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When a stripped or undersized gear brings your build to a halt, you need a replacement that holds up under real load. Engineers, CNC builders, robotics hobbyists, and automation integrators rely on dimensionally consistent, torque-rated spur gears to keep their drive trains running without play or premature wear.
These 2M module spur gears are machined from 45# carbon steel and are available in a wide tooth-count range from 10T to 127T. The 2M (2 mm) module standard means each gear has a 2 mm pitch diameter per tooth, with an outer diameter ranging from approximately 24 mm (0.94 in) for the 10T up to approximately 258 mm (10.16 in) for the 127T. Bore diameter and hub dimensions vary by tooth count — see variant options for exact specs.
Typical use cases include CNC router axis drives and rack-and-pinion setups, DC motor gearbox stages in robotics and automation rigs, and DIY lathe or milling machine feed-drive replacements where a standard 2M pitch gear is required.
Machined from 45# medium-carbon steel for a balance of machinability, surface hardness, and tensile strength suited to moderate-to-heavy drive loads.
2 mm module (2M) conforms to ISO/DIN gear standards, ensuring direct interchangeability with other 2M-pitch components in your drivetrain.
79 tooth-count variants from 10T to 127T let you dial in the exact gear ratio your application demands without custom machining.
Tooth profile and pitch diameter are held to close tolerances, minimizing backlash and ensuring smooth mesh with mating 2M gears across the full tooth-count range.
The bore can be bored out or keywayed to match your shaft diameter, giving you flexibility for retrofit and custom drive applications.
Suitable for CNC machines, robotics, conveyor drives, 3D printer extruder stages, and general-purpose motor gearbox assemblies requiring a 2M pitch gear.
| Module | 2M (2 mm) |
|---|---|
| Tooth Count Range | 10T – 127T (see variant options) |
| Pressure Angle | 20° |
| Material | 45# Carbon Steel |
| Outer Diameter | See variant options |
| Pitch Diameter | (Tooth Count × 2) mm |
| Bore Diameter | See variant options |
| Hub Width / Face Width | See variant options |
| Surface Finish | Natural / uncoated (machined) |
| Packing Quantity | 1 pc per order |
Determine your required gear ratio first: divide the driver tooth count by the driven tooth count to get the ratio. For example, a 20T driver meshing with a 40T driven gear gives a 2:1 reduction. Match the tooth counts to your shaft center distance using the formula: Center Distance = (T1 + T2) × Module / 2. For a 2M gear pair, Center Distance (mm) = (T1 + T2) × 1.
45# carbon steel spur gears at 2M module are suited for moderate-to-heavy duty applications. Exact torque capacity depends on tooth count, face width, and operating speed. For high-shock or continuous heavy-load applications, consider surface hardening (induction hardening) of the bore and tooth flanks after purchase, or contact us to confirm suitability for your specific load case.
45# carbon steel has moderate corrosion resistance. For environments with moisture, coolant exposure, or outdoor use, we recommend applying a light machine oil coating during storage and operation, or considering a zinc-plated or stainless alternative. These gears are supplied in a natural machined finish without additional corrosion treatment.
Yes — any gear with a 2M module and 20° pressure angle will mesh correctly with these gears. Verify that your existing rack or mating gear is also 2M module and 20° pressure angle before ordering. Module and pressure angle must match for proper mesh; tooth count only affects gear ratio and center distance.
Bore diameter varies by tooth count — please refer to the variant detail or contact us to confirm the bore for your selected tooth count. The 45# steel is readily machinable, so the bore can be enlarged or a keyway can be cut on a lathe or mill to fit your specific shaft diameter. Do not exceed the recommended maximum bore for each tooth count to maintain adequate wall thickness.
Smaller tooth counts (10T–20T) are typically used as driver pinions on motor shafts where you want speed reduction and torque multiplication. Larger tooth counts (60T+) are used as driven gears to achieve higher reduction ratios or as idler gears in multi-stage gearboxes. For a single-stage reduction, pair a small driver with a large driven gear. For a 1:1 speed transmission, use equal tooth counts on both shafts.
Each order includes 1 piece (1 pc) of the selected tooth-count variant. If you need multiple gears — for example, a matched driver/driven pair — add each tooth count to your cart separately and adjust quantities as needed.
