The Gear,helical, cataloged under National Stock Number 3020-00-243-7289, 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through both NSN and commercial part number lookups. 11 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3020-00-243-7289 |
| Primary Part Number | 3245176 |
| Item Name | Gear,helical |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Manufacturer | Hatch & Kirk, Inc. |
| Status | ACTIVE |
| Bore Nominal Diameter | 4.0620 INCHES BOTH ENDS IN |
| Helix Angle | 28.1391 DEGREES |
| Nominal Distance Between Body Face and Recessed Hub End | 0.9843 INCHES BOTH ENDS IN |
| Teeth Quantity | 53 |
| Body Style | WEBBED, SOLID |
| Counterbore Nominal Diameter | 6.1265 INCHES COUNTER BORE SECOND END IN |
| Tooth Direction | LEFT |
| Bore Style | W/COUNTERBORE COUNTER BORE SECOND END |
| Mounting Hole Type and Quantity | 6 PLAIN AXIALLY THROUGH BODY FIRST END |
| Mounting Hole Nominal Diameter | 0.468 INCHES AXIALLY THROUGH BODY FIRST END IN |
| Teeth Type | SINGLE HELIX |
| Style Designator | RECESSED HUBS |
| Material Document and Classification | 66 FED STD SINGLE MATERIAL RESPONSE AND AISI/SAE 1035 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Pitch Diameter | 12.0208 INCHES NOMINAL IN |
| Tooth Form | STANDARD |
| Nominal Outside Diameter | 12.419 INCHES IN |
| Pressure Angle | 14.5000 DEGREES |
| Material | STEEL COMP 1035 OVERALL |
| Bolt Hole Circle Nominal Diameter | 5.187 INCHES AXIALLY THROUGH BODY FIRST END IN |
| Counterbore Nominal Depth | 0.593 INCHES COUNTER BORE SECOND END IN |
| Attachment Method | MOUNTING HOLE |
| Face Nominal Width | 2.250 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 |
|---|---|
| 3245176 PRIMARY | Hatch & Kirk, Inc. (USA) |
| Reference | Meaning |
|---|---|
| 81127S41-26286ALT4PC10 | 5/9 Secondary reference Naval Sea Systems Command |
| SS198S41-046PC80 | 5/9 Secondary reference Naval Sea Systems Command |
| SS212S41-045PC80 | 5/9 Secondary reference U.S. Government activity |
| SS212S41-045PC80 | 5/9 Secondary reference Naval Sea Systems Command |
| 3245176 | 5/9 Secondary reference General Motors Corp Electro-Motive Div |
| AS11S41-0135PC20 | 5/9 Secondary reference U.S. Government activity |
| 81127S41-25086ALT2PC10 | 5/9 Secondary reference U.S. Government activity |
| 81127S41-26286ALT4PC10 | 5/9 Secondary reference U.S. Government activity |
| AS11S41-0135PC20 | 5/9 Secondary reference Naval Sea Systems Command |
| SS198S41-046PC80 | 5/9 Secondary reference U.S. Government activity |
| 81127S41-25086ALT2PC10 | 5/9 Secondary reference Naval Sea Systems Command |
NSN 3020-00-243-7289 is a Gear,helical, manufactured by Hatch & Kirk, Inc., classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
NSN 3020-00-243-7289 has 1 manufacturer part number on file: 3245176 (Hatch & Kirk, Inc.).
Key specifications for 3245176: Bore Nominal Diameter: 4.0620 INCHES BOTH ENDS IN; Helix Angle: 28.1391 DEGREES; Nominal Distance Between Body Face and Recessed Hub End: 0.9843 INCHES BOTH ENDS IN; Teeth Quantity: 53. 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.