The Gear Cluster, cataloged under National Stock Number 3020-00-169-6989, 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 Simmonds Precision Products Inc. Government technical data includes 17 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 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 | 3020-00-169-6989 |
| Primary Part Number | A3151 |
| Item Name | Gear Cluster |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Manufacturer | Simmonds Precision Products Inc |
| Status | ACTIVE |
| Keyway Nominal Width | 0.102 INCHES SECOND END IN |
| Bore Nominal Diameter | 0.512 INCHES BOTH ENDS IN |
| Hub Nominal Diameter | 0.938 INCHES BETWEEN FIRST AND SECOND GEAR IN |
| Counterbore Nominal Diameter | 0.6320 INCHES FIRST END IN |
| Design Type | SPUR SECOND GEAR |
| Design Type | SPUR FIRST GEAR |
| Bore Style | W/COUNTERBORE FIRST END |
| Bore Style | W/ KEYWAY SECOND END |
| Nominal Overall Length | 0.516 INCHES IN |
| Hub Style Designator | PLAIN BETWEEN FIRST AND SECOND GEAR |
| Hub Nominal Length | 0.031 INCHES BETWEEN FIRST AND SECOND GEAR IN |
| Nominal Outside Diameter | 0.7910 INCHES SECOND GEAR IN |
| Nominal Outside Diameter | 1.4330 INCHES FIRST GEAR IN |
| Nominal Distance From Bore Center to Keyway Bottom | 0.332 INCHES SECOND END IN |
| Material | STEEL OVERALL |
| Counterbore Nominal Depth | 0.085 INCHES FIRST 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 |
| Part Number | Manufacturer |
|---|---|
| A3151 PRIMARY | Simmonds Precision Products Inc (USA) |
NSN 3020-00-169-6989 is a Gear Cluster, manufactured by Simmonds Precision Products Inc, classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
NSN 3020-00-169-6989 has 1 manufacturer part number on file: A3151 (Simmonds Precision Products Inc).
4 possible matches (shared part number, not a government interchangeability claim): 2920-00-371-5177, 5930-00-503-1815, 4820-01-168-2248. Verify interchangeability with system specifications before substitution.
Key specifications for A3151: Keyway Nominal Width: 0.102 INCHES SECOND END IN; Bore Nominal Diameter: 0.512 INCHES BOTH ENDS IN; Hub Nominal Diameter: 0.938 INCHES BETWEEN FIRST AND SECOND GEAR IN; Counterbore Nominal Diameter: 0.6320 INCHES FIRST END IN. 17 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.