The Gear Cluster, cataloged under National Stock Number 3020-00-775-0255, is classified within Federal Supply Class 3020 (Gears, Pulleys, Sprockets, and Transmission Chain) of the Mechanical Power Transmission Equipment group. The manufacturer of record is Us Army Aviation and Missile Command. Government technical data includes 22 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3020-00-775-0255 |
| Primary Part Number | 9174789 |
| Item Name | Gear Cluster |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Manufacturer | Us Army Aviation and Missile Command |
| Status | ACTIVE |
| Bore Nominal Diameter | 0.250 INCHES BOTH ENDS IN |
| Hub Nominal Diameter | 1.000 INCHES SECOND END IN |
| Hub Nominal Diameter | 1.000 INCHES BETWEEN FIRST AND SECOND GEAR IN |
| Hub Nominal Diameter | 0.749 INCHES FIRST END IN |
| Backlash Designation | GRADE C ALL GEARS |
| Design Type | SPUR SECOND GEAR |
| Design Type | SPUR FIRST GEAR |
| Bore Style | PLAIN BOTH ENDS |
| Precision Classification | QUALITY NUMBER 10 OR QUALITY NUMBER 11 ALL GEARS |
| Nominal Overall Length | 1.016 INCHES IN |
| Material Document and Classification | QQ-A-355,T4 FED SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Hub Style Designator | 2 STEPS FIRST END |
| Hub Style Designator | PLAIN BETWEEN FIRST AND SECOND GEAR |
| Hub Style Designator | PLAIN SECOND END |
| Hub Nominal Length | 0.0156 INCHES SECOND END IN |
| Hub Nominal Length | 0.078 INCHES BETWEEN FIRST AND SECOND GEAR IN |
| Hub Nominal Length | 0.6720 INCHES FIRST END IN |
| Nominal Outside Diameter | 1.686 INCHES SECOND GEAR IN |
| Nominal Outside Diameter | 2.250 INCHES FIRST GEAR IN |
| Material | ALUMINUM ALLOY 2024 OVERALL |
| Construction | SOLID |
| Attachment Method | MOUNTING HOLE |
| 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 |
|---|---|
| 9174789 PRIMARY | Us Army Aviation and Missile Command (USA) |
| Reference | Meaning |
|---|---|
| 9174789 | 5/1 Secondary reference Southern Gear & Machine Inc |
| A97-202-2 | 5/9 Secondary reference Arch Gear Works Inc |
NSN 3020-00-775-0255 is a Gear Cluster, manufactured by Us Army Aviation and Missile Command, classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
NSN 3020-00-775-0255 has 1 manufacturer part number on file: 9174789 (Us Army Aviation and Missile Command).
Key specifications for 9174789: Bore Nominal Diameter: 0.250 INCHES BOTH ENDS IN; Hub Nominal Diameter: 1.000 INCHES SECOND END IN; Hub Nominal Diameter: 1.000 INCHES BETWEEN FIRST AND SECOND GEAR IN; Hub Nominal Diameter: 0.749 INCHES FIRST END IN. 22 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.