The Gear Cluster, cataloged under National Stock Number 3020-01-106-0839, 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 Ge Aviation Systems Llc Dba Ge Aviation Systems Llc. Government technical data includes 17 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3020-01-106-0839 |
| Primary Part Number | BYLB409 |
| Item Name | Gear Cluster |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Manufacturer | Ge Aviation Systems Llc Dba Ge Aviation Systems Llc |
| Status | ACTIVE |
| Hub Nominal Diameter | 0.312 INCHES BOTH ENDS IN |
| Surface Treatment Document and Classification | MIL-C-13924,CLASS I MIL SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Design Type | SPUR SECOND GEAR |
| Design Type | SPUR FIRST GEAR |
| Nominal Overall Length | 1.182 INCHES IN |
| Material Document and Classification | MIL-S-5626,COND C4 MIL SPEC SINGLE MATERIAL RESPONSE SECOND GEAR |
| Material Document and Classification | MIL-S-6049 MIL SPEC SINGLE MATERIAL RESPONSE FIRST GEAR |
| Hub Style Designator | 2 STEPS FIRST END |
| Hub Style Designator | 1 STEP SECOND END |
| Hub Nominal Length | 0.234 INCHES SECOND END IN |
| Hub Nominal Length | 0.417 INCHES FIRST END IN |
| Nominal Outside Diameter | 1.1250 INCHES SECOND GEAR IN |
| Nominal Outside Diameter | 2.1250 INCHES FIRST GEAR IN |
| Surface Treatment | OXIDE OVERALL |
| Material | STEEL COMP 4140 SECOND GEAR |
| Material | STEEL COMP 8740 FIRST GEAR |
| Construction | ASSEMBLED |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| BYLB409 PRIMARY | Ge Aviation Systems Llc Dba Ge Aviation Systems Llc (USA) |
NSN 3020-01-106-0839 is a Gear Cluster, manufactured by Ge Aviation Systems Llc Dba Ge Aviation Systems Llc, classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
NSN 3020-01-106-0839 has 1 manufacturer part number on file: BYLB409 (Ge Aviation Systems Llc Dba Ge Aviation Systems Llc).
Key specifications for BYLB409: Hub Nominal Diameter: 0.312 INCHES BOTH ENDS IN; Surface Treatment Document and Classification: MIL-C-13924,CLASS I MIL SPEC SINGLE TREATMENT RESPONSE OVERALL; Design Type: SPUR SECOND GEAR; Design Type: SPUR FIRST 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.
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.