation).
Key specifications for 1128HM40005-11: Shank Diameter: 0.309 INCHES MINIMUM AND 0.310 INCHES MAXIMUM IN; Flange Seat to Disk End Height: 0.938 INCHES NOMINAL IN; Overall Height: 1.063 INCHES MINIMUM AND 1.068 INCHES MAXIMUM IN; Outside Diameter: 0.437 INCHES NOMINAL IN. 8 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.