The Gear,helical, cataloged under National Stock Number 3020-00-679-8023, is classified within Federal Supply Class 3020 (Gears, Pulleys, Sprockets, and Transmission Chain) of the Mechanical Power Transmission Equipment group. The manufacturer of record is U S Army Tank Automotive Command Amsta-Im-Mm. Government technical data includes 29 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3020-00-679-8023 |
| Primary Part Number | 8756466 |
| Item Name | Gear,helical |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Manufacturer | U S Army Tank Automotive Command Amsta-Im-Mm |
| Status | ACTIVE |
| Bore Nominal Diameter | 1.305 INCHES BOTH ENDS IN |
| Helix Angle | 17.9386 DEGREES |
| Teeth Quantity | 80 |
| Second Step Nominal Diameter | 2.375 INCHES FIRST END IN |
| Body Style | WEBBED, SOLID |
| Counterbore Nominal Diameter | 1.620 INCHES FIRST END IN |
| Tooth Direction | RIGHT |
| Bore Style | INVOLUTE SPLINE BOTH ENDS |
| Nominal Distance Between Body Face and Protruding Hub End | 1.911 INCHES FIRST END IN |
| First Step Nominal Length | 0.688 INCHES FIRST END IN |
| Teeth Type | SINGLE HELIX |
| Hardness Rating | 58.0 ROCKWELL C MINIMUM AND 62.0 ROCKWELL C MAXIMUM TEETH |
| Nominal Overall Length | 4.031 INCHES IN |
| Second Step Nominal Length | 0.599 INCHES FIRST END IN |
| Style Designator | PROTRUDING HUBS |
| Material Document and Classification | 66 FED STD SINGLE MATERIAL RESPONSE OVERALL |
| Pitch Diameter | 7.0073 INCHES NOMINAL IN |
| Tooth Form | STUB |
| First Step Nominal Diameter | 2.001 INCHES FIRST END IN |
| Hub Style Designator | 2 STEPS FIRST END |
| Spline Quantity | 14 BOTH ENDS |
| End Nominal Length | 0.625 INCHES FIRST END IN |
| Nominal Outside Diameter | 7.145 INCHES IN |
| End Nominal Diameter | 1.875 INCHES FIRST END IN |
| Pressure Angle | 20.0000 DEGREES |
| Material | STEEL COMP 8615 OVERALL |
| Counterbore Nominal Depth | 1.119 INCHES FIRST END IN |
| Spline Pitch Diameter | 1.4000 INCHES NOMINAL BOTH ENDS IN |
| 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 |
| Part Number | Manufacturer |
|---|---|
| 8756466 PRIMARY | U S Army Tank Automotive Command Amsta-Im-Mm (USA) |
NSN 3020-00-679-8023 is a Gear,helical, manufactured by U S Army Tank Automotive Command Amsta-Im-Mm, classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
NSN 3020-00-679-8023 has 1 manufacturer part number on file: 8756466 (U S Army Tank Automotive Command Amsta-Im-Mm).
Key specifications for 8756466: Bore Nominal Diameter: 1.305 INCHES BOTH ENDS IN; Helix Angle: 17.9386 DEGREES; Teeth Quantity: 80; Second Step Nominal Diameter: 2.375 INCHES FIRST 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.