The Gear Cluster, cataloged under National Stock Number 3020-01-189-9478, is classified within Federal Supply Class 3020 (Gears, Pulleys, Sprockets, and Transmission Chain) of the Mechanical Power Transmission Equipment group. Government technical data includes 17 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 3020-01-189-9478 |
| Item Name | Gear Cluster |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Status | ACTIVE |
| Bore Nominal Diameter | 1.299 INCHES BOTH ENDS IN |
| Hub Nominal Diameter | 1.5800 INCHES BETWEEN FIRST AND SECOND GEAR IN |
| Surface Treatment Document and Classification | QQ-P-416 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Design Type | SPUR SECOND GEAR |
| Design Type | SPUR FIRST GEAR |
| Bore Style | PLAIN BOTH ENDS |
| Precision Classification | QUALITY NUMBER 8 FIRST GEAR |
| Hardness Rating | 38.0 ROCKWELL C NOMINAL OVERALL |
| Nominal Overall Length | 1.956 INCHES IN |
| Hub Style Designator | PLAIN FIRST END |
| Hub Nominal Length | 0.168 INCHES BETWEEN FIRST AND SECOND GEAR IN |
| Hub Nominal Length | 0.2130 INCHES FIRST END IN |
| Nominal Outside Diameter | 2.2450 INCHES SECOND GEAR IN |
| Nominal Outside Diameter | 5.3300 INCHES FIRST GEAR IN |
| Surface Treatment | CADMIUM OVERALL |
| Material | STEEL COMP 9310H OVERALL |
| Construction | ASSEMBLED |
| 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 |
|---|---|
| 42357-45 | 3/2 Design control — primary reference U.S. Government activity |
NSN 3020-01-189-9478 is a Gear Cluster, classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
Key specifications for 3020-01-189-9478: Bore Nominal Diameter: 1.299 INCHES BOTH ENDS IN; Hub Nominal Diameter: 1.5800 INCHES BETWEEN FIRST AND SECOND GEAR IN; Surface Treatment Document and Classification: QQ-P-416 FED SPEC SINGLE TREATMENT RESPONSE OVERALL; Design Type: SPUR SECOND GEAR. 17 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 3020-01-189-9478 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.