The Gear,helical, cataloged under National Stock Number 3020-00-243-7290, 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 18 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through both NSN and commercial part number lookups. 11 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 3020-00-243-7290 |
| Primary Part Number | 3245175 |
| Item Name | Gear,helical |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Manufacturer | Hatch & Kirk, Inc. |
| Status | ACTIVE |
| Bore Nominal Diameter | 4.0625 INCHES BOTH ENDS IN |
| Helix Angle | 28.1391 DEGREES |
| Hub Nominal Diameter | 7.125 INCHES FIRST END IN |
| Teeth Quantity | 53 |
| Body Style | WEBBED, SOLID |
| Counterbore Nominal Diameter | 6.126 INCHES SECOND END IN |
| Bore Style | PLAIN BOTH ENDS |
| Teeth Type | SINGLE HELIX |
| Hardness Rating | 10.0 ROCKWELL C MINIMUM AND 20.0 ROCKWELL C MAXIMUM OVERALL |
| Material Document and Classification | 66,AISI 1033 FED STD SINGLE MATERIAL RESPONSE OVERALL |
| Pitch Diameter | 12.0208 INCHES NOMINAL IN |
| Tooth Form | STANDARD |
| Hub Style Designator | PLAIN FIRST END |
| Nominal Outside Diameter | 12.419 INCHES IN |
| Pressure Angle | 14.5000 DEGREES |
| Material | STEEL OVERALL |
| Counterbore Nominal Depth | 0.3125 INCHES SECOND END IN |
| Face Nominal Width | 3.250 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 |
|---|---|
| 3245175 PRIMARY | Hatch & Kirk, Inc. (USA) |
| Reference | Meaning |
|---|---|
| AS11S41-0135PC79 | 5/9 Secondary reference U.S. Government activity |
| 81127S41-25086ALTPC9 | 5/9 Secondary reference U.S. Government activity |
| AS11S41-0135PC79 | 5/9 Secondary reference Naval Sea Systems Command |
| SS198S41-046PC79 | 5/9 Secondary reference Naval Sea Systems Command |
| 3245175 | 5/9 Secondary reference General Motors Corp Electro-Motive Div |
| 81127S41-25086ALTPC9 | 5/9 Secondary reference Naval Sea Systems Command |
| SS198S41-046PC79 | 5/9 Secondary reference U.S. Government activity |
| 81127S41-26286ALT2PC9 | 5/9 Secondary reference Naval Sea Systems Command |
| SS212S41-045PC79 | 5/9 Secondary reference Naval Sea Systems Command |
| SS212S41-045PC79 | 5/9 Secondary reference U.S. Government activity |
| 81127S41-26286ALT2PC9 | 5/9 Secondary reference U.S. Government activity |
NSN 3020-00-243-7290 is a Gear,helical, manufactured by Hatch & Kirk, Inc., classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
NSN 3020-00-243-7290 has 1 manufacturer part number on file: 3245175 (Hatch & Kirk, Inc.).
Key specifications for 3245175: Bore Nominal Diameter: 4.0625 INCHES BOTH ENDS IN; Helix Angle: 28.1391 DEGREES; Hub Nominal Diameter: 7.125 INCHES FIRST END IN; Teeth Quantity: 53. 18 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.