The Gear,helical, cataloged under National Stock Number 3020-00-528-1579, 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22 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3020-00-528-1579 |
| Item Name | Gear,helical |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Status | ACTIVE |
| Keyway Nominal Width | 0.186 INCHES BOTH ENDS IN |
| Bore Nominal Diameter | 0.8754 INCHES BOTH ENDS IN |
| Helix Angle | 18.2000 DEGREES |
| Hub Nominal Diameter | 1.375 INCHES FIRST END IN |
| Nominal Distance Between Body Face and Recessed Hub End | 0.2525 INCHES FIRST END IN |
| Teeth Quantity | 129 |
| Body Style | WEBBED, OFFSET, WITH LIGHTENING HOLES |
| Tooth Direction | LEFT |
| Bore Style | W/ KEYWAY BOTH ENDS |
| Teeth Type | SINGLE HELIX |
| Hardness Rating | 22.0 ROCKWELL C MINIMUM AND 26.0 ROCKWELL C MAXIMUM HUB |
| Hardness Rating | 22.0 ROCKWELL C MINIMUM AND 26.0 ROCKWELL C MAXIMUM TEETH |
| Style Designator | RECESSED HUB |
| Material Document and Classification | 66 FED STD SINGLE MATERIAL RESPONSE AND AISI/SAE 4140 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Pitch Diameter | 4.8496 INCHES NOMINAL IN |
| Tooth Form | STANDARD |
| Hub Style Designator | PLAIN FIRST END |
| Nominal Outside Diameter | 4.9189 INCHES IN |
| Nominal Distance From Bore Center to Keyway Bottom | 0.5237 INCHES BOTH ENDS IN |
| Pressure Angle | 20.0000 DEGREES |
| Material | STEEL COMP 4140 OVERALL |
| Face Nominal Width | 1.125 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 |
|---|---|
| 1473C3 | 3/2 Design control — primary reference U.S. Government activity |
NSN 3020-00-528-1579 is a Gear,helical, classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
Key specifications for 3020-00-528-1579: Keyway Nominal Width: 0.186 INCHES BOTH ENDS IN; Bore Nominal Diameter: 0.8754 INCHES BOTH ENDS IN; Helix Angle: 18.2000 DEGREES; Hub Nominal Diameter: 1.375 INCHES FIRST END IN. 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.
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.