The Gear Cluster, cataloged under National Stock Number 3020-01-028-3313, 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 Naval Air Systems Command Managed Original Design Activity Not Material/parts Supplier. Government technical data includes 19 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. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3020-01-028-3313 |
| Primary Part Number | 537AS426 |
| Item Name | Gear Cluster |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Manufacturer | Naval Air Systems Command Managed Original Design Activity Not Material/parts Supplier |
| Status | ACTIVE |
| Bore Nominal Diameter | 0.662 INCHES BOTH ENDS IN |
| Hub Nominal Diameter | 0.850 INCHES SECOND END IN |
| Hub Nominal Diameter | 2.640 INCHES BETWEEN FIRST AND SECOND GEAR IN |
| Design Type | SPUR SECOND GEAR |
| Design Type | SPUR FIRST GEAR |
| Bore Style | INVOLUTE SPLINE BOTH ENDS |
| Hardness Rating | 30.0 ROCKWELL C NOMINAL AND 35.0 ROCKWELL C NOMINAL OVERALL |
| Nominal Overall Length | 0.935 INCHES IN |
| Material Document and Classification | QQ-S-624,COMP 4140 FED SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Hub Style Designator | PLAIN BETWEEN FIRST AND SECOND GEAR |
| Hub Style Designator | PLAIN SECOND END |
| Spline Quantity | 19 BOTH ENDS |
| Hub Nominal Length | 0.125 INCHES SECOND END IN |
| Hub Nominal Length | 0.1200 INCHES BETWEEN FIRST AND SECOND GEAR IN |
| Nominal Outside Diameter | 3.0790 INCHES SECOND GEAR IN |
| Nominal Outside Diameter | 3.7430 INCHES FIRST GEAR IN |
| Material | STEEL COMP 4140 OVERALL |
| Spline Pitch Diameter | 0.5938 INCHES NOMINAL BOTH ENDS 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 |
|---|---|
| 537AS426 PRIMARY | Naval Air Systems Command Managed Original Design Activity Not Material/parts Supplier (USA) |
NSN 3020-01-028-3313 is a Gear Cluster, manufactured by Naval Air Systems Command Managed Original Design Activity Not Material/parts Supplier, classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
NSN 3020-01-028-3313 has 1 manufacturer part number on file: 537AS426 (Naval Air Systems Command Managed Original Design Activity Not Material/parts Supplier).
Key specifications for 537AS426: Bore Nominal Diameter: 0.662 INCHES BOTH ENDS IN; Hub Nominal Diameter: 0.850 INCHES SECOND END IN; Hub Nominal Diameter: 2.640 INCHES BETWEEN FIRST AND SECOND GEAR IN; Design Type: SPUR SECOND GEAR. 19 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.