The Gear Cluster, cataloged under National Stock Number 3020-01-073-1157, is classified within Federal Supply Class 3020 (Gears, Pulleys, Sprockets, and Transmission Chain) of the Mechanical Power Transmission Equipment group. Government technical data includes 12 specifications, cited from the U.S. Government catalog. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 3020-01-073-1157 |
| Item Name | Gear Cluster |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Status | ACTIVE |
| Bore Nominal Diameter | 0.655 INCHES SECOND END IN |
| Counterbore Nominal Diameter | 0.8120 INCHES SECOND END IN |
| Design Type | SPUR SECOND GEAR |
| Design Type | SPUR FIRST GEAR |
| Bore Style | W/COUNTERBORE SECOND END |
| Nominal Overall Length | 0.810 INCHES IN |
| Nominal Outside Diameter | 1.6000 INCHES SECOND GEAR IN |
| Nominal Outside Diameter | 4.1000 INCHES FIRST GEAR IN |
| Surface Treatment | PHOSPHATE MANGANESE OVERALL |
| Material | STEEL OVERALL |
| Counterbore Nominal Depth | 0.750 INCHES SECOND END IN |
| Construction | WELDED |
| 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 |
|---|---|
| 124700 | 3/9 Design control — primary reference Trivent Engineering, Incorporated Div Trivent Engineering Inc. |
| 124700 | 5/9 Secondary reference Lockheed Martin Corp Electronics and Missiles Div |
| 124700 | 5/9 Secondary reference Tri-Aerotech Inc |
NSN 3020-01-073-1157 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): 5995-01-109-3649. Verify interchangeability with system specifications before substitution.
Key specifications for 3020-01-073-1157: Bore Nominal Diameter: 0.655 INCHES SECOND END IN; Counterbore Nominal Diameter: 0.8120 INCHES SECOND END IN; Design Type: SPUR SECOND GEAR; Design Type: SPUR FIRST GEAR. 12 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.