The Gear Cluster, cataloged under National Stock Number 3020-00-705-1660, is classified within Federal Supply Class 3020 (Gears, Pulleys, Sprockets, and Transmission Chain) of the Mechanical Power Transmission Equipment group. Government technical data includes 21 specifications, cited from the U.S. Government catalog. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 3020-00-705-1660 |
| Item Name | Gear Cluster |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Status | ACTIVE |
| Bore Nominal Diameter | 0.219 INCHES BOTH ENDS IN |
| Hub Nominal Diameter | 0.875 INCHES BETWEEN FIRST AND SECOND GEAR IN |
| Design Type | SPUR SECOND GEAR |
| Design Type | SPUR FIRST GEAR |
| Bore Style | PLAIN BOTH ENDS |
| Precision Classification | QUALITY NUMBER 10 OR QUALITY NUMBER 11 ALL GEARS |
| Nominal Overall Length | 0.598 INCHES IN |
| Material Document and Classification | MIL-B-994 MIL SPEC SINGLE MATERIAL RESPONSE FIRST GEAR |
| Material Document and Classification | QQ-S-763,CLASS 304L FED SPEC SINGLE MATERIAL RESPONSE SECOND GEAR |
| Material Document and Classification | QQ-S-763,CLASS 304L FED SPEC SINGLE MATERIAL RESPONSE SHAFT/HUB |
| Hub Style Designator | 1 STEP BETWEEN FIRST AND SECOND GEAR |
| Hub Nominal Length | 0.282 INCHES BETWEEN FIRST AND SECOND GEAR IN |
| Nominal Outside Diameter | 1.042 INCHES SECOND GEAR IN |
| Nominal Outside Diameter | 5.0417 INCHES FIRST GEAR IN |
| Surface Treatment | PASSIVATE SECOND GEAR |
| Surface Treatment | PASSIVATE SHAFT/HUB |
| Material | COPPER ALLOY FIRST GEAR |
| Material | STEEL COMP 304L SECOND GEAR |
| Material | STEEL COMP 304L SHAFT/HUB |
| 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 |
| Reference | Meaning |
|---|---|
| B311-344 | 5/2 Secondary reference U.S. Government activity |
| 3307515 | 5/2 Secondary reference U.S. Government activity |
| B311-344 | 3/2 Design control — primary reference U.S. Government activity |
NSN 3020-00-705-1660 is a Gear Cluster, classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
1 possible match (shared part number, not a government interchangeability claim): 4330-01-048-2686. Verify interchangeability with system specifications before substitution.
Key specifications for 3020-00-705-1660: Bore Nominal Diameter: 0.219 INCHES BOTH ENDS IN; Hub Nominal Diameter: 0.875 INCHES BETWEEN FIRST AND SECOND GEAR IN; Design Type: SPUR SECOND GEAR; Design Type: SPUR FIRST GEAR. 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.
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.