The Gear,helical, cataloged under National Stock Number 3020-00-679-4491, 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 27 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3020-00-679-4491 |
| Primary Part Number | 7710937 |
| 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 | 1.442 INCHES SECOND END IN |
| Helix Angle | 10.0000 DEGREES |
| Teeth Quantity | 36 |
| Body Style | PLAIN, SOLID |
| Counterbore Nominal Diameter | 1.651 INCHES FIRST END IN |
| Tooth Direction | RIGHT |
| Bore Style | INVOLUTE SPLINE BOTH ENDS |
| Nominal Distance Between Body Face and Protruding Hub End | 3.969 INCHES FIRST END IN |
| First Step Nominal Length | 2.031 INCHES FIRST END IN |
| Teeth Type | SINGLE HELIX |
| Hardness Rating | 30.0 ROCKWELL C MINIMUM AND 55.0 ROCKWELL C MAXIMUM OVERALL |
| Nominal Overall Length | 8.875 INCHES IN |
| Style Designator | PROTRUDING HUBS |
| Material Document and Classification | 46172 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Pitch Diameter | 6.0926 INCHES NOMINAL IN |
| Tooth Form | STANDARD |
| First Step Nominal Diameter | 2.562 INCHES FIRST END IN |
| Hub Style Designator | 1 STEP FIRST END |
| Spline Quantity | 15 BOTH ENDS |
| End Nominal Length | 1.938 INCHES FIRST END IN |
| Nominal Outside Diameter | 4.649 INCHES IN |
| End Nominal Diameter | 2.165 INCHES FIRST END IN |
| Pressure Angle | 25.3375 DEGREES |
| Material | STEEL COMP 8640H OVERALL |
| Counterbore Nominal Depth | 4.824 INCHES FIRST END IN |
| Spline Pitch Diameter | 1.5000 INCHES NOMINAL BOTH ENDS IN |
| Face Nominal Width | 2.125 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 |
|---|---|
| 7710937 PRIMARY | U S Army Tank Automotive Command Amsta-Im-Mm (USA) |
| Reference | Meaning |
|---|---|
| 3020006794491 | 6/9 Informative reference only E.c.a Etablissement Central Des Approvisionnements Des Forces Armees Royales |
| 62.71.029.A | 5/9 Secondary reference Sapa Operaciones SL |
NSN 3020-00-679-4491 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 3020-00-679-4491 has 1 manufacturer part number on file: 7710937 (U S Army Tank Automotive Command Amsta-Im-Mm).
Key specifications for 7710937: Bore Nominal Diameter: 1.442 INCHES SECOND END IN; Helix Angle: 10.0000 DEGREES; Teeth Quantity: 36; Body Style: PLAIN, SOLID. 27 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.