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When your robot arm stutters, your toy car motor skips, or your small automation project needs a reliable gear mesh, finding the right module 0.5 spur gear in the correct bore size can be a real challenge. These plastic spindle spur gears are designed for makers, hobbyists, and engineers who need compact, lightweight gear components that fit standard small-motor shafts without custom machining.
Each gear is molded from engineering-grade plastic (typically POM or ABS-class material) and follows the Module 0.5 (Mod 0.5) standard. The tooth count ranges from 8 to 18 teeth across the available models, with bore diameters spanning Ø0.5 mm to Ø5 mm (approximately 0.02 in to 0.20 in). Overall gear outer diameters typically range from approximately 5 mm to 10 mm (0.20 in to 0.39 in) depending on tooth count.
Typical use cases include small DC motor gearboxes for toy cars and RC vehicles, robotic joint drives and servo linkages for DIY automation, and educational STEM project builds requiring module 0.5 gear trains. The lightweight plastic construction reduces inertia in high-speed low-torque applications, making these gears well-suited for compact spindle gear module 0.5 assemblies.
Conforms to the Mod 0.5 gear standard for reliable meshing with other M0.5 gears in your drivetrain or gearbox assembly.
Available bore diameters from Ø0.5 mm to Ø5 mm let you match the gear directly to your motor shaft without adapters.
Molded from engineering-grade plastic to minimize rotational inertia — ideal for low-torque, high-speed toy and robot applications.
Choose from 8 to 18 teeth across 18 model variants to achieve your target gear ratio in a compact spindle gear format.
Available in packs of 1, 2, 4, 5, 10, 20, or 50 pieces — order exactly what your project or production run requires.
Injection-molded for repeatable tooth profile geometry, ensuring smooth gear mesh and consistent performance across multiple units in the same assembly.
| Gear Module | 0.5 (Mod 0.5) |
|---|---|
| Tooth Count Range | 8 – 18 teeth (see variant options) |
| Bore Diameter Range | Ø0.5 mm – Ø5 mm (see variant options) |
| Material | Engineering-grade plastic (POM/ABS class) |
| Gear Type | Spur gear (straight tooth) |
| Pressure Angle | See variant options |
| Outer Diameter (approx.) | Typically 5 – 10 mm (0.20 – 0.39 in), varies by tooth count |
| Color/Finish | See variant options |
| Pack Quantity | 1 / 2 / 4 / 5 / 10 / 20 / 50 pcs (see variant options) |
| Application | Toy motors, robotics, DIY automation, STEM projects |
Divide the driven gear tooth count by the driving gear tooth count to get your gear ratio. For example, pairing an 8-tooth driver with a 16-tooth driven gear gives a 2:1 reduction. Select the combination from the available 8–18 tooth models that achieves your target ratio within the compact Module 0.5 format.
Measure your motor or shaft diameter with a caliper before ordering. The bore options range from Ø0.5 mm to Ø5 mm. The bore must match your shaft diameter closely — a loose fit will cause slippage under load. If your shaft is between listed sizes, contact us to confirm the best fit.
Yes. Module 0.5 is a standardized gear metric, so these plastic spur gears will mesh correctly with any other Mod 0.5 gear — plastic or metal — as long as the pressure angle matches (typically 20°). However, pairing plastic gears with metal gears under heavy load may accelerate wear on the plastic gear.
These gears are designed for low-torque, low-to-medium speed applications such as toy motors, small robots, and educational projects. They are not rated for heavy industrial loads. For applications requiring higher torque capacity, consider metal module 0.5 gears instead. Exact load ratings depend on operating speed and temperature.
Yes. Plastic gears do not rust and are generally resistant to moisture and mild chemicals, making them suitable for indoor hobby and robotics environments. They are not recommended for prolonged exposure to harsh solvents or extreme temperatures that could degrade the plastic material.
The "Lengthen" variant (e.g., 132A-13 Teeth / Bore Ø3mm Lengthen) features an extended hub or face width compared to the standard version of the same tooth count and bore. This provides a longer engagement surface, which can improve stability on the shaft in applications where axial retention is important.
These plastic spur gears are best suited for indoor, room-temperature applications. Prolonged exposure to direct sunlight, temperatures above approximately 80°C (176°F), or harsh UV environments may cause dimensional changes or reduced strength. For outdoor or high-temperature use, metal module 0.5 gears are recommended.
