The Gear Cluster, cataloged under National Stock Number 3020-00-730-3978, is classified within Federal Supply Class 3020 (Gears, Pulleys, Sprockets, and Transmission Chain) of the Mechanical Power Transmission Equipment group. The manufacturer of record is Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier. Government technical data includes 21 specifications, cited from the U.S. Government catalog. The record lists 3 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3020-00-730-3978 |
| Primary Part Number | 57A14C92 |
| Item Name | Gear Cluster |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Manufacturer | Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier |
| Status | ACTIVE |
| Hub Nominal Diameter | 0.093 INCHES FIRST END IN |
| Hub Nominal Diameter | 0.055 INCHES SECOND END IN |
| Hub Nominal Diameter | 0.140 INCHES BETWEEN FIRST AND SECOND GEAR IN |
| Design Type | SPUR ALL GEARS |
| Nominal Overall Length | 0.640 INCHES IN |
| Material Document and Classification | QQ-B-613 COMP 1 FED SPEC SINGLE MATERIAL RESPONSE SECOND GEAR |
| Material Document and Classification | QQ-S-763,CLASS 7,TYPE A FED SPEC SINGLE MATERIAL RESPONSE FIRST GEAR |
| Material Document and Classification | QQ-S-763,CLASS 7,TYPE A FED SPEC SINGLE MATERIAL RESPONSE SHAFT/HUB |
| Hub Style Designator | PLAIN BETWEEN FIRST AND SECOND GEAR |
| Hub Style Designator | 1 STEP BOTH ENDS |
| Hub Nominal Length | 0.126 INCHES SECOND END IN |
| Hub Nominal Length | 0.078 INCHES FIRST END IN |
| Hub Nominal Length | 0.262 INCHES BETWEEN FIRST AND SECOND GEAR IN |
| Nominal Outside Diameter | 0.275 INCHES SECOND GEAR IN |
| Nominal Outside Diameter | 0.812 INCHES THIRD GEAR IN |
| Surface Treatment | PASSIVATE SHAFT/HUB |
| Surface Treatment | PASSIVATE FIRST GEAR |
| Material | STEEL COMP 303 FIRST GEAR |
| Material | STEEL COMP 303 SHAFT/HUB |
| Material | COPPER ALLOY SECOND GEAR |
| Construction | ASSEMBLED |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL B — Remove Demilitarization Key Points |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| 57A14C92 | Naval Air Systems Command Managed Original Design Activity Not Material/parts Supplier (USA) |
| 57A14C92 | Naval Air Warfare Center Aircraft Div (USA) |
| 57A14C92 PRIMARY | Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier (USA) |
| Reference | Meaning |
|---|---|
| 57A14C30 | D/9 Drawing number reference only Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier |
| 57A14C31 | D/9 Drawing number reference only Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier |
NSN 3020-00-730-3978 is a Gear Cluster, manufactured by Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier, classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
NSN 3020-00-730-3978 has 3 manufacturer part numbers on file: 57A14C92 (Naval Air Systems Command Managed Original Design Activity Not Material/parts Supplier), 57A14C92 (Naval Air Warfare Center Aircraft Div), 57A14C92 (Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier).
Key specifications for 57A14C92: Hub Nominal Diameter: 0.093 INCHES FIRST END IN; Hub Nominal Diameter: 0.055 INCHES SECOND END IN; Hub Nominal Diameter: 0.140 INCHES BETWEEN FIRST AND SECOND GEAR IN; Design Type: SPUR ALL GEARS. 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.
NSN 3020-00-730-3978 has DEMIL Code B. 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.