The Gear,helical, cataloged under National Stock Number 3020-00-333-3529, 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 23 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 3020-00-333-3529 |
| Primary Part Number | 7971914 |
| 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 |
| Furnished Items and Quantity | 1 BUSHING |
| Bore Nominal Diameter | 2.989 INCHES BOTH ENDS IN |
| Helix Angle | 20.1190 DEGREES |
| Hub Nominal Diameter | 4.610 INCHES FIRST END IN |
| Teeth Quantity | 22 |
| Clamping Surface Nominal Length | 2.990 INCHES BOTH ENDS IN |
| Body Style | PLAIN, SOLID |
| Tooth Direction | LEFT |
| Bore Style | PLAIN BOTH ENDS |
| Nominal Distance Between Body Face and Protruding Hub End | 0.788 INCHES FIRST END IN |
| Teeth Type | SINGLE HELIX |
| Hardness Rating | 60.0 ROCKWELL C MINIMUM AND 63.0 ROCKWELL C MAXIMUM OVERALL |
| Nominal Overall Length | 2.900 INCHES IN |
| Style Designator | PROTRUDING HUBS |
| Material Document and Classification | MIL-S-13048 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Pitch Diameter | 5.0769 INCHES NOMINAL IN |
| Tooth Form | STUB |
| Hub Style Designator | SPLIT FIRST END |
| Spline Quantity | 22 FIRST END |
| Pressure Angle | 22.5000 DEGREES |
| Material | STEEL OVERALL |
| Spline Pitch Diameter | 4.4000 INCHES NOMINAL FIRST END IN |
| Face Nominal Width | 2.187 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 |
|---|---|
| 7971914 PRIMARY | U S Army Tank Automotive Command Amsta-Im-Mm (USA) |
| Reference | Meaning |
|---|---|
| 741KBA1119 | 5/9 Secondary reference Mack Trucks Inc Parts Opn |
NSN 3020-00-333-3529 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 3020-00-333-3529 has 1 manufacturer part number on file: 7971914 (U S Army Tank Automotive Command Amsta-Im-Mm).
Key specifications for 7971914: Furnished Items and Quantity: 1 BUSHING; Bore Nominal Diameter: 2.989 INCHES BOTH ENDS IN; Helix Angle: 20.1190 DEGREES; Hub Nominal Diameter: 4.610 INCHES FIRST END IN. 23 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.