The Gear,spur, cataloged under National Stock Number 3020-00-445-0078, is classified within Federal Supply Class 3020 (Gears, Pulleys, Sprockets, and Transmission Chain) of the Mechanical Power Transmission Equipment group. Government technical data includes 29 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3020-00-445-0078 |
| Item Name | Gear,spur |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Status | ACTIVE |
| Bore Nominal Diameter | 0.125 INCHES BOTH ENDS IN |
| Hub Nominal Diameter | 0.187 INCHES SECOND END IN |
| Backlash Designation | GRADE D |
| Teeth Quantity | 76 |
| Second Step Nominal Diameter | 0.312 INCHES FIRST END IN |
| Body Style | PLAIN, SOLID |
| Bore Style | PLAIN BOTH ENDS |
| Nominal Distance Between Body Face and Protruding Hub End | 0.246 INCHES FIRST END IN |
| Nominal Distance Between Body Face and Protruding Hub End | 0.089 INCHES SECOND END IN |
| First Step Nominal Length | 0.035 INCHES FIRST END IN |
| Precision Classification | QUALITY NUMBER 10 OR QUALITY NUMBER 11 |
| Nominal Overall Length | 0.390 INCHES IN |
| Second Step Nominal Length | 0.035 INCHES FIRST END IN |
| Style Designator | PROTRUDING HUBS |
| Material Document and Classification | QQ-S-764 FED SPEC SINGLE MATERIAL RESPONSE HUB |
| Material Document and Classification | QQ-A-225/6 FED SPEC SINGLE MATERIAL RESPONSE TEETH |
| Pitch Diameter | 1.1865 INCHES MINIMUM AND 1.1875 INCHES MAXIMUM IN |
| Tooth Form | STANDARD |
| First Step Nominal Diameter | 0.251 INCHES FIRST END IN |
| Hub Style Designator | 2 STEPS FIRST END |
| Hub Style Designator | 1 GROOVE SECOND END |
| End Nominal Length | 0.176 INCHES FIRST END IN |
| Nominal Outside Diameter | 1.215 INCHES IN |
| Surface Treatment | PASSIVATE HUB |
| Nominal Distance From End to First Groove | 0.019 INCHES SECOND END IN |
| End Nominal Diameter | 0.187 INCHES FIRST END IN |
| Pressure Angle | 20.0000 DEGREES |
| Material | ALUMINUM ALLOY 2024 TEETH |
| Material | STEEL COMP 416 HUB |
| 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 |
|---|---|
| C310110109 | 3/2 Design control — primary reference U.S. Government activity |
NSN 3020-00-445-0078 is a Gear,spur, classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
Key specifications for 3020-00-445-0078: Bore Nominal Diameter: 0.125 INCHES BOTH ENDS IN; Hub Nominal Diameter: 0.187 INCHES SECOND END IN; Backlash Designation: GRADE D; Teeth Quantity: 76. 29 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.