The Gear Cluster, cataloged under National Stock Number 3020-01-077-3474, 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 Caterpillar Inc Div Caterpillar Defense. Government technical data includes 23 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. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3020-01-077-3474 |
| Primary Part Number | 9N1973 |
| Item Name | Gear Cluster |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Manufacturer | Caterpillar Inc Div Caterpillar Defense |
| Status | ACTIVE |
| Hub Nominal Diameter | 2.000 INCHES BETWEEN THIRD AND FOURTH GEAR IN |
| Hub Nominal Diameter | 2.062 INCHES SECOND ENDUNABLE TO DECODE IN |
| Hub Nominal Diameter | 2.115 INCHES FIRST ENDUNABLE TO DECODE IN |
| Hub Nominal Diameter | 4.000 INCHES BETWEEN FIRST AND SECOND GEARUNABLE TO DECODE IN |
| Hub Nominal Diameter | 4.000 INCHES BETWEEN SECOND AND THIRD GEARUNABLE TO DECODE IN |
| Hub Nominal Diameter | UNABLE TO DECODE2.115 INCHES FIRST END2.115 INCHES FIRST END IN |
| Design Type | SPUR ALL GEARS |
| Nominal Overall Length | 10.412 INCHES IN |
| Hub Style Designator | 1 STEP BETWEEN FIRST AND SECOND GEAR |
| Hub Style Designator | 1 STEP BOTH ENDS |
| Hub Style Designator | 1 STEP BETWEEN SECOND AND THIRD GEAR |
| Hub Style Designator | PLAIN BETWEEN THIRD AND FOURTH GEAR |
| Hub Nominal Length | 0.875 INCHES SECOND END IN |
| Hub Nominal Length | 0.300 INCHES BETWEEN THIRD AND FOURTH GEAR IN |
| Hub Nominal Length | 1.141 INCHES FIRST END IN |
| Hub Nominal Length | 1.813 INCHES BETWEEN FIRST AND SECOND GEAR IN |
| Hub Nominal Length | 1.813 INCHES BETWEEN SECOND AND THIRD GEAR IN |
| Nominal Outside Diameter | 2.930 INCHES FOURTH GEAR IN |
| Nominal Outside Diameter | 3.800 INCHES THIRD GEAR IN |
| Nominal Outside Diameter | 5.650 INCHES SECOND GEAR IN |
| Nominal Outside Diameter | 6.500 INCHES FIRST GEAR IN |
| Material | STEEL 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 |
|---|---|
| 9N1973 PRIMARY | Caterpillar Inc Div Caterpillar Defense (USA) |
NSN 3020-01-077-3474 is a Gear Cluster, manufactured by Caterpillar Inc Div Caterpillar Defense, classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
NSN 3020-01-077-3474 has 1 manufacturer part number on file: 9N1973 (Caterpillar Inc Div Caterpillar Defense).
Key specifications for 9N1973: Hub Nominal Diameter: 2.000 INCHES BETWEEN THIRD AND FOURTH GEAR IN; Hub Nominal Diameter: 2.062 INCHES SECOND ENDUNABLE TO DECODE IN; Hub Nominal Diameter: 2.115 INCHES FIRST ENDUNABLE TO DECODE IN; Hub Nominal Diameter: 4.000 INCHES BETWEEN FIRST AND SECOND GEARUNABLE TO DECODE IN. 23 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.