The Gear Cluster, cataloged under National Stock Number 3020-00-004-2785, is classified within Federal Supply Class 3020 (Gears, Pulleys, Sprockets, and Transmission Chain) of the Mechanical Power Transmission Equipment group. Government technical data includes 18 specifications, cited from the U.S. Government catalog. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3020-00-004-2785 |
| Item Name | Gear Cluster |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Status | ACTIVE |
| Bore Nominal Diameter | 0.6879 INCHES BOTH ENDS IN |
| Hub Nominal Diameter | 0.9379 INCHES FIRST END IN |
| Hub Nominal Diameter | 0.940 INCHES BETWEEN FIRST AND SECOND GEAR IN |
| Backlash Designation | GRADE D ALL GEARS |
| Surface Treatment Document and Classification | MIL-S-5002 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Design Type | BEVEL SECOND GEAR |
| Design Type | SPUR FIRST GEAR |
| Bore Style | PLAIN BOTH ENDS |
| Precision Classification | QUALITY NUMBER 14 ALL GEARS |
| Hardness Rating | 38.0 ROCKWELL C MINIMUM AND 45.0 ROCKWELL C MAXIMUM OVERALL |
| Hub Style Designator | PLAIN BETWEEN FIRST AND SECOND GEAR |
| Hub Style Designator | PLAIN FIRST END |
| Hub Nominal Length | 0.143 INCHES BETWEEN FIRST AND SECOND GEAR IN |
| Nominal Outside Diameter | 1.279 INCHES SECOND GEAR IN |
| Nominal Outside Diameter | 3.300 INCHES FIRST GEAR IN |
| Surface Treatment | PASSIVATE OVERALL |
| Material | STEEL COMP 630 OVERALL |
| 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 |
|---|---|
| A51M20033-1 | 5/9 Secondary reference Northrop Grumman Systems Corporation |
| A51M20033-1 | 3/9 Design control — primary reference Northrop Grumman Systems Corporation Dba Northrop Grumman Systems Corp Div Northrop Grumman Aeronautics Systems |
| A51M20033-1 | C/1 Advisory reference — outside the item-of-supply concept Northrop Grumman Systems Corporation |
| A51M20033 | D/9 Drawing number reference only Northrop Grumman Systems Corporation |
NSN 3020-00-004-2785 is a Gear Cluster, classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
Key specifications for 3020-00-004-2785: Bore Nominal Diameter: 0.6879 INCHES BOTH ENDS IN; Hub Nominal Diameter: 0.9379 INCHES FIRST END IN; Hub Nominal Diameter: 0.940 INCHES BETWEEN FIRST AND SECOND GEAR IN; Backlash Designation: GRADE D ALL GEARS. 18 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.