The Gear,helical, cataloged under National Stock Number 3020-00-528-7154, 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 29 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 3020-00-528-7154 |
| Primary Part Number | 3236539 |
| Item Name | Gear,helical |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Manufacturer | Hatch & Kirk, Inc. |
| Status | ACTIVE |
| Furnished Items and Quantity | 1 PLUG |
| Bore Nominal Diameter | 3.4380 INCHES COUNTER BORE SECOND END IN |
| Helix Angle | 14.9167 DEGREES |
| Teeth Quantity | 65 |
| Body Style | WEBBED, OFFSET, WITH LIGHTENING HOLES |
| Counterbore Nominal Diameter | 3.7500 INCHES COUNTER BORE SECOND END IN |
| Tooth Direction | LEFT |
| Bore Style | W/COUNTERBORE COUNTER BORE SECOND END |
| Mounting Hole Type and Quantity | 4 THREADED AXIALLY THROUGH HUB FIRST END |
| Nominal Distance Between Body Face and Protruding Hub End | 1.125 INCHES BOTH ENDS IN |
| First Step Nominal Length | 0.1250 INCHES BOTH ENDS IN |
| Teeth Type | SINGLE HELIX |
| Style Designator | PROTRUDING HUBS |
| Material Document and Classification | MIL-S-890,CLASS B MIL SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Pitch Diameter | 13.0000 INCHES NOMINAL IN |
| Tooth Form | STANDARD |
| First Step Nominal Diameter | 6.5000 INCHES BOTH ENDS IN |
| Hub Style Designator | 1 STEP BOTH ENDS |
| Mounting Hole Nominal Thread Size | 0.5000 INCHES AXIALLY THROUGH HUB FIRST END IN |
| End Nominal Length | 1.6250 INCHES BOTH ENDS IN |
| Nominal Outside Diameter | 13.2850 INCHES IN |
| Mounting Hole Thread Quantity Per Inch | 20 AXIALLY THROUGH HUB FIRST END |
| End Nominal Diameter | 5.3720 INCHES BOTH ENDS IN |
| Pressure Angle | 20.0000 DEGREES |
| Material | STEEL OVERALL |
| Bolt Hole Circle Nominal Diameter | 4.250 INCHES AXIALLY THROUGH HUB FIRST END IN |
| Counterbore Nominal Depth | 3.6250 INCHES COUNTER BORE SECOND END IN |
| Mounting Hole Thread Series Designator | UNF AXIALLY THROUGH HUB FIRST END |
| 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 |
|---|---|
| 3236539 PRIMARY | Hatch & Kirk, Inc. (USA) |
| Reference | Meaning |
|---|---|
| 3236539 | 5/9 Secondary reference General Motors Corp Electro-Motive Div |
NSN 3020-00-528-7154 is a Gear,helical, manufactured by Hatch & Kirk, Inc., classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
NSN 3020-00-528-7154 has 1 manufacturer part number on file: 3236539 (Hatch & Kirk, Inc.).
1 possible match (shared part number, not a government interchangeability claim): 4710-01-237-8406. Verify interchangeability with system specifications before substitution.
Key specifications for 3236539: Furnished Items and Quantity: 1 PLUG; Bore Nominal Diameter: 3.4380 INCHES COUNTER BORE SECOND END IN; Helix Angle: 14.9167 DEGREES; Teeth Quantity: 65. 29 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.