The Gear,helical, cataloged under National Stock Number 3020-00-239-5506, 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 22 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3020-00-239-5506 |
| Primary Part Number | 3230644 |
| Item Name | Gear,helical |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Manufacturer | Hatch & Kirk, Inc. |
| Status | ACTIVE |
| Keyway Nominal Width | 0.189 INCHES BOTH ENDS IN |
| Bore Nominal Diameter | 1.000 INCHES BOTH ENDS IN |
| Helix Angle | 10.0000 DEGREES |
| Hub Nominal Diameter | 1.422 INCHES FIRST END IN |
| Teeth Quantity | 10 |
| Body Style | PLAIN, SOLID |
| Tooth Direction | RIGHT |
| Bore Style | W/ KEYWAY BOTH ENDS |
| Nominal Distance Between Body Face and Protruding Hub End | 0.250 INCHES FIRST END IN |
| Teeth Type | SINGLE HELIX |
| Hardness Rating | 57.0 ROCKWELL C MINIMUM AND 61.0 ROCKWELL C MAXIMUM OVERALL |
| Nominal Overall Length | 1.000 INCHES IN |
| Style Designator | PROTRUDING HUB |
| Material Document and Classification | MIL-S-869,CLASS B MIL SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Pitch Diameter | 2.0000 INCHES NOMINAL IN |
| Tooth Form | STANDARD |
| Hub Style Designator | PLAIN FIRST END |
| Nominal Outside Diameter | 2.3995 INCHES IN |
| Nominal Distance From Bore Center to Keyway Bottom | 0.593 INCHES BOTH ENDS IN |
| Pressure Angle | 28.0000 DEGREES |
| Material | STEEL COMP EZ OVERALL |
| Face Nominal Width | 0.750 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 |
|---|---|
| 3230644 PRIMARY | Hatch & Kirk, Inc. (USA) |
| Reference | Meaning |
|---|---|
| N9848PC22 | 5/9 Secondary reference General Motors Corp Electro-Motive Div |
| 3230644 | 5/9 Secondary reference General Motors Corp Electro-Motive Div |
NSN 3020-00-239-5506 is a Gear,helical, manufactured by Hatch & Kirk, Inc., classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
NSN 3020-00-239-5506 has 1 manufacturer part number on file: 3230644 (Hatch & Kirk, Inc.).
Key specifications for 3230644: Keyway Nominal Width: 0.189 INCHES BOTH ENDS IN; Bore Nominal Diameter: 1.000 INCHES BOTH ENDS IN; Helix Angle: 10.0000 DEGREES; Hub Nominal Diameter: 1.422 INCHES FIRST END IN. 22 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.