The Gear,spur, cataloged under National Stock Number 3020-01-052-0489, is classified within Federal Supply Class 3020 (Gears, Pulleys, Sprockets, and Transmission Chain) of the Mechanical Power Transmission Equipment group. Government technical data includes 22 specifications, cited from the U.S. Government catalog. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3020-01-052-0489 |
| Item Name | Gear,spur |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Status | ACTIVE |
| Hub Spline Quantity | 56 FIRST END |
| Bore Nominal Diameter | 4.860 INCHES BOTH ENDS IN |
| Teeth Quantity | 48 |
| Body Style | PLAIN, SOLID |
| Counterbore Nominal Diameter | 5.160 INCHES COUNTERBORE FIRST END IN |
| Counterbore Nominal Diameter | 5.165 INCHES COUNTER BORE SECOND END IN |
| Bore Style | W/COUNTERBORE BOTH ENDS |
| Nominal Distance Between Body Face and Protruding Hub End | 1.425 INCHES FIRST END IN |
| Precision Classification | QUALITY NUMBER 12 |
| Hardness Rating | 33.0 ROCKWELL C MINIMUM AND 41.0 ROCKWELL C MAXIMUM HUB |
| Hardness Rating | 90.0 ROCKWELL SUPERFICIAL 15-N MINIMUM AND 91.5 ROCKWELL SUPERFICIAL 15-N MAXIMUM TEETH |
| Style Designator | PROTRUDING HUB |
| Pitch Diameter | 6.1571 INCHES NOMINAL IN |
| Tooth Form | SPECIAL |
| Hub Style Designator | EXTERNALLY SPLINED, INVOLUTE SPLINES FIRST END |
| Nominal Outside Diameter | 6.406 INCHES IN |
| Pressure Angle | 20.0000 DEGREES |
| Material | STEEL OVERALL |
| Hub Spline Pitch Diameter | 5.6000 INCHES NOMINAL FIRST END IN |
| Counterbore Nominal Depth | 0.600 INCHES COUNTERBORE FIRST END IN |
| Counterbore Nominal Depth | 1.811 INCHES COUNTER BORE SECOND END IN |
| Face Nominal Width | 2.060 INCHES IN |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL B — Remove Demilitarization Key Points |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Reference | Meaning |
|---|---|
| 214-040-030-003 | 3/2 Design control — primary reference U.S. Government activity |
| 214-040-030-3 | 5/9 Secondary reference U.S. Government activity |
NSN 3020-01-052-0489 is a Gear,spur, classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
Key specifications for 3020-01-052-0489: Hub Spline Quantity: 56 FIRST END; Bore Nominal Diameter: 4.860 INCHES BOTH ENDS IN; Teeth Quantity: 48; Body Style: PLAIN, SOLID. 22 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.
NSN 3020-01-052-0489 has DEMIL Code B. Demilitarization may be required before disposal or transfer to non-military entities.
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.