The Gear,helical, cataloged under National Stock Number 3020-00-264-9640, 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 24 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 3 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3020-00-264-9640 |
| Primary Part Number | 3244185 |
| Item Name | Gear,helical |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Manufacturer | Hatch & Kirk, Inc. |
| Status | ACTIVE |
| Bore Nominal Diameter | 2.9557 INCHES BOTH ENDS IN |
| Helix Angle | 23.0000 DEGREES |
| Teeth Quantity | 26 |
| Body Style | PLAIN, SOLID |
| Tooth Direction | RIGHT |
| Bore Style | STRAIGHT SPLINE BOTH ENDS |
| Nominal Distance Between Body Face and Protruding Hub End | 4.4375 INCHES FIRST END IN |
| First Step Nominal Length | 0.500 INCHES FIRST END IN |
| Teeth Type | SINGLE HELIX |
| Hardness Rating | 58.0 ROCKWELL C MINIMUM AND 61.0 ROCKWELL C MAXIMUM HUB |
| Hardness Rating | 58.0 ROCKWELL C MINIMUM AND 61.0 ROCKWELL C MAXIMUM TEETH |
| Style Designator | PROTRUDING HUB |
| Material Document and Classification | MIL-S-890,ALLOY NO. 3 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Pitch Diameter | 6.4200 INCHES NOMINAL IN |
| Tooth Form | STANDARD |
| First Step Nominal Diameter | 6.500 INCHES FIRST END IN |
| Hub Style Designator | 1 STEP FIRST END |
| Spline Quantity | 10 BOTH ENDS |
| End Nominal Length | 3.9375 INCHES FIRST END IN |
| Nominal Outside Diameter | 6.8700 INCHES IN |
| End Nominal Diameter | 5.906 INCHES FIRST END IN |
| Pressure Angle | 20.0000 DEGREES |
| Material | STEEL OVERALL |
| Face Nominal Width | 3.750 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 |
|---|---|
| 3244185 PRIMARY | Hatch & Kirk, Inc. (USA) |
| Reference | Meaning |
|---|---|
| 6-1605 | 3/2 Design control — primary reference U.S. Government activity |
| 3244185 | 5/9 Secondary reference General Motors Corp Electro-Motive Div |
| 3244185 | 3/2 Design control — primary reference U.S. Government activity |
NSN 3020-00-264-9640 is a Gear,helical, manufactured by Hatch & Kirk, Inc., classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
NSN 3020-00-264-9640 has 1 manufacturer part number on file: 3244185 (Hatch & Kirk, Inc.).
3 possible matches (shared part number, not a government interchangeability claim): 4920-01-032-5094, 1650-01-110-8267, 1005-01-464-1521. Verify interchangeability with system specifications before substitution.
Key specifications for 3244185: Bore Nominal Diameter: 2.9557 INCHES BOTH ENDS IN; Helix Angle: 23.0000 DEGREES; Teeth Quantity: 26; Body Style: PLAIN, SOLID. 24 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.