The Gear Cluster, cataloged under National Stock Number 3020-00-705-1657, is classified within Federal Supply Class 3020 (Gears, Pulleys, Sprockets, and Transmission Chain) of the Mechanical Power Transmission Equipment group. Government technical data includes 21 specifications, cited from the U.S. Government catalog. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3020-00-705-1657 |
| Item Name | Gear Cluster |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Status | ACTIVE |
| Bore Nominal Diameter | 0.250 INCHES BOTH ENDS IN |
| Hub Nominal Diameter | 0.813 INCHES FIRST END IN |
| Hub Nominal Diameter | 0.500 INCHES SECOND END IN |
| Hub Nominal Diameter | 1.000 INCHES BETWEEN FIRST AND SECOND GEAR IN |
| Design Type | SPUR SECOND GEAR |
| Design Type | SPUR FIRST GEAR |
| Bore Style | PLAIN BOTH ENDS |
| Nominal Overall Length | 1.031 INCHES IN |
| Hub Style Designator | PINNED SECOND END |
| Hub Style Designator | PLAIN BETWEEN FIRST AND SECOND GEAR |
| Hub Style Designator | PLAIN FIRST END |
| Hub Nominal Length | 0.016 INCHES FIRST END IN |
| Hub Nominal Length | 0.141 INCHES BETWEEN FIRST AND SECOND GEAR IN |
| Hub Nominal Length | 0.6093 INCHES SECOND END IN |
| Nominal Outside Diameter | 1.9792 INCHES SECOND GEAR IN |
| Nominal Outside Diameter | 2.7917 INCHES FIRST GEAR IN |
| Surface Treatment | PASSIVATE SHAFT/HUB |
| Material | STEEL CORROSION RESISTING SHAFT/HUB |
| Material | COPPER ALLOY ALL GEARS |
| Construction | ASSEMBLED |
| 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 |
| Reference | Meaning |
|---|---|
| B311-345 | 5/9 Secondary reference U.S. Government activity |
| B-311-345 | 3/9 Design control — primary reference Gyro Systems Co Inc |
NSN 3020-00-705-1657 is a Gear Cluster, classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
Key specifications for 3020-00-705-1657: Bore Nominal Diameter: 0.250 INCHES BOTH ENDS IN; Hub Nominal Diameter: 0.813 INCHES FIRST END IN; Hub Nominal Diameter: 0.500 INCHES SECOND END IN; Hub Nominal Diameter: 1.000 INCHES BETWEEN FIRST AND SECOND GEAR IN. 21 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.