The Gear Cluster, cataloged under National Stock Number 3020-01-121-8733, 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 Aimtron Systems, Llc. Government technical data includes 15 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3020-01-121-8733 |
| Primary Part Number | 503447 |
| Item Name | Gear Cluster |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Manufacturer | Aimtron Systems, Llc |
| Status | ACTIVE |
| Bore Nominal Diameter | 0.250 INCHES BOTH ENDS IN |
| Hub Nominal Diameter | 1.250 INCHES BETWEEN FIRST AND SECOND GEAR IN |
| Surface Treatment Document and Classification | MIL-A-8625,TYPE 1 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Design Type | SPUR SECOND GEAR |
| Design Type | SPUR FIRST GEAR |
| Bore Style | PLAIN BOTH ENDS |
| Nominal Overall Length | 0.437 INCHES IN |
| Material Document and Classification | QQ-A-225/6,T4 FED SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Hub Style Designator | PLAIN BETWEEN FIRST AND SECOND GEAR |
| Hub Nominal Length | 0.219 INCHES BETWEEN FIRST AND SECOND GEAR IN |
| Nominal Outside Diameter | 1.7083 INCHES SECOND GEAR IN |
| Nominal Outside Diameter | 3.1667 INCHES FIRST GEAR IN |
| Surface Treatment | ANODIZE OVERALL |
| Material | ALUMINUM ALLOY 2024 OVERALL |
| Construction | SOLID |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
NSN 3020-01-121-8733 is a Gear Cluster, manufactured by Aimtron Systems, Llc, classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
NSN 3020-01-121-8733 has 2 manufacturer part numbers on file: 503447 (Aimtron Systems, Llc), 1218733 (American Precision Gear Company Dba American Precision Gear Co Div Same).
1 possible match (shared part number, not a government interchangeability claim): 6685-01-231-2404. Verify interchangeability with system specifications before substitution.
Key specifications for 503447: Bore Nominal Diameter: 0.250 INCHES BOTH ENDS IN; Hub Nominal Diameter: 1.250 INCHES BETWEEN FIRST AND SECOND GEAR IN; Surface Treatment Document and Classification: MIL-A-8625,TYPE 1 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL; Design Type: SPUR SECOND GEAR. 15 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.