The Gear,helical, cataloged under National Stock Number 3020-00-352-7385, 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 21 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 | 3020-00-352-7385 |
| Primary Part Number | 2B1881 |
| 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 | 1.625 INCHES BOTH ENDS IN |
| Helix Angle | 25.5439 DEGREES |
| Hub Nominal Diameter | 2.438 INCHES FIRST END IN |
| Teeth Quantity | 18 |
| Body Style | PLAIN, SOLID |
| Counterbore Nominal Diameter | 2.2500 INCHES SECOND END IN |
| Tooth Direction | LEFT |
| Bore Style | PLAIN BOTH ENDS |
| Nominal Distance Between Body Face and Protruding Hub End | 0.171 INCHES FIRST END IN |
| Teeth Type | SINGLE HELIX |
| Nominal Overall Length | 1.172 INCHES IN |
| Style Designator | PROTRUDING HUB |
| Material Document and Classification | MIL-S-20166,TY U,GR M MIL SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Pitch Diameter | 2.8500 INCHES NOMINAL IN |
| Tooth Form | STANDARD |
| Hub Style Designator | PLAIN FIRST END |
| Nominal Outside Diameter | 0.208 INCHES IN |
| Pressure Angle | 20.0000 DEGREES |
| Material | STEEL COMP 1022 OVERALL |
| Counterbore Nominal Depth | 0.113 INCHES SECOND END IN |
| Face Nominal Width | 1.000 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 |
|---|---|
| 2B1881 PRIMARY | Caterpillar Inc Div Caterpillar Defense (USA) |
NSN 3020-00-352-7385 is a Gear,helical, manufactured by Caterpillar Inc Div Caterpillar Defense, classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
NSN 3020-00-352-7385 has 1 manufacturer part number on file: 2B1881 (Caterpillar Inc Div Caterpillar Defense).
Key specifications for 2B1881: Bore Nominal Diameter: 1.625 INCHES BOTH ENDS IN; Helix Angle: 25.5439 DEGREES; Hub Nominal Diameter: 2.438 INCHES FIRST END IN; Teeth Quantity: 18. 21 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.