The Gear,helical, cataloged under National Stock Number 3020-00-391-4099, 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 Hatch & Kirk, Inc.. Government technical data includes 13 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 3020-00-391-4099 |
| Primary Part Number | 3252721 |
| Item Name | Gear,helical |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Manufacturer | Hatch & Kirk, Inc. |
| Status | ACTIVE |
| Helix Angle | 25.8167 DEGREES |
| Teeth Quantity | 42 |
| Body Style | PLAIN, SOLID |
| Tooth Direction | RIGHT |
| Teeth Type | SINGLE HELIX |
| Style Designator | PROTRUDING HUBS |
| Pitch Diameter | 5.2500 INCHES NOMINAL IN |
| Tooth Form | STANDARD |
| Hub Style Designator | PLAIN BOTH ENDS |
| Mounting Hole Thread Quantity Per Inch | 24 AXIALLY THROUGH BODY FIRST END |
| Pressure Angle | 14.5000 DEGREES |
| Bolt Hole Circle Nominal Diameter | 4.250 INCHES AXIALLY THROUGH BODY FIRST END IN |
| Attachment Method | MOUNTING HOLE |
| 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 |
|---|---|
| 3252721 PRIMARY | Hatch & Kirk, Inc. (USA) |
| Reference | Meaning |
|---|---|
| 3252721 | 5/9 Secondary reference General Motors Corp Electro-Motive Div |
NSN 3020-00-391-4099 is a Gear,helical, manufactured by Hatch & Kirk, Inc., classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
NSN 3020-00-391-4099 has 1 manufacturer part number on file: 3252721 (Hatch & Kirk, Inc.).
Key specifications for 3252721: Helix Angle: 25.8167 DEGREES; Teeth Quantity: 42; Body Style: PLAIN, SOLID; Tooth Direction: RIGHT. 13 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.