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When a stripped or undersized gear brings your build to a halt, finding an exact-spec replacement fast is everything. Whether you are a robotics hobbyist, RC vehicle builder, or small-machine engineer, this 15-tooth flat plastic spur gear delivers consistent mesh engagement and smooth torque transfer in compact drive trains.
This pinion motor gear is molded from engineering-grade blue plastic (ABS-type), offering a balance of light weight and adequate rigidity for low-to-medium load applications. Available in two bore sizes — 2.3 mm (~0.091 in) and 3.17 mm (~0.125 in, 1/8 in) — with a module pitch of 2.3 mm or 3.17 mm respectively. The flat gear profile suits standard spur-gear mesh configurations without requiring a hub or set-screw collar.
Typical use cases include: replacement pinion gears for hobby-grade RC car motor shafts, drive gears in small robotic arm joints requiring a 15-tooth count, and stage-one reduction gears in DIY conveyor or actuator projects where a lightweight plastic gear reduces system inertia.
The vivid blue finish makes it easy to identify gear size and module at a glance during assembly or maintenance, reducing mis-installation risk in multi-gear drive trains.
A 15-tooth count provides a useful reduction ratio when paired with larger driven gears, suitable for motor pinion applications in RC, robotics, and small automation builds.
Choose the bore that matches your motor shaft — 2.3 mm for smaller hobby motors or 3.17 mm (1/8 in) for standard RC and robotics motors — ensuring a snug, wobble-free fit.
Molded from rigid ABS-type plastic, these gears keep rotating mass low, which is critical for responsive acceleration in RC drivetrains and fast-cycle robotic joints.
Order a single gear for a quick repair or up to 500 pieces for production runs and workshop stock — quantity pricing scales to keep per-unit cost efficient at volume.
Flat gear face and standard module pitch allow direct substitution for OEM pinion gears in many hobby-grade platforms without modification to the motor mount or gear housing.
| Tooth Count | 15 teeth |
|---|---|
| Bore / Shaft Diameter | 2.3 mm (≈0.091 in) or 3.17 mm (≈0.125 in / 1/8 in) — see variant options |
| Module | See variant options |
| Gear Type | Flat spur gear (pinion) |
| Material | Engineering plastic (ABS-type) |
| Color | Blue |
| Gear Face Width | See variant options |
| Outer Diameter | See variant options |
| Hub / Set Screw | No hub; press-fit or friction-fit bore |
| Available Quantities | 1, 5, 10, 20, 50, 100, 200, 300, 400, 500 pcs |
Measure your motor output shaft diameter with a caliper. If it measures approximately 2.3 mm, select the 2.3 mm variant. If it measures approximately 3.17 mm (1/8 inch), select the 3.17 mm variant. A loose bore will cause gear slip and premature wear, so always verify before ordering.
Yes — module pitch must match between meshing gears for correct tooth engagement. The module corresponds to the bore variant selected. Check your mating gear's module specification and confirm it matches before purchasing. Mismatched modules will result in poor mesh, noise, and rapid wear.
These plastic spur gears are suited for low-to-medium torque applications typical of hobby RC vehicles, small robotic joints, and light automation. They are not recommended for high-torque or high-impact applications where metal gears would be required. For most hobby-grade motors running at standard voltages, they perform reliably.
Engineering plastic (ABS-type) does not rust and has good resistance to incidental moisture exposure. However, prolonged submersion or exposure to harsh chemicals or UV radiation may cause degradation over time. For outdoor or wet environments, consider applying a light protective coating or selecting a more chemically resistant material.
These gears use a press-fit or friction-fit bore and do not include a set screw or hub collar. For applications with significant axial or rotational load, you may wish to use a small drop of thread-locking adhesive or a shaft collar to prevent slippage. For light-duty hobby use, a snug press fit is typically sufficient.
In many cases, yes — provided the tooth count (15T), bore diameter, and module pitch match your original pinion gear. Always cross-reference these three specifications against your vehicle's parts list or measure the original gear before ordering. The flat spur profile is compatible with most standard spur-gear motor mounts.
For single repairs or prototyping, the 1 or 5 pcs options are ideal. For workshop stock or small production runs, the 50–200 pcs tiers offer better per-unit value. For larger manufacturing or bulk assembly needs, the 300–500 pcs options provide the most cost-efficient pricing. Select your quantity above to see the corresponding price.
