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When a slipping or mismatched gear brings your build to a halt, you need a replacement you can spec with confidence. These 1 modulus spur gears are designed for makers, robotics engineers, and CNC hobbyists who require dimensionally consistent, drop-in-ready drive components without guesswork.
Each gear is machined to a 1 mod (module) standard with a pitch of 3.14 mm (0.124 in) per tooth. Tooth counts span 10 to 25 teeth, yielding pitch circle diameters from approximately 10 mm (0.39 in) to 25 mm (0.98 in). Bore options range from 4 mm to 12.7 mm (0.157–0.500 in), including keyed and set-screw variants. Materials available: 45# carbon steel (unhardened), engineering-grade nylon, and 304 stainless steel.
Typical use cases include small DC motor output shafts in robotics platforms, stepper-driven axis gearing in desktop CNC routers, and custom reduction stages in 3D printer extruder assemblies — all applications where a 1 mod spur gear with a precise bore fit is non-negotiable.
3.14 mm pitch ensures direct mesh compatibility with any Mod 1 gear, rack, or pinion in your drivetrain.
10 to 25 teeth available, letting you dial in your gear ratio without sourcing from multiple suppliers.
Plain bores from 4 mm to 12.7 mm, plus keyed bores (e.g., 5×4.5 mm, 8×7 mm) for positive shaft engagement.
45# carbon steel for general-purpose torque loads; nylon for low-noise, lightweight applications; stainless steel for corrosion-sensitive environments.
Small pitch circle diameters (10–25 mm) keep your assembly tight. Nylon variants further reduce rotating mass in weight-sensitive builds.
Machined to Mod 1 standard dimensions — swap directly into existing 1 mod gear trains without modification.
| Module (Mod) | 1 |
|---|---|
| Pitch | 3.14 mm (0.124 in) |
| Tooth Count Range | 10 – 25 teeth |
| Pitch Circle Diameter Range | 10 mm – 25 mm (0.39 – 0.98 in) |
| Bore Diameter Options | 4, 5, 6, 6.35, 7, 8, 10, 11, 12, 12.7 mm; keyed bores available |
| Material Options | 45# Carbon Steel / Nylon / 304 Stainless Steel |
| Surface Finish | See variant options |
| Hardened | No (standard variants) |
| Pressure Angle | 20° (standard for Mod 1) |
| Face Width | See variant options |
| Quantity per Order | 1 piece |
Tooth count determines your gear ratio. Divide the driven gear's tooth count by the driving gear's tooth count to get the ratio. For example, a 20-tooth gear driving a 10-tooth gear gives a 2:1 speed increase. Select the combination that achieves your target RPM or torque output.
45# carbon steel handles the highest torque loads and is the most cost-effective choice for general robotics and CNC use. Nylon runs quieter, resists vibration, and is lighter — ideal for low-load, noise-sensitive builds. Stainless steel is the right pick when the gear will be exposed to moisture, mild chemicals, or food-adjacent environments where corrosion resistance matters.
Measure your motor or shaft diameter precisely with calipers. Plain bores (e.g., 5 mm, 6 mm) rely on a set screw or adhesive for retention. Keyed bores (e.g., 5×4.5 mm, 8×7 mm) use a keyway for positive, non-slip engagement and are recommended for higher-torque applications. If your shaft is imperial (e.g., 1/4 in = 6.35 mm), select the 6.35 mm bore option.
Yes. Any two gears with the same module (Mod 1) and the same pressure angle (20°, which is standard) will mesh correctly regardless of tooth count. These gears are also compatible with Mod 1 racks and pinions.
Load capacity depends on material and tooth count. 45# steel gears are suitable for moderate continuous torque in robotics and light CNC applications. Nylon gears are best for low-to-medium loads where noise reduction is a priority. Stainless steel gears offer comparable strength to carbon steel with added corrosion resistance. For exact torque ratings, contact us with your application details.
The standard variants listed here are not hardened. They are suitable for most hobbyist and light-industrial applications. If your application requires hardened gears for extended wear life under heavy cycling, contact us to confirm availability.
45# carbon steel gears will rust if exposed to moisture without protective coating — apply grease or a rust inhibitor for outdoor use. Nylon gears are inherently moisture-resistant but may absorb water over time, causing slight dimensional changes. Stainless steel gears are the best choice for consistently wet or humid environments.
