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When a slipping or mismatched gear brings your build to a halt, you need a replacement you can trust to mesh perfectly and hold up under load. Whether you are a robotics hobbyist, a CNC builder, or a mechanical engineer prototyping a custom drive train, finding a consistent, accurately cut spur gear in the exact tooth count you need should not be a project in itself.
These 2 Module (2M) spur gears are machined from 45 carbon steel, delivering a solid balance of hardness and machinability. The module 2 pitch means a tooth pitch of approximately 6.28 mm (0.247 in), with an outer diameter that scales from roughly 24 mm (0.94 in) for the 10-tooth gear up to approximately 120 mm (4.72 in) for the 58-tooth gear. Face width is typically 10–20 mm depending on tooth count. Available in 10 T through 58 T (select sizes), sold individually or in multi-packs of 2, 3, 5, or 10 pieces.
Typical use cases include DC motor output shafts in tabletop robotics and automation rigs, reduction stages in DIY CNC axis drives, and replacement gears in light industrial conveyor or indexing mechanisms — anywhere a standard 2M metric spur gear is called for.
| Module | 2 (2M) |
|---|---|
| Tooth Count Range | 10 T – 58 T (select increments) |
| Material | 45 Carbon Steel |
| Pressure Angle | 20° |
| Outer Diameter | See variant options |
| Bore Diameter | See variant options |
| Face Width | Typically 10–20 mm (0.39–0.79 in) |
| Tooth Pitch (circular) | ≈ 6.28 mm (0.247 in) |
| Finish | Natural machined steel |
| Available Quantities | 1 / 2 / 3 / 5 / 10 pcs |
Divide the desired gear ratio by the driver tooth count to find the driven gear tooth count. For example, a 3:1 reduction with a 10 T pinion requires a 30 T gear. Use our full range (10 T–58 T) to achieve ratios from roughly 1:1 up to approximately 5.8:1 in a single stage.
Yes. Any gear, rack, or pinion manufactured to the Module 2 (2M) standard with a 20° pressure angle will mesh correctly with these gears. Verify the module and pressure angle markings on your existing components before ordering.
45 carbon steel offers a tensile strength typically in the 600–800 MPa range in the as-machined condition. These gears are well suited to moderate-load applications such as robotics, light CNC axes, and automation. For heavy shock loads or continuous high-torque duty, consider hardened or alloy steel alternatives.
45 carbon steel is not inherently corrosion resistant. For outdoor or humid environments, apply a light machine oil or grease after installation, or consider a surface treatment such as black oxide or zinc plating. Keep gears lubricated during operation to extend service life.
Bore diameter varies by tooth count — please refer to the variant detail or contact us to confirm the bore for your specific size. Because these are solid 45 steel gears, they can be re-bored or broached by a machine shop to accept a custom shaft diameter or keyway, provided sufficient wall thickness remains.
Order a single piece for prototyping or a one-off replacement. Multi-packs (2, 3, 5, or 10 pcs) offer a lower per-unit cost and are practical when building matched gear pairs, assembling multiple identical axes, or keeping spares on hand for ongoing projects.
The module number defines the tooth size: a higher module means larger, stronger teeth with a coarser pitch. Module 1 gears are smaller and suited to light loads; Module 1.5 sits in between; Module 2 gears are larger and handle moderate loads more comfortably. Gears of different modules cannot mesh with each other.
