The Gear,helical, cataloged under National Stock Number 3020-01-122-3846, 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 Caterpillar Inc Div Caterpillar Defense. Government technical data includes 19 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 | 3020-01-122-3846 |
| Primary Part Number | 4L3406 |
| Item Name | Gear,helical |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Manufacturer | Caterpillar Inc Div Caterpillar Defense |
| Status | ACTIVE |
| Bore Nominal Diameter | 58.7 MILLIMETERS BOTH ENDS MM |
| Helix Angle | 6.0000 DEGREES |
| Hub Nominal Diameter | 79.2 MILLIMETERS FIRST END MM |
| Hub Nominal Diameter | 80.0 MILLIMETERS SECOND END MM |
| Teeth Quantity | 40 |
| Body Style | WEBBED, OFFSET, WITH LIGHTENING HOLES |
| Tooth Direction | LEFT |
| Bore Style | PLAIN BOTH ENDS |
| Nominal Distance Between Body Face and Protruding Hub End | 25.1 MILLIMETERS FIRST END MM |
| Precision Classification | QUALITY NUMBER 10 OR QUALITY NUMBER 11 |
| Teeth Type | SINGLE HELIX |
| Style Designator | ONE PROTRUDING HUB, ONE FLUSH HUB |
| Pitch Diameter | 179.9 MILLIMETERS NOMINAL MM |
| Tooth Form | STANDARD |
| Hub Style Designator | PLAIN BOTH ENDS |
| Nominal Outside Diameter | 186.7 MILLIMETERS MM |
| Pressure Angle | 20.0000 DEGREES |
| Material | STEEL OVERALL |
| Face Nominal Width | 25.4 MILLIMETERS MM |
| 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 |
|---|---|
| 4L3406 PRIMARY | Caterpillar Inc Div Caterpillar Defense (USA) |
NSN 3020-01-122-3846 is a Gear,helical, manufactured by Caterpillar Inc Div Caterpillar Defense, classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
NSN 3020-01-122-3846 has 1 manufacturer part number on file: 4L3406 (Caterpillar Inc Div Caterpillar Defense).
Key specifications for 4L3406: Bore Nominal Diameter: 58.7 MILLIMETERS BOTH ENDS MM; Helix Angle: 6.0000 DEGREES; Hub Nominal Diameter: 79.2 MILLIMETERS FIRST END MM; Hub Nominal Diameter: 80.0 MILLIMETERS SECOND END MM. 19 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.