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When a worn or mismatched pinion gear causes backlash, noise, or positioning errors in your motion system, finding a dimensionally accurate replacement becomes critical. These Module 1.5 pinion spur gears are designed for engineers, CNC builders, robotics integrators, and automation technicians who need reliable, drop-in drive components with consistent tooth geometry.
Each gear is machined from #45 carbon steel, offering a solid balance of hardness and machinability. The tooth module is 1.5M, with tooth counts ranging from 12T to 35T. Outer diameters span from 21 mm (approx. 0.83 in) for the 12T up to 55.5 mm (approx. 2.19 in) for the 35T. Bore sizes range from 5 mm to 20 mm depending on the selected size option, with step hub lengths from 15 mm to 40 mm to suit various shaft configurations.
Typical applications include rack-and-pinion linear drives for CNC router gantries, rotary indexing tables in light industrial automation, and gear-reduction stages in robotics joint assemblies. The stepped hub design also makes these gears well-suited for set-screw or keyway shaft retention in compact drive trains.
Machined from #45 carbon steel for dependable strength and wear resistance in continuous-duty drive applications.
Nine tooth-count options (12T, 15T, 16T, 18T, 20T, 24T, 25T, 30T, 35T) let you dial in the exact gear ratio your system requires.
Bore options from 5 mm to 20 mm (including 6.35 mm / ¼ in for imperial shafts) cover a broad range of motor and shaft standards.
Integrated step hub (15–40 mm step length depending on variant) provides axial location and simplifies set-screw or keyway retention.
Order 1, 2, 3, 5, or 10 pieces per SKU — ideal for prototyping, spares inventory, or small-batch production builds.
Fully interchangeable with any Module 1.5 rack or mating gear, ensuring straightforward integration into existing drive systems.
| Module | 1.5M |
|---|---|
| Tooth Count (T) | 12T, 15T, 16T, 18T, 20T, 24T, 25T, 30T, 35T |
| Outer Diameter (OD) | 21 mm – 55.5 mm (0.83 in – 2.19 in), varies by tooth count |
| Bore Diameter | 5 mm, 6 mm, 6.35 mm, 7 mm, 8 mm, 10 mm, 12 mm, 14 mm, 15 mm, 16 mm, 17 mm, 20 mm (see variant options) |
| Hub Step Length | 15 mm – 40 mm (see variant options) |
| Material | #45 Carbon Steel |
| Pressure Angle | 20° (standard) |
| Tooth Profile | Involute spur |
| Surface Finish | See variant options |
| Weight (per piece) | See variant options |
| Available Quantities | 1, 2, 3, 5, 10 Pcs |
The tooth count determines the gear ratio when paired with a rack or mating gear. A lower tooth count (e.g., 12T) gives a higher reduction ratio and more torque, while a higher count (e.g., 35T) provides faster linear or rotary speed. Calculate your required ratio based on motor RPM, desired output speed, and rack pitch before selecting.
Match the bore diameter to your shaft's outer diameter. For metric shafts, choose from 5, 6, 7, 8, 10, 12, 14, 15, 16, 17, or 20 mm. For imperial shafts, the 6.35 mm (¼ in) bore option is available. If your shaft requires a keyway, confirm the hub step length is sufficient for your retention method before ordering.
#45 carbon steel provides tensile strength typically in the 600–800 MPa range, making these gears suitable for light-to-medium duty CNC, robotics, and automation drives. For heavy-duty or high-shock applications, consider whether additional heat treatment or a larger module gear is appropriate for your load requirements.
#45 carbon steel is not inherently corrosion-resistant. For environments with moisture or chemical exposure, apply a light machine oil or grease coating during installation and maintain lubrication regularly. For outdoor or wet environments, consider stainless steel or coated alternatives.
Yes. Any gear with a Module 1.5 (1.5M) tooth profile will mesh correctly with a Module 1.5 rack or mating gear, regardless of brand, as long as the pressure angle matches (standard 20°). Verify the rack's module and pressure angle specifications before pairing.
"OD" is the outer diameter of the gear teeth (the full gear diameter). "Step" refers to the length of the hub boss that extends beyond the gear face — this is the section that sits inside your bearing housing or shaft collar. Ensure the step length fits within your assembly's axial space before ordering.
Yes. Each variant is available in a 1 Pcs quantity option, allowing you to verify fit, bore clearance, and mesh quality before committing to a larger order of 2, 3, 5, or 10 pieces.
