The Cylinder Sleeve, cataloged under National Stock Number 1650-00-554-0371, 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 Ontic Engineering & Manufacturing, Inc Dba Ontic Us. Government technical data includes 14 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 1650-00-554-0371 |
| Primary Part Number | 1380719 |
| Item Name | Cylinder Sleeve |
| FSC / FSG | 1650 / 16 — Aircraft Hydraulic, Vacuum, and De-icing System Components |
| Manufacturer | Ontic Engineering & Manufacturing, Inc Dba Ontic Us |
| Status | ACTIVE |
| FSC Application Data | PUMP,HYDRAULIC,JET ENGINE,AIRCRAFT |
| Flange Thickness | 0.0860 INCHES NOMINAL IN |
| Design Type | WET |
| Body Outside Diameter | 0.9374 INCHES NOMINAL IN |
| Top Intake Port | NOT INCLUDED |
| Style Designator | DRY, FLANGED, RELIEVED |
| Top Inside Chamfer | NOT INCLUDED |
| Valve Recess | NOT INCLUDED |
| Intake Hole | NOT INCLUDED |
| Bottom Inside Chamfer | NOT INCLUDED |
| Bore Diameter | 0.7180 INCHES NOMINAL IN |
| Material | STEEL |
| Flange Outside Diameter | 0.9680 INCHES NOMINAL IN |
| Metallic Hardness Rating | 60.0 MINIMUM ROCKWELL C AND 65.0 MAXIMUM ROCKWELL C |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL B — Remove Demilitarization Key Points |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| 1380719 | Ontic Engineering & Manufacturing, Inc Dba Ontic Us (USA) |
| Reference | Meaning |
|---|---|
| 1380719 | 3/2 Design control — primary reference U.S. Government activity |
NSN 1650-00-554-0371 is a Cylinder Sleeve, manufactured by Ontic Engineering & Manufacturing, Inc Dba Ontic Us, classified under FSC 1650, Aircraft Hydraulic, Vacuum, and De-icing System Components. Status: active.
NSN 1650-00-554-0371 has 1 manufacturer part number on file: 1380719 (Ontic Engineering & Manufacturing, Inc Dba Ontic Us).
Key specifications for 1380719: FSC Application Data: PUMP,HYDRAULIC,JET ENGINE,AIRCRAFT; Flange Thickness: 0.0860 INCHES NOMINAL IN; Design Type: WET; Body Outside Diameter: 0.9374 INCHES NOMINAL IN. 14 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 1650-00-554-0371 has DEMIL Code B. 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.