The Gear,helical, cataloged under National Stock Number 3020-00-679-8020, 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 30 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3020-00-679-8020 |
| Primary Part Number | 8756469 |
| 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 |
| Hub Nominal Diameter | 1.561 INCHES FIRST END IN |
| Teeth Quantity | 79 |
| Second Step Nominal Diameter | 3.000 INCHES SECOND END IN |
| Body Style | WEBBED, SOLID |
| Counterbore Nominal Diameter | 1.561 INCHES FIRST END IN |
| Tooth Direction | LEFT |
| Bore Style | INVOLUTE SPLINE BOTH ENDS |
| Nominal Distance Between Body Face and Protruding Hub End | 1.450 INCHES FIRST END IN |
| First Step Nominal Length | 0.468 INCHES FIRST END IN |
| Teeth Type | SINGLE HELIX |
| Hardness Rating | 28.0 ROCKWELL C MINIMUM AND 38.0 ROCKWELL C MAXIMUM OVERALL |
| Nominal Overall Length | 3.656 INCHES IN |
| Second Step Nominal Length | 0.138 INCHES SECOND END IN |
| Style Designator | PROTRUDING HUBS |
| Material Document and Classification | S-13048 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Pitch Diameter | 6.9197 INCHES NOMINAL IN |
| Tooth Form | STUB |
| First Step Nominal Diameter | 2.061 INCHES FIRST END IN |
| Hub Style Designator | 1 GROOVE SECOND END |
| Spline Quantity | 14 BOTH ENDS |
| End Nominal Length | 0.844 INCHES FIRST END IN |
| Nominal Outside Diameter | 7.058 INCHES IN |
| End Nominal Diameter | 1.969 INCHES FIRST END IN |
| Pressure Angle | 20.0000 DEGREES |
| Material | STEEL COMP TS8615 OVERALL |
| Counterbore Nominal Depth | 2.4060 INCHES SECOND END IN |
| First Groove Nominal Width | 0.031 INCHES FIRST END IN |
| Spline Pitch Diameter | 1.4000 INCHES NOMINAL BOTH ENDS 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 |
|---|---|
| 8756469 PRIMARY | U S Army Tank Automotive Command Amsta-Im-Mm (USA) |
| Reference | Meaning |
|---|---|
| 3020006798020 | 5/9 Secondary reference E.c.a Etablissement Centrald'approvisionnement Des Forces Armee |
NSN 3020-00-679-8020 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 3020-00-679-8020 has 1 manufacturer part number on file: 8756469 (U S Army Tank Automotive Command Amsta-Im-Mm).
Key specifications for 8756469: Bore Nominal Diameter: 1.305 INCHES BOTH ENDS IN; Helix Angle: 17.9386 DEGREES; Hub Nominal Diameter: 1.561 INCHES FIRST END IN; Teeth Quantity: 79. 30 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.