The Gear Cluster, cataloged under National Stock Number 3020-01-012-4174, is classified within Federal Supply Class 3020 (Gears, Pulleys, Sprockets, and Transmission Chain) of the Mechanical Power Transmission Equipment group. Government technical data includes 19 specifications, cited from the U.S. Government catalog. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3020-01-012-4174 |
| Item Name | Gear Cluster |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Status | ACTIVE |
| Hub Nominal Diameter | 0.094 INCHES BOTH ENDS IN |
| Hub Nominal Diameter | 0.116 INCHES BETWEEN FIRST AND SECOND GEAR IN |
| Backlash Designation | GRADE E ALL GEARS |
| Design Type | SPUR SECOND GEAR |
| Design Type | SPUR FIRST GEAR |
| Precision Classification | QUALITY NUMBER 11 ALL GEARS |
| Hardness Rating | 26.0 ROCKWELL C MINIMUM AND 32.0 ROCKWELL C MAXIMUM OVERALL |
| Nominal Overall Length | 0.871 INCHES IN |
| Material Document and Classification | QQ-S-764 FED SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Hub Style Designator | PLAIN BETWEEN FIRST AND SECOND GEAR |
| Hub Style Designator | 1 STEP BOTH ENDS |
| Hub Nominal Length | 0.116 INCHES FIRST END IN |
| Hub Nominal Length | 0.020 INCHES BETWEEN FIRST AND SECOND GEAR IN |
| Hub Nominal Length | 0.543 INCHES SECOND END IN |
| Nominal Outside Diameter | 0.1666 INCHES SECOND GEAR IN |
| Nominal Outside Diameter | 0.558 INCHES FIRST GEAR IN |
| Surface Treatment | PASSIVATE OVERALL |
| Material | STEEL COMP 416 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 |
| Reference | Meaning |
|---|---|
| 86559200601-602 | C/1 Advisory reference — outside the item-of-supply concept U.S. Government activity |
| 86559200601-602 PIECE 27 | 5/2 Secondary reference U.S. Government activity |
| 35559200060 | 3/2 Design control — primary reference U.S. Government activity |
NSN 3020-01-012-4174 is a Gear Cluster, classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
Key specifications for 3020-01-012-4174: Hub Nominal Diameter: 0.094 INCHES BOTH ENDS IN; Hub Nominal Diameter: 0.116 INCHES BETWEEN FIRST AND SECOND GEAR IN; Backlash Designation: GRADE E ALL GEARS; Design Type: SPUR SECOND GEAR. 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.