The Gear,helical, cataloged under National Stock Number 3020-00-709-5860, 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 3020-00-709-5860 |
| Primary Part Number | 10866163 |
| 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 | 2.468 INCHES FIRST END IN |
| Body Style | WEBBED, SOLID |
| Counterbore Nominal Diameter | 1.626 INCHES FIRST END IN |
| Tooth Direction | LEFT |
| Bore Style | INVOLUTE SPLINE BOTH ENDS |
| Nominal Distance Between Body Face and Protruding Hub End | 1.011 INCHES SECOND END IN |
| Nominal Distance Between Body Face and Protruding Hub End | 1.473 INCHES FIRST END IN |
| First Step Nominal Length | 0.687 INCHES FIRST END IN |
| First Step Nominal Length | 0.381 INCHES SECOND END IN |
| Mounting Hole Nominal Diameter | 0.187 INCHES TRANSVERSELY THROUGH HUB FIRST END IN |
| Teeth Type | SINGLE HELIX |
| Hardness Rating | 58.0 ROCKWELL C MINIMUM AND 62.0 ROCKWELL C MAXIMUM OVERALL |
| Nominal Overall Length | 3.484 INCHES IN |
| Second Step Nominal Length | 0.223 INCHES FIRST END IN |
| Style Designator | PROTRUDING HUBS |
| Material Document and Classification | MIL-S-13046 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Pitch Diameter | 7.0073 INCHES NOMINAL IN |
| Tooth Form | STUB |
| First Step Nominal Diameter | 1.995 INCHES FIRST END IN |
| First Step Nominal Diameter | 2.468 INCHES SECOND END IN |
| Hub Style Designator | 2 STEPS FIRST END |
| Hub Style Designator | 1 STEP SECOND END |
| Spline Quantity | 14 BOTH ENDS |
| End Nominal Length | 1.011 INCHES SECOND END IN |
| End Nominal Length | 1.473 INCHES FIRST END IN |
| Nominal Outside Diameter | 7.145 INCHES IN |
| End Nominal Diameter | 1.879 INCHES FIRST END 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 |
|---|---|
| 10866163 PRIMARY | U S Army Tank Automotive Command Amsta-Im-Mm (USA) |
| Reference | Meaning |
|---|---|
| 3020007095860 | 5/9 Secondary reference E.c.a Etablissement Centrald'approvisionnement Des Forces Armee |
NSN 3020-00-709-5860 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 3020-00-709-5860 has 1 manufacturer part number on file: 10866163 (U S Army Tank Automotive Command Amsta-Im-Mm).
Key specifications for 10866163: Bore Nominal Diameter: 1.305 INCHES BOTH ENDS IN; Helix Angle: 17.9386 DEGREES; Teeth Quantity: 80; Second Step Nominal Diameter: 2.468 INCHES FIRST END IN. 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.