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When your drive system demands consistent torque transfer and tight dimensional tolerances, a poorly matched gear becomes the weakest link in the chain. Engineers, robotics builders, and CNC hobbyists who need a dependable 2 Mod spur gear with a stepped hub bore will find this series purpose-built for exactly that challenge.
Each gear is machined from 45# medium-carbon steel, offering a balanced combination of hardness and toughness. The stepped hub design provides a positive axial shoulder for shaft positioning, simplifying assembly. The tooth range spans 15T to 50T (Module 2), with an outer diameter scaling from approximately 34 mm (1.34 in) at 15T up to approximately 104 mm (4.09 in) at 50T. Bore diameter and hub dimensions vary by tooth count — see variant options for exact figures.
Typical use cases include: DIY CNC router axis drives requiring a 2 Mod pinion gear for rack-and-pinion motion; small robotic arm joint reduction stages using a 2 Mod steel spur gear pair; and custom gearbox builds for electric go-karts or conveyor prototypes where a stepped hub spur gear simplifies shaft retention.
Machined from 45# steel for a hardness and toughness profile suited to moderate-to-high load drive applications without brittleness.
Full 20° pressure angle, Module 2 involute tooth form ensures interchangeability with any M2-compatible mating gear or rack in your system.
The integrated step hub provides a machined shoulder that locates the gear axially on the shaft, reducing the need for additional collars or spacers.
36 discrete sizes from 15 to 50 teeth let you dial in the exact gear ratio your drive stage requires without resorting to custom machining.
CNC-turned and hobbed to standard M2 tolerances, ensuring smooth meshing, low backlash, and predictable noise levels across the full tooth range.
Suitable for CNC axis drives, robotic joints, conveyor prototypes, electric vehicle reduction stages, and general-purpose gearbox builds requiring a 2 Mod steel spur gear.
| Module | 2 (M2) |
|---|---|
| Tooth Count Range | 15T – 50T (36 sizes) |
| Pressure Angle | 20° |
| Material | 45# Medium-Carbon Steel |
| Hub Style | Stepped hub (shoulder bore) |
| Outer Diameter | See variant options |
| Bore Diameter | See variant options |
| Hub Diameter | See variant options |
| Hub Length | See variant options |
| Face Width | See variant options |
| Surface Finish | See variant options |
| Keyway | Contact us to confirm |
| Set Screw | Contact us to confirm |
| Packing Quantity | 1 pc per order |
Select your tooth count based on the gear ratio you need. Divide the driven gear teeth by the driving gear teeth to get the ratio. For example, pairing a 2M 15T pinion with a 2M 30T gear gives a 2:1 reduction. Use smaller tooth counts for higher speed, larger counts for higher torque output.
Module (M) is the standardized metric tooth size parameter. Module 2 means the pitch diameter equals 2 × number of teeth (in mm). These gears will mesh correctly with any other standard M2 spur gear or rack that also uses a 20° pressure angle. Do not mix with Module 1.5, Module 2.5, or imperial DP gears.
45# medium-carbon steel (roughly equivalent to AISI 1045) offers a tensile strength of approximately 600–800 MPa in the normalized condition. It is well-suited for moderate-to-high torque drive stages, CNC axis drives, and robotic joints. For very high-shock or continuous heavy-duty industrial loads, consider whether a heat-treated or alloy steel variant is more appropriate for your specific duty cycle.
45# carbon steel is not inherently corrosion-resistant. For humid, wet, or outdoor environments, apply a light machine oil or grease coating during operation, or consider adding a protective surface treatment (zinc plating, black oxide, or paint) after purchase. For fully corrosion-resistant applications, a stainless steel or plastic gear may be more appropriate.
The bore diameter varies by tooth count. Please check the variant-specific dimension drawing or contact us with your tooth count selection and we will confirm the bore size. Measure your shaft diameter with calipers before ordering. A standard H7 bore tolerance is typical; if you need a custom bore, contact us prior to purchase.
The stepped hub provides axial positioning via its shoulder. Radial retention (preventing rotation on the shaft) typically requires a keyway, set screw, or interference fit. Whether a keyway or set screw is pre-machined depends on the specific variant — please contact us to confirm before ordering if shaft retention method is critical to your design.
Yes. Any tooth count in this series can function as a pinion driving a standard M2 gear rack. Smaller tooth counts (15T–20T) are commonly used as CNC axis pinions for compact drive stages. Ensure the rack is also Module 2 with a 20° pressure angle for correct meshing.
