The Gear Cluster, cataloged under National Stock Number 3020-01-112-9975, is classified within Federal Supply Class 3020 (Gears, Pulleys, Sprockets, and Transmission Chain) of the Mechanical Power Transmission Equipment group. Government technical data includes 15 specifications, cited from the U.S. Government catalog. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 4 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3020-01-112-9975 |
| Item Name | Gear Cluster |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Status | ACTIVE |
| Bore Nominal Diameter | 0.188 INCHES SECOND END IN |
| Hub Nominal Diameter | 0.406 INCHES FIRST END IN |
| Counterbore Nominal Diameter | 0.2812 INCHES SECOND END IN |
| Design Type | BEVEL SECOND GEAR |
| Design Type | SPUR FIRST GEAR |
| Bore Style | W/COUNTERBORE SECOND END |
| Nominal Overall Length | 0.317 INCHES IN |
| Hub Style Designator | PLAIN FIRST END |
| Hub Nominal Length | 0.0870 INCHES FIRST END IN |
| Nominal Outside Diameter | 0.5400 INCHES SECOND GEAR IN |
| Nominal Outside Diameter | 0.9642 INCHES FIRST GEAR IN |
| Surface Treatment | OXIDE OVERALL |
| Material | STEEL OVERALL |
| Counterbore Nominal Depth | 0.016 INCHES SECOND END IN |
| 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 |
| Reference | Meaning |
|---|---|
| 72234-1 | 3/2 Design control — primary reference U.S. Government activity |
| 72234 | 5/2 Secondary reference U.S. Government activity |
NSN 3020-01-112-9975 is a Gear Cluster, classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
4 possible matches (shared part number, not a government interchangeability claim): 3110-01-281-3761, 4720-01-294-1606, 6150-01-469-8948. Verify interchangeability with system specifications before substitution.
Key specifications for 3020-01-112-9975: Bore Nominal Diameter: 0.188 INCHES SECOND END IN; Hub Nominal Diameter: 0.406 INCHES FIRST END IN; Counterbore Nominal Diameter: 0.2812 INCHES SECOND END IN; Design Type: BEVEL 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.