Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.
When your model, toy mechanism, or small automation project demands smooth, quiet power transfer, a mismatched or worn pinion gear becomes the weakest link. Makers, hobbyists, and prototype engineers who build RC vehicles, robotic arms, or motorized display models need a reliable main shaft pinion gear that fits precisely and runs quietly under load.
These 0.5 module helical pinion gears are molded from engineering-grade plastic (typically POM or ABS), offering a lightweight yet rigid construction. Bore diameters typically range from 2.0 mm to 3.2 mm (approx. 0.079–0.126 in), with outer diameters varying by tooth count across the available specification variants. Tooth counts span from 72 to 183 teeth depending on the selected variant.
Typical use cases include DIY gear train assemblies for motorized toy cars and robots, main shaft drive systems in small CNC or automation prototypes, and replacement pinion gears for model kits requiring 0.5 module helical tooth profiles.
Angled teeth engage progressively for smoother, quieter operation compared to straight-cut spur gears — ideal for noise-sensitive model and toy applications.
Molded from rigid plastic (typically POM or ABS) for a balance of low weight, dimensional stability, and adequate load capacity in light-duty drive trains.
Conforms to the 0.5 module (m0.5) gear standard, ensuring direct interchangeability with other m0.5 gears in your assembly without custom machining.
Available in variants from 72A to 183A tooth configurations, letting you dial in the exact gear ratio your mechanism requires without compromise.
Bore diameters of 2.3 mm and 3.17 mm variants are available alongside standard bore sizes, accommodating a range of motor shaft and axle diameters common in DIY projects.
Order as a single piece for prototyping or in a 5-pack for production builds and spares — choose your quantity in the Amount option above.
| Module | 0.5 (m0.5) |
|---|---|
| Tooth Profile | Helical |
| Material | Engineering-grade plastic (POM or ABS) |
| Tooth Count | See variant options |
| Outer Diameter | See variant options |
| Bore Diameter | See variant options (typically 2.0–3.2 mm / 0.079–0.126 in) |
| Gear Width | See variant options |
| Color / Finish | See variant options (Blue, White, Orange-Red available) |
| Pack Quantity | 1 pc or 5 pcs (select above) |
| Application | DIY models, toy mechanisms, robotics, small automation |
Match the tooth count to your required gear ratio. Divide the driven gear's tooth count by the driving gear's tooth count to get the ratio. For example, pairing a 20-tooth motor gear with a 100-tooth output gear gives a 5:1 reduction. Select the variant closest to your calculated pinion tooth count.
Measure your motor shaft or axle diameter with calipers. Common motor shaft sizes in DIY projects are 2.0 mm, 2.3 mm, and 3.17 mm. Choose the variant whose bore matches your shaft. If your shaft is slightly undersized, a set screw or adhesive can secure the fit.
These gears are designed for light-duty applications such as toy mechanisms, model assemblies, and small robotic joints. They handle low-to-moderate torque loads well. For high-torque or continuous industrial duty, metal gears are recommended instead.
POM (Delrin) plastic offers good moisture resistance and dimensional stability in humid environments. ABS variants are suitable for indoor use. Neither material is rated for prolonged UV or outdoor exposure without protective housing. For outdoor builds, consider enclosing the gear train.
These are helical gears with a 0.5 module pitch. They are not directly interchangeable with spur gears of the same module because the helix angle changes the effective tooth engagement. They should be paired with matching m0.5 helical gears of the same helix angle for proper meshing.
The "Lengthened" and "Long section" variants have an extended gear width or hub length compared to the standard variants. This provides more tooth engagement surface and a longer shaft grip, which is useful when your design requires extra axial stability or a deeper gear mesh.
These m0.5 plastic helical gears are suitable for light-duty motion control in DIY CNC and extruder prototypes where torque demands are low. For production-grade 3D printer extruders that run continuously under load, metal gears are a more durable choice.
