The Gear,spur, cataloged under National Stock Number 3020-01-052-0490, 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29 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 3020-01-052-0490 |
| Item Name | Gear,spur |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Status | ACTIVE |
| Bore Nominal Diameter | 0.650 INCHES BOTH ENDS IN |
| Teeth Quantity | 35 |
| Body Style | WEBBED, WITH LIGHTENING HOLES |
| Counterbore Nominal Diameter | 0.750 INCHES COUNTER BORE SECOND END IN |
| Bore Style | INVOLUTE SPLINE BOTH ENDS |
| Bore Style | W/COUNTERBORE SECOND END |
| Nominal Distance Between Body Face and Protruding Hub End | 0.583 INCHES SECOND END IN |
| Nominal Distance Between Body Face and Protruding Hub End | 1.152 INCHES FIRST END IN |
| First Step Nominal Length | 0.083 INCHES SECOND END IN |
| First Step Nominal Length | 0.552 INCHES FIRST END IN |
| Precision Classification | QUALITY NUMBER 12 |
| Hardness Rating | 52.0 ROCKWELL C MINIMUM AND 55.0 ROCKWELL C MAXIMUM OVERALL |
| Style Designator | PROTRUDING HUBS |
| Pitch Diameter | 3.5355 INCHES NOMINAL IN |
| Tooth Form | STANDARD |
| First Step Nominal Diameter | 0.984 INCHES FIRST END IN |
| First Step Nominal Diameter | 1.130 INCHES SECOND END IN |
| Hub Style Designator | 1 STEP BOTH ENDS |
| Spline Quantity | 12 BOTH ENDS |
| End Nominal Length | 0.500 INCHES SECOND END IN |
| End Nominal Length | 0.600 INCHES FIRST END IN |
| Nominal Outside Diameter | 3.745 INCHES IN |
| End Nominal Diameter | 0.875 INCHES FIRST END IN |
| End Nominal Diameter | 0.984 INCHES SECOND END IN |
| Pressure Angle | 20.0000 DEGREES |
| Material | STEEL OVERALL |
| Counterbore Nominal Depth | 0.985 INCHES COUNTER BORE SECOND END IN |
| Spline Pitch Diameter | 0.6000 INCHES NOMINAL BOTH ENDS IN |
| Face Nominal Width | 0.310 INCHES IN |
| 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 |
|---|---|
| 209-040-034-5 | 3/2 Design control — primary reference U.S. Government activity |
NSN 3020-01-052-0490 is a Gear,spur, classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
Key specifications for 3020-01-052-0490: Bore Nominal Diameter: 0.650 INCHES BOTH ENDS IN; Teeth Quantity: 35; Body Style: WEBBED, WITH LIGHTENING HOLES; Counterbore Nominal Diameter: 0.750 INCHES COUNTER BORE SECOND END IN. 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.