The Filter,fluid, cataloged under National Stock Number 1650-01-018-4175, 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 Pti Technologies Inc.. Government technical data includes 12 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 1650-01-018-4175 |
| Primary Part Number | 7581989 |
| Item Name | Filter,fluid |
| FSC / FSG | 1650 / 16 — Aircraft Hydraulic, Vacuum, and De-icing System Components |
| Manufacturer | Pti Technologies Inc. |
| Status | ACTIVE |
| Filtration Rating in Microns | 25.0 ABSOLUTE |
| First Intake Nominal Thread Size | 0.562 INCHES IN |
| First Intake Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Design Type | REUSABLE |
| First Intake Thread Direction | RIGHT-HAND |
| First Intake Connection Type | THREADED INTERNAL TUBE HEAD |
| First Intake Thread Class | 3A A |
| Operating Pressure | 100.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM LOCATION NOT OTHERWISE SPECIFIED LBS |
| Filtering Element Quantity | 1 |
| Filtering System for Which Designed | FULL FLOW |
| First Discharge Connection Relationship to Intake Connection | IDENTICAL TO FIRST INTAKE CONNECTION |
| Mounting Type | INLET CONNECTION BASE |
| 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 |
|---|---|
| 7581989 | Pti Technologies Inc. (USA) |
| Reference | Meaning |
|---|---|
| 673497-101 | 3/2 Design control — primary reference U.S. Government activity |
NSN 1650-01-018-4175 is a Filter,fluid, manufactured by Pti Technologies Inc., classified under FSC 1650, Aircraft Hydraulic, Vacuum, and De-icing System Components. Status: active.
NSN 1650-01-018-4175 has 1 manufacturer part number on file: 7581989 (Pti Technologies Inc.).
Key specifications for 7581989: Filtration Rating in Microns: 25.0 ABSOLUTE; First Intake Nominal Thread Size: 0.562 INCHES IN; First Intake Thread Series Designator: UNIFIED NATIONAL JOINT FINE (UNJF); Design Type: REUSABLE. 12 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.