The Gear Cluster, cataloged under National Stock Number 3020-01-009-7681, 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 | 3020-01-009-7681 |
| Primary Part Number | BYLH81 |
| 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 |
| Bore Nominal Diameter | 0.096 INCHES BOTH ENDS IN |
| Hub Nominal Diameter | 0.163 INCHES FIRST END IN |
| Surface Treatment Document and Classification | MIL-C-13924,CLASS 2 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Design Type | SPUR SECOND GEAR |
| Design Type | SPUR FIRST GEAR |
| Bore Style | PLAIN BOTH ENDS |
| Nominal Overall Length | 0.203 INCHES IN |
| Material Document and Classification | 66 FED STD SINGLE MATERIAL RESPONSE FIRST GEAR |
| Material Document and Classification | QQ-S-628,CLASS B FED SPEC SINGLE MATERIAL RESPONSE SECOND GEAR |
| Hub Style Designator | PLAIN FIRST END |
| Hub Nominal Length | 0.016 INCHES FIRST END IN |
| Nominal Outside Diameter | 0.250 INCHES SECOND GEAR IN |
| Nominal Outside Diameter | 0.4375 INCHES FIRST GEAR IN |
| Surface Treatment | OXIDE OVERALL |
| Material | STEEL COMP 1050 FIRST GEAR |
| Material | STEEL COMP O6 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 |
|---|---|
| BYLH81 PRIMARY | Ge Aviation Systems Llc Dba Ge Aviation Systems Llc (USA) |
NSN 3020-01-009-7681 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 3020-01-009-7681 has 1 manufacturer part number on file: BYLH81 (Ge Aviation Systems Llc Dba Ge Aviation Systems Llc).
Key specifications for BYLH81: Bore Nominal Diameter: 0.096 INCHES BOTH ENDS IN; Hub Nominal Diameter: 0.163 INCHES FIRST END IN; Surface Treatment Document and Classification: MIL-C-13924,CLASS 2 MIL 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 3020-01-009-7681 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.