The Gear Cluster, cataloged under National Stock Number 3020-01-075-6674, is classified within Federal Supply Class 3020 (Gears, Pulleys, Sprockets, and Transmission Chain) of the Mechanical Power Transmission Equipment group. Government technical data includes 16 specifications, cited from the U.S. Government catalog. 5 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 3 items share a part number with this NSN in the catalog (possible match — not a government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 | 3020-01-075-6674 |
| Item Name | Gear Cluster |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Status | ACTIVE |
| Bore Nominal Diameter | 2.531 INCHES BOTH ENDS IN |
| Hub Nominal Diameter | 3.250 INCHES FIRST END IN |
| Hub Nominal Diameter | 3.062 INCHES SECOND END IN |
| Design Type | SPUR ALL GEARS |
| Bore Style | PLAIN BOTH ENDS |
| Hardness Rating | 39.0 ROCKWELL C MINIMUM AND 42.0 ROCKWELL C MAXIMUM OVERALL |
| Nominal Overall Length | 2.590 INCHES IN |
| Material Document and Classification | 66A1ISI/SAE4340 FED STD SINGLE MATERIAL RESPONSE OVERALL |
| Hub Style Designator | PLAIN BOTH ENDS |
| Hub Nominal Length | 0.438 INCHES FIRST END IN |
| Hub Nominal Length | 0.402 INCHES SECOND END IN |
| Nominal Outside Diameter | 3.567 INCHES SECOND GEAR IN |
| Nominal Outside Diameter | 4.167 INCHES FIRST GEAR IN |
| Surface Treatment | OXIDE OVERALL |
| Material | STEEL COMP 4340 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 |
| Reference | Meaning |
|---|---|
| 2640-343X2 PIECE 3 | 5/2 Secondary reference U.S. Government activity |
| 2640-343X2 | D/9 Drawing number reference only U.S. Government activity |
| 2050583 | 3/2 Design control — primary reference U.S. Government activity |
| 845-2050583 | D/9 Drawing number reference only U.S. Government activity |
| 845-2050583 PIECE 3 | 5/2 Secondary reference U.S. Government activity |
NSN 3020-01-075-6674 is a Gear Cluster, classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
3 possible matches (shared part number, not a government interchangeability claim): 5340-01-239-6820, 2510-01-478-7229, 5340-01-478-7425. Verify interchangeability with system specifications before substitution.
Key specifications for 3020-01-075-6674: Bore Nominal Diameter: 2.531 INCHES BOTH ENDS IN; Hub Nominal Diameter: 3.250 INCHES FIRST END IN; Hub Nominal Diameter: 3.062 INCHES SECOND END IN; Design Type: SPUR ALL GEARS. 16 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.