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When a loose or undersized pinion gear causes slippage, noise, or premature wear in your build, the entire drivetrain suffers. Hobbyists, robotics engineers, and small-machine builders who need a dimensionally consistent, metal-bodied spur gear for tight-tolerance assemblies will find this 0.5 mod brass pinion spur gear a dependable solution.
Each gear is machined from solid brass, offering a balance of machinability, corrosion resistance, and moderate strength. The 26-tooth profile follows the 0.5 module standard, with an outer diameter of approximately 14 mm (0.55 in) and bore options spanning 4 mm to 7 mm (0.157 in to 0.276 in), including a 6.35 mm (1/4 in) option for imperial shaft compatibility.
Typical applications include RC car transmission pinion replacement, small servo-driven robotic joints requiring a 0.5 mod spur gear for motor shaft coupling, and compact gearbox assemblies in 3D-printed or CNC-machined enclosures where a brass pinion gear with precise tooth count is required for accurate gear ratio calculation.
Machined from brass for corrosion resistance, smooth meshing, and long service life in indoor and light-duty outdoor applications.
26-tooth, 0.5 mod profile ensures accurate gear ratio pairing with any standard 0.5 module mating gear or rack.
Available in 4 mm, 5 mm, 6 mm, 6.35 mm (1/4 in), and 7 mm bores to fit a wide range of motor and drive shafts without adapters.
Small outer diameter (~14 mm) and low mass make these gears suitable for weight-sensitive builds such as micro robotics and RC drivetrains.
Order as 1, 2, 5, or 10 pieces to match prototyping needs or production runs without overstocking.
Uniform tooth pitch and profile depth across all bore variants ensures repeatable mesh quality when swapping shafts or replacing worn gears.
| Module | 0.5 |
|---|---|
| Number of Teeth | 26 |
| Material | Brass |
| Outer Diameter | Approx. 14 mm (0.55 in) |
| Bore Diameter | 4 / 5 / 6 / 6.35 / 7 mm — See variant options |
| Gear Type | Spur (Pinion) |
| Pressure Angle | 20° |
| Hub / Face Width | See variant options |
| Finish | Natural brass (uncoated) |
| Packing Quantity | 1 / 2 / 5 / 10 PCS — See variant options |
Measure your motor or drive shaft diameter with a caliper. Select the bore option that matches exactly — for example, choose the 6.35 mm bore if your shaft is 1/4 inch. A bore that is too large will cause runout and slippage; a bore that is too small cannot be pressed on without machining.
Brass spur gears are well-suited for low-to-medium torque applications such as RC cars, servo-driven robots, and small gearboxes. For high-torque or high-speed industrial drives, consider steel alternatives. Brass offers quieter operation and better corrosion resistance than mild steel in comparable sizes.
Brass naturally develops a patina in humid environments but does not rust. For applications exposed to moisture, a light coating of machine oil on the tooth faces will slow tarnishing and maintain smooth mesh. The gear is not plated, so the natural brass surface is the working surface.
This gear is 0.5 module. It must only mesh with other 0.5 module gears — mixing modules (e.g., pairing with a 0.8 mod gear) will result in incorrect tooth engagement, noise, and rapid wear. Confirm the module of your existing gearset before ordering.
Yes. The 6.35 mm bore variant is sized for a standard 1/4-inch shaft. This makes it compatible with many North American hobby motors and servo output shafts that use imperial dimensions.
For initial prototyping, the 1 or 2 PCS option lets you validate fit and gear ratio before committing. For small production runs or to keep spares on hand, the 5 or 10 PCS packs offer a lower per-unit cost. Select your quantity in the variant options above.
