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When your build demands tight gear mesh, minimal backlash, and reliable torque transfer in a compact footprint, a poorly spec'd gear becomes the weakest link. Hobbyists, robotics engineers, and prototype makers who work with 0.5 module drive trains need a pinion spur gear that holds dimensional tolerances under repeated cycling — not one that wears out after a few hours of run time.
This 0.5 Mod Brass Pinion Spur Gear features 46 teeth machined from solid brass stock, delivering a pitch diameter of approximately 23 mm (0.91 in). Bore options span 4 mm, 5 mm, 6 mm, 8 mm, 10 mm, and 12 mm (approx. 0.16–0.47 in), covering the most common shaft diameters used in compact gearboxes. Overall gear width is typically 5–8 mm (0.20–0.31 in) depending on variant.
Typical applications include RC car transmission stages requiring a 0.5 mod 46-tooth spur gear replacement, small robotic joint actuators pairing this pinion with a matching rack or ring gear, and DIY CNC or 3D-printer extruder drives where a brass spur gear resists wear better than plastic alternatives.
Machined from brass alloy for inherent corrosion resistance, self-lubricating properties, and a strength-to-weight ratio suited to compact drive applications.
Standard involute tooth form ensures smooth mesh with any 0.5 mod counterpart gear, minimizing noise and vibration in high-cycle applications.
Choose from 4 mm, 5 mm, 6 mm, 8 mm, 10 mm, or 12 mm bore to match your shaft without custom machining or adapters.
~23 mm pitch diameter keeps the gear envelope small, making it ideal for space-constrained gearboxes in robotics, RC vehicles, and precision instruments.
Available in 1, 2, or 5-piece packs — stock spares for maintenance or build multiple identical drive stages without reordering.
Brass outperforms plastic gears in continuous-duty cycles and resists galling against steel shafts, extending service intervals in demanding builds.
| Module | 0.5 |
|---|---|
| Number of Teeth | 46 |
| Pitch Diameter | 23 mm (0.91 in) |
| Material | Brass |
| Bore Diameter | 4 / 5 / 6 / 8 / 10 / 12 mm — See variant options |
| Gear Width (Face Width) | Typically 5–8 mm (0.20–0.31 in) |
| Pressure Angle | 20° |
| Tooth Profile | Standard Involute |
| Finish | Natural brass (uncoated) |
| Packing Quantity | 1 PCS / 2 PCS / 5 PCS — See variant options |
| Weight (per piece) | Typically 8–18 g (0.28–0.63 oz) depending on bore |
Measure your shaft's outer diameter with calipers and select the matching bore. Available options are 4 mm, 5 mm, 6 mm, 8 mm, 10 mm, and 12 mm. A bore that matches your shaft exactly (with a light interference or keyed fit) will prevent slippage under load. If your shaft falls between sizes, consult your design tolerances or use a set-screw collar.
Yes. This gear uses a standard 0.5 module involute tooth profile with a 20° pressure angle, which is compatible with any other 0.5 mod spur gear, rack, or pinion of the same module. Confirm the mating gear's module before ordering to ensure proper mesh.
Brass is well-suited for light-to-medium duty transmission applications — RC vehicles, robotics joints, instrument drives, and prototype gearboxes. It offers better wear resistance than nylon or acetal and resists galling against steel shafts. For heavy industrial loads or shock-load environments, consider a steel gear instead.
Brass has inherent corrosion resistance and will not rust. It also has mild self-lubricating properties, though applying a light machine oil or grease to the tooth faces will extend service life and reduce noise, especially in continuous-duty applications.
Yes. A 0.5 mod 46-tooth brass spur gear is commonly used in extruder drives, axis transmission stages, and pen plotters where dimensional accuracy and wear resistance matter. Verify that your existing drive system uses 0.5 module gearing before substituting.
Multi-packs (2 PCS or 5 PCS) offer a lower per-unit cost and ensure you have spares on hand for maintenance or parallel builds. If you are building multiple identical drive stages — such as a multi-axis robot or a fleet of RC vehicles — ordering a 5-pack reduces downtime and reorder frequency.
The pitch diameter of this gear is 23 mm (Module × Teeth = 0.5 × 46). Gear ratio is determined by dividing the driven gear's tooth count by the driving gear's tooth count. Pairing this 46T gear with a smaller pinion (e.g., 10T) yields a 4.6:1 reduction ratio, useful for torque multiplication in slow-speed actuators.
