The Gear,helical, cataloged under National Stock Number 3020-00-294-7535, 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 20 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3020-00-294-7535 |
| Primary Part Number | 3274591 |
| Item Name | Gear,helical |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Manufacturer | Hatch & Kirk, Inc. |
| Status | ACTIVE |
| Bore Nominal Diameter | 1.251 INCHES FIRST END IN |
| Helix Angle | 45.0000 DEGREES |
| Hub Nominal Diameter | 2.2485 INCHES FIRST END IN |
| Teeth Quantity | 25 |
| Body Style | WEBBED, SOLID |
| Counterbore Nominal Diameter | 1.3125 INCHES BOTH ENDS IN |
| Tooth Direction | LEFT |
| Bore Style | PLAIN BOTH ENDS |
| Nominal Distance Between Body Face and Protruding Hub End | 1.313 INCHES BOTH ENDS IN |
| Teeth Type | SINGLE HELIX |
| Style Designator | PROTRUDING HUBS |
| Material Document and Classification | 66 FED STD SINGLE MATERIAL RESPONSE AND AISI/SAE 1035 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Pitch Diameter | 5.8926 INCHES NOMINAL IN |
| Tooth Form | STANDARD |
| Hub Style Designator | PLAIN BOTH ENDS |
| Nominal Outside Diameter | 6.225 INCHES IN |
| Pressure Angle | 14.5000 DEGREES |
| Material | STEEL COMP 1035 OVERALL |
| Counterbore Nominal Depth | 1.6891 INCHES FIRST END IN |
| Face Nominal Width | 2.750 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 |
|---|---|
| 3274591 PRIMARY | Hatch & Kirk, Inc. (USA) |
| Reference | Meaning |
|---|---|
| 3274591 | 5/9 Secondary reference General Motors Corp Electro-Motive Div |
| K3291 | 5/9 Secondary reference Korody-Colyer Corp a Cr Industries Co |
NSN 3020-00-294-7535 is a Gear,helical, manufactured by Hatch & Kirk, Inc., classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
NSN 3020-00-294-7535 has 1 manufacturer part number on file: 3274591 (Hatch & Kirk, Inc.).
1 possible match (shared part number, not a government interchangeability claim): 4320-01-640-9399. Verify interchangeability with system specifications before substitution.
Key specifications for 3274591: Bore Nominal Diameter: 1.251 INCHES FIRST END IN; Helix Angle: 45.0000 DEGREES; Hub Nominal Diameter: 2.2485 INCHES FIRST END IN; Teeth Quantity: 25. 20 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.