The Gear Cluster, cataloged under National Stock Number 3020-00-021-6659, 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 Southern Gear & Machine Inc. Government technical data includes 26 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 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 | 3020-00-021-6659 |
| Primary Part Number | 501-150CM154-21 |
| Item Name | Gear Cluster |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Manufacturer | Southern Gear & Machine Inc |
| Status | ACTIVE |
| Bore Nominal Diameter | 0.250 INCHES BOTH ENDSUNABLE TO DECODE IN |
| Surface Treatment Document and Classification | UNABLE TO DECODE |
| Surface Treatment Document and Classification | MIL-F-14072,FINISH E300 MIL SPEC SINGLE TREATMENT RESPONSE SHAFT/HUB |
| Surface Treatment Document and Classification | MIL-F-14072,FINISH E300 MIL SPEC SINGLE TREATMENT RESPONSE FIRST GEAR |
| Surface Treatment Document and Classification | MIL-S-5002 MIL SPEC SINGLE TREATMENT RESPONSE SECOND GEAR |
| Design Type | SPUR SECOND GEARUNABLE TO DECODE |
| Design Type | SPUR FIRST GEARUNABLE TO DECODE |
| Bore Style | PLAIN BOTH ENDSUNABLE TO DECODE |
| Nominal Overall Length | 0.438 INCHES IN |
| Material Document and Classification | MIL-S-7720,COMP 303SE MIL SPEC SINGLE MATERIAL RESPONSE FIRST GEARUNABLE TO DECODE |
| Material Document and Classification | MIL-S-7720,COMP 303SE MIL SPEC SINGLE MATERIAL RESPONSE SHAFT/HUBUNABLE TO DECODE |
| Material Document and Classification | QQ-A-225/6,ALLOY 2024,T4 FED SPEC SINGLE MATERIAL RESPONSE SECOND GEARUNABLE TO DECODE |
| Nominal Thread Size | 0.112 INCHES BOTH ENDSUNABLE TO DECODE IN |
| Hub Nominal Length | 0.126 INCHES BETWEEN FIRST AND SECOND GEARUNABLE TO DECODE IN |
| Nominal Outside Diameter | 0.477 INCHES FOURTH GEARUNABLE TO DECODE IN |
| Nominal Outside Diameter | 1.582 INCHES FIFTH GEARUNABLE TO DECODE IN |
| Surface Treatment | PASSIVATE SECOND GEARUNABLE TO DECODE |
| Surface Treatment | PASSIVATE SHAFT/HUBUNABLE TO DECODE |
| Surface Treatment | PASSIVATE FIRST GEARUNABLE TO DECODE |
| Material | ALUMINUM ALLOY 2024 SECOND GEARUNABLE TO DECODE |
| Material | STEEL COMP 303SE FIRST GEARUNABLE TO DECODE |
| Material | STEEL COMP 303SE SHAFT/HUBUNABLE TO DECODE |
| Thread Series Designator | UNIFIED NATIONAL COARSE (UNC) BOTH ENDS |
| Thread Series Designator | UNIFIED NATIONAL COARSE (UNC) BOTH ENDSUNABLE TO DECODE |
| Construction | ASSEMBLED |
| Attachment Method | MOUNTING HOLE |
| 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 |
|---|---|
| 10131630 | Us Army Aviation and Missile Command (USA) |
| 501-150CM154-21 PRIMARY | Southern Gear & Machine Inc (USA) |
NSN 3020-00-021-6659 is a Gear Cluster, manufactured by Southern Gear & Machine Inc, classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
NSN 3020-00-021-6659 has 2 manufacturer part numbers on file: 10131630 (Us Army Aviation and Missile Command), 501-150CM154-21 (Southern Gear & Machine Inc).
1 possible match (shared part number, not a government interchangeability claim): 5935-01-275-8221. Verify interchangeability with system specifications before substitution.
Key specifications for 501-150CM154-21: Bore Nominal Diameter: 0.250 INCHES BOTH ENDSUNABLE TO DECODE IN; Surface Treatment Document and Classification: UNABLE TO DECODE; Surface Treatment Document and Classification: MIL-F-14072,FINISH E300 MIL SPEC SINGLE TREATMENT RESPONSE SHAFT/HUB; Surface Treatment Document and Classification: MIL-F-14072,FINISH E300 MIL SPEC SINGLE TREATMENT RESPONSE FIRST GEAR. 26 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.