The Gear,helical, cataloged under National Stock Number 3020-00-391-9537, 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3020-00-391-9537 |
| Primary Part Number | 3245148 |
| Item Name | Gear,helical |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Manufacturer | Hatch & Kirk, Inc. |
| Status | ACTIVE |
| Bore Nominal Diameter | 4.063 INCHES COUNTER BORE SECOND END IN |
| Helix Angle | 26.4056 DEGREES |
| Hub Nominal Diameter | 7.000 INCHES FIRST END IN |
| Teeth Quantity | 57 |
| Body Style | WEBBED, SOLID |
| Counterbore Nominal Diameter | 6.127 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 HUB FIRST END |
| Mounting Hole Nominal Diameter | 0.469 INCHES AXIALLY THROUGH HUB FIRST END IN |
| Teeth Type | SINGLE HELIX |
| Hardness Rating | 89.25 ROCKWELL B MINIMUM AND 96.85 ROCKWELL B MAXIMUM OVERALL |
| Style Designator | FLUSH HUB |
| Material Document and Classification | 66 FED STD SINGLE MATERIAL RESPONSE AND AIS/SAE 1035 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Pitch Diameter | 10.6066 INCHES NOMINAL IN |
| Tooth Form | STANDARD |
| Hub Style Designator | PLAIN FIRST END |
| Nominal Outside Diameter | 10.937 INCHES IN |
| Pressure Angle | 14.5000 DEGREES |
| Material | STEEL COMP 1035 OVERALL |
| Counterbore Nominal Depth | 0.563 INCHES COUNTER BORE SECOND END IN |
| Attachment Method | MOUNTING HOLE |
| Body Recess Nominal Depth | 0.813 INCHES SECOND END IN |
| Face Nominal Width | 2.000 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 |
|---|---|
| 3245148 PRIMARY | Hatch & Kirk, Inc. (USA) |
| Reference | Meaning |
|---|---|
| 3245148 | 5/9 Secondary reference General Motors Corp Electro-Motive Div |
NSN 3020-00-391-9537 is a Gear,helical, manufactured by Hatch & Kirk, Inc., classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
NSN 3020-00-391-9537 has 1 manufacturer part number on file: 3245148 (Hatch & Kirk, Inc.).
Key specifications for 3245148: Bore Nominal Diameter: 4.063 INCHES COUNTER BORE SECOND END IN; Helix Angle: 26.4056 DEGREES; Hub Nominal Diameter: 7.000 INCHES FIRST END IN; Teeth Quantity: 57. 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.