The Gear Cluster, cataloged under National Stock Number 3020-00-570-6889, 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21 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3020-00-570-6889 |
| Item Name | Gear Cluster |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Status | ACTIVE |
| Bore Nominal Diameter | 0.125 INCHES BOTH ENDS IN |
| Design Type | SPUR SECOND GEAR |
| Design Type | SPUR FIRST GEAR |
| Bore Style | PLAIN BOTH ENDS |
| Hardness Rating | 28.0 ROCKWELL C MINIMUM AND 38.0 ROCKWELL C MAXIMUM TEETH |
| Nominal Overall Length | 0.435 INCHES IN |
| Material Document and Classification | QQ-S-763 FED SPEC SINGLE MATERIAL RESPONSE SHAFT/HUB |
| Material Document and Classification | QQ-A-355-CANCELED FED SPEC SINGLE MATERIAL RESPONSE FIRST GEAR |
| Material Document and Classification | QQ-S-763 FED SPEC SINGLE MATERIAL RESPONSE SECOND GEAR |
| Hub Style Designator | SPLIT FIRST END |
| Hub Nominal Length | 0.1770 INCHES FIRST END IN |
| Nominal Outside Diameter | 0.372 INCHES SECOND GEAR IN |
| Nominal Outside Diameter | 1.020 INCHES FIRST GEAR IN |
| Surface Treatment | PASSIVATE SECOND GEAR |
| Surface Treatment | PASSIVATE SHAFT/HUB |
| Surface Treatment | ANODIZE FIRST GEAR |
| Material | ALUMINUM ALLOY FIRST GEAR |
| Material | STEEL COMP 416 SHAFT/HUB |
| Material | STEEL COMP 416 SECOND GEAR |
| Construction | ASSEMBLED |
| Attachment Method | CLAMP |
| 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 |
|---|---|
| C310140228 | 3/2 Design control — primary reference U.S. Government activity |
NSN 3020-00-570-6889 is a Gear Cluster, classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
Key specifications for 3020-00-570-6889: Bore Nominal Diameter: 0.125 INCHES BOTH ENDS IN; Design Type: SPUR SECOND GEAR; Design Type: SPUR FIRST GEAR; Bore Style: PLAIN BOTH ENDS. 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.