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When your motor shaft spins but nothing moves reliably, the culprit is almost always a poorly matched gear. Hobbyists, robotics builders, and small-machine designers who need repeatable, low-backlash power transfer rely on standardized module gears to keep their builds running true. These Module 1M cylindrical spur gears are engineered for direct-drive and reduction applications where tooth count and bore diameter must be specified precisely.
Each gear is machined from engineering-grade material (typically brass or steel alloy — see variant options for confirmed material per listing). The tooth profile follows the standard Module 1 (1M) pitch, with outer diameters ranging from approximately 12 mm (10T) to 22 mm (20T) — roughly 0.47 in to 0.87 in — and bore sizes spanning 4 mm to 12.7 mm (0.16 in to 0.50 in). Stepless-bore and D-bore variants are available for select sizes.
Typical use cases include DC gear-motor output shafts in robotics arms, 3D printer extruder drives requiring a module 1M spur gear replacement, and small CNC or automation rigs needing a cylindrical transmission gear with a specific tooth count between 10T and 20T.
Full 1M involute tooth geometry ensures smooth meshing and interchangeability with any standard Module 1 rack or mating gear in your drivetrain.
Nine tooth-count options let you dial in your gear ratio precisely — from compact 10T pinions to larger 20T driven gears — without custom machining.
Bore options from 4 mm to 12.7 mm (0.16 in to 0.50 in) cover the most common DC motor and stepper shaft diameters. Stepless and D-bore variants available for select sizes.
Machined from durable alloy material (see variant options to confirm material per SKU) for reliable torque transmission in continuous-duty motor applications.
Order one gear for prototyping or a 30-piece pack for production runs and workshop stock — both options available for most tooth count and bore combinations.
The straight-cut cylindrical spur gear form delivers predictable, low-noise power transfer suitable for light-to-medium load motor transmission applications.
| Gear Module | 1M (Module 1) |
|---|---|
| Tooth Count (T) | 10T, 12T, 14T, 15T, 16T, 17T, 18T, 19T, 20T |
| Bore Diameter | 4 mm, 5 mm, 6 mm, 6.35 mm, 7 mm, 8 mm, 10 mm, 11 mm, 12 mm, 12.7 mm (see variant options) |
| Bore Type | Round (standard) / Stepless / D-bore (see variant options) |
| Outer Diameter (approx.) | 12 mm (10T) to 22 mm (20T) — approximately 0.47 in to 0.87 in |
| Gear Type | Cylindrical Spur Gear (straight-cut) |
| Pressure Angle | 20° (standard involute) |
| Material | See variant options |
| Finish / Colour | See variant options |
| Packing Quantity | 1 pc or 30 pcs (see variant options) |
| Weight (per piece) | See variant options |
Your gear ratio is determined by dividing the driven gear tooth count by the driving gear tooth count. For example, pairing a 10T motor pinion with a 20T output gear gives a 2:1 reduction. Select your tooth counts based on the speed and torque trade-off your application requires. Lower tooth counts on the motor side increase torque; higher tooth counts increase speed.
Measure your motor shaft diameter with calipers before ordering. Common DC motor shaft sizes are 3 mm, 4 mm, 5 mm, 6 mm, and 6.35 mm (1/4 in). For a secure fit, the bore should match the shaft diameter exactly. If your shaft has a flat (D-cut), select a D-bore variant. If you need a set-screw fit on a round shaft, a standard round bore is appropriate.
A stepless bore is a smooth, uninterrupted cylindrical hole with no keyway or flat. It is designed to be used with a set screw or adhesive bonding to secure the gear to the shaft. This gives you flexibility to position the gear at any rotational angle before locking it in place.
Yes. All gears in this listing follow the standard Module 1 (1M) involute tooth profile with a 20° pressure angle, which is the international standard. They will mesh correctly with any other standard 1M spur gear, rack, or pinion of the same module, regardless of brand or source.
Load capacity depends on the material variant, tooth count, and operating speed. As a conservative guideline for light-to-medium duty motor applications (hobby robotics, 3D printers, small automation), these gears are suitable for continuous torque loads typically encountered with motors rated up to a few watts. For confirmed load ratings, refer to the specific variant material data or contact us to confirm.
For metal variants, a light application of gear grease or machine oil on the tooth faces is recommended for continuous-duty use to reduce wear and noise. For intermittent or low-speed applications, dry running is generally acceptable. Avoid over-lubrication, which can attract debris and accelerate wear.
Yes. Module 1M spur gears are commonly used in 3D printer extruder gear sets, CNC axis drives, and small automation systems. Verify that your existing gear set uses Module 1 pitch and that the bore matches your motor shaft before ordering. The 30-piece pack option is cost-effective for workshop stock or production builds.
