The Gear Cluster, cataloged under National Stock Number 3020-00-129-8157, is classified within Federal Supply Class 3020 (Gears, Pulleys, Sprockets, and Transmission Chain) of the Mechanical Power Transmission Equipment group. Government technical data includes 30 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3020-00-129-8157 |
| Item Name | Gear Cluster |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Status | ACTIVE |
| Hub Nominal Diameter | 0.250 INCHES BOTH ENDSUNABLE TO DECODE IN |
| Hub Nominal Diameter | 0.438 INCHES BETWEEN FIRST AND SECOND GEARUNABLE TO DECODE IN |
| Hub Nominal Diameter | 0.438 INCHES BETWEEN SECOND AND THIRD GEARUNABLE TO DECODE IN |
| Hub Nominal Diameter | 0.500 INCHES BETWEEN THIRD AND FOURTH GEAR IN |
| Hub Nominal Diameter | 0.500 INCHES BETWEEN THIRD AND FOURTH GEARUNABLE TO DECODE IN |
| Design Type | SPUR ALL GEARSUNABLE TO DECODE |
| Nominal Overall Length | 2.531 INCHES IN |
| Hub Style Designator | PLAIN BETWEEN SECOND AND THIRD GEARUNABLE TO DECODE |
| Hub Style Designator | PLAIN BETWEEN FIRST AND SECOND GEARUNABLE TO DECODE |
| Hub Style Designator | 1 GROOVE FIRST ENDUNABLE TO DECODE |
| Hub Style Designator | 1 GROOVE SECOND ENDUNABLE TO DECODE |
| Hub Style Designator | PLAIN BETWEEN THIRD AND FOURTH GEARUNABLE TO DECODE |
| Hub Nominal Length | 0.094 INCHES BETWEEN THIRD AND FOURTH GEARUNABLE TO DECODE IN |
| Hub Nominal Length | 0.185 INCHES SECOND ENDUNABLE TO DECODE IN |
| Hub Nominal Length | 0.187 INCHES BETWEEN FIRST AND SECOND GEARUNABLE TO DECODE IN |
| Hub Nominal Length | 0.187 INCHES BETWEEN SECOND AND THIRD GEARUNABLE TO DECODE IN |
| Hub Nominal Length | 0.201 INCHES FIRST ENDUNABLE TO DECODE IN |
| Nominal Outside Diameter | 0.333 INCHES FOURTH GEARUNABLE TO DECODE IN |
| Nominal Outside Diameter | 0.6667 INCHES SECOND GEARUNABLE TO DECODE IN |
| Nominal Outside Diameter | 1.3958 INCHES FIRST GEARUNABLE TO DECODE IN |
| Nominal Outside Diameter | 1.4375 INCHES THIRD GEARUNABLE TO DECODE IN |
| Surface Treatment | PASSIVATE SHAFT/HUB |
| Surface Treatment | UNABLE TO DECODE |
| Surface Treatment | PASSIVATE SHAFT/HUBUNABLE TO DECODE |
| Surface Treatment | PASSIVATE FOURTH GEAR |
| Surface Treatment | PASSIVATE THIRD GEAR |
| Surface Treatment | PASSIVATE THIRD GEARUNABLE TO DECODE |
| Material | STEEL CORROSION RESISTING FIRST GEAR |
| Material | STEEL SECOND GEAR |
| Material | STEEL CORROSION RESISTING SHAFT/HUB |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL Q — CCL Item — Commerce Control List |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Reference | Meaning |
|---|---|
| 595892-2 | 3/2 Design control — primary reference U.S. Government activity |
NSN 3020-00-129-8157 is a Gear Cluster, classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
Key specifications for 3020-00-129-8157: Hub Nominal Diameter: 0.250 INCHES BOTH ENDSUNABLE TO DECODE IN; Hub Nominal Diameter: 0.438 INCHES BETWEEN FIRST AND SECOND GEARUNABLE TO DECODE IN; Hub Nominal Diameter: 0.438 INCHES BETWEEN SECOND AND THIRD GEARUNABLE TO DECODE IN; Hub Nominal Diameter: 0.500 INCHES BETWEEN THIRD AND FOURTH GEAR IN. 30 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 3020-00-129-8157 has DEMIL Code Q. 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.