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When a stripped plastic gear or an undersized pinion brings your build to a halt, you need a metal replacement you can trust. Whether you are a robotics engineer, a CNC hobbyist, or a maker upgrading an RC drivetrain, these Mod 1 spur gears give you the dimensional accuracy and material strength to keep your project running without interruption.
Each gear is machined from 45# medium-carbon steel, delivering a tensile strength typically in the range of 600–800 MPa. The bore is finished to accept a standard shaft and can be further modified with a keyway or set-screw hole. Outer diameters range from approximately 14 mm (0.55 in) on the 12-tooth variant up to approximately 102 mm (4.02 in) on the 100-tooth variant, with a uniform Module 1 tooth pitch throughout the range.
Typical use cases include replacement pinion gears for stepper-motor CNC axes, drive gears in small conveyor or indexing systems, and stage-gear upgrades in RC car and robot competition builds where a metal-to-metal mesh is required for sustained torque loads.
| Module | 1 (Mod 1) |
|---|---|
| Tooth Count Range | 12T – 100T (82 variants) |
| Outer Diameter Range | ~14 mm – ~102 mm (0.55 in – 4.02 in) |
| Material | 45# Medium-Carbon Steel |
| Pressure Angle | 20° |
| Face Width | See variant options |
| Bore Diameter | See variant options |
| Hub Style | See variant options |
| Surface Finish | Oxidised / lightly oiled |
| Tooth Form | Involute, CNC-hobbed |
| Pack Quantity | 1 Pcs (per order unit) |
The gear ratio between two meshing gears equals the ratio of their tooth counts. For example, pairing a 12T pinion with a 60T gear gives a 5:1 reduction. Decide on your required speed reduction or torque multiplication first, then select the tooth counts that achieve that ratio while fitting within your available centre-distance.
The bore diameter varies by tooth count — please check the variant detail or contact us to confirm the exact bore size for the specific tooth count you need. The bore can be enlarged by reaming or drilling if your shaft is slightly larger than the stock bore.
Yes. All gears in this listing use the Module 1 standard with a 20° pressure angle, which is the most common metric gear standard. They will mesh correctly with any other Mod 1 component — racks, pinions, or mating spur gears — regardless of brand, as long as the module and pressure angle match.
45# steel has a typical tensile strength of 600–800 MPa and yield strength around 355–490 MPa, making it significantly stronger than brass or nylon alternatives. For continuous high-torque applications, ensure adequate lubrication and that the mating gear is of equal or greater hardness to avoid accelerated wear on one component.
The surface treatment (oxidised/oiled finish) provides basic protection against light moisture exposure during storage and short-term use. For outdoor or high-humidity environments, we recommend applying a gear grease or anti-corrosion coating after installation. For fully corrosion-resistant applications, consider stainless steel alternatives.
Yes. The 45# steel material is machinable with standard HSS or carbide tooling. You can broach a keyway, mill a flat, or drill and tap a set-screw hole using conventional workshop equipment. Ensure the wall thickness at your chosen tooth count is sufficient before removing material from the hub.
Larger tooth-count gears require more raw material and longer machining time, so price increases with tooth count. The 12T–25T range starts from around $7–$10 per piece, while the 85T–100T range is priced from approximately $62–$85 per piece. Select the exact variant above to see the precise price for your required tooth count.
