The Gear,helical, cataloged under National Stock Number 3020-01-286-7660, is classified within Federal Supply Class 3020 (Gears, Pulleys, Sprockets, and Transmission Chain) of the Mechanical Power Transmission Equipment group. Government technical data includes 20 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 3020-01-286-7660 |
| Item Name | Gear,helical |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Status | ACTIVE |
| Helix Angle | 21.8305 DEGREES |
| Hub Nominal Diameter | 0.210 INCHES FIRST END IN |
| Teeth Quantity | 17 |
| Surface Treatment Document and Classification | MIL-C-14550,CLASS 2 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Body Style | PLAIN, SOLID |
| Tooth Direction | LEFT |
| Nominal Distance Between Body Face and Protruding Hub End | 0.382 INCHES FIRST END IN |
| Precision Classification | QUALITY NUMBER 12 |
| Teeth Type | SINGLE HELIX |
| Hardness Rating | 37.0 ROCKWELL C MINIMUM AND 39.0 ROCKWELL C MAXIMUM OVERALL |
| Style Designator | PROTRUDING HUB |
| Material Document and Classification | MIL-S-5000 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Pitch Diameter | 0.2861 INCHES NOMINAL IN |
| Tooth Form | STUB |
| Hub Style Designator | PINNED FIRST END |
| Nominal Outside Diameter | 0.297 INCHES IN |
| Surface Treatment | COPPER OVERALL |
| Pressure Angle | 20.0000 DEGREES |
| Material | STEEL COMP 4340 OVERALL |
| Face Nominal Width | 0.280 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 |
|---|---|
| SM-D-772783 | 3/2 Design control — primary reference U.S. Government activity |
NSN 3020-01-286-7660 is a Gear,helical, classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
Key specifications for 3020-01-286-7660: Helix Angle: 21.8305 DEGREES; Hub Nominal Diameter: 0.210 INCHES FIRST END IN; Teeth Quantity: 17; Surface Treatment Document and Classification: MIL-C-14550,CLASS 2 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL. 20 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.