The Gear Cluster, cataloged under National Stock Number 3020-00-412-5144, 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 Sikorsky Aircraft Corporation Dba Sikorsky Aircraft Corp. Government technical data includes 19 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 3020-00-412-5144 |
| Primary Part Number | 65351-11509-103 |
| Item Name | Gear Cluster |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Manufacturer | Sikorsky Aircraft Corporation Dba Sikorsky Aircraft Corp |
| Status | ACTIVE |
| Bore Nominal Diameter | 9.880 INCHES BOTH ENDS IN |
| Hub Nominal Diameter | 10.180 INCHES FIRST END IN |
| Hub Nominal Diameter | 10.500 INCHES BETWEEN FIRST AND SECOND GEAR IN |
| Backlash Designation | GRADE A ALL GEARS |
| Design Type | SPUR SECOND GEAR |
| Design Type | SPUR FIRST GEAR |
| Bore Style | PLAIN BOTH ENDS |
| Hardness Rating | 58.0 ROCKWELL C MINIMUM AND 64.0 ROCKWELL C MAXIMUM TEETH |
| Nominal Overall Length | 6.880 INCHES IN |
| Material Document and Classification | AMS 6265,NORMALIZED AND TEMPERED ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Hub Style Designator | PLAIN FIRST END |
| Hub Style Designator | 3 STEPS BETWEEN FIRST AND SECOND GEAR |
| Hub Nominal Length | 0.570 INCHES FIRST END IN |
| Hub Nominal Length | 2.370 INCHES BETWEEN FIRST AND SECOND GEAR IN |
| Nominal Outside Diameter | 11.697 INCHES SECOND GEAR IN |
| Nominal Outside Diameter | 11.820 INCHES FIRST GEAR IN |
| Surface Treatment | PHOSPHATE OVERALL |
| Material | STEEL COMP E9310 OVERALL |
| Construction | SOLID |
| 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 |
|---|---|
| 65351-11509-103 PRIMARY | Sikorsky Aircraft Corporation Dba Sikorsky Aircraft Corp (USA) |
| Reference | Meaning |
|---|---|
| 65351-11509-103 | 5/9 Secondary reference U.S. Government activity |
NSN 3020-00-412-5144 is a Gear Cluster, manufactured by Sikorsky Aircraft Corporation Dba Sikorsky Aircraft Corp, classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
NSN 3020-00-412-5144 has 1 manufacturer part number on file: 65351-11509-103 (Sikorsky Aircraft Corporation Dba Sikorsky Aircraft Corp).
Key specifications for 65351-11509-103: Bore Nominal Diameter: 9.880 INCHES BOTH ENDS IN; Hub Nominal Diameter: 10.180 INCHES FIRST END IN; Hub Nominal Diameter: 10.500 INCHES BETWEEN FIRST AND SECOND GEAR IN; Backlash Designation: GRADE A ALL GEARS. 19 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.