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When a stripped plastic gear or an imprecise mesh throws off your entire build, the frustration is real — especially for RC hobbyists, robotics engineers, and precision instrument makers who depend on tight tolerances. This 0.5 module brass pinion spur gear with 52 teeth is engineered for makers and professionals who need reliable, repeatable power transmission in compact mechanisms.
Each gear is machined from solid brass, offering a balance of machinability, corrosion resistance, and moderate strength. The module (Mod) is 0.5, with 52 teeth and a pitch diameter of approximately 26 mm (1.02 in). Bore options range from 4 mm to 12 mm (0.16 in – 0.47 in), covering the most common shaft diameters used in small-scale drive systems. Face width is typically 5–8 mm (0.20–0.31 in).
Typical use cases include RC car differential and drive train assemblies requiring a 0.5 mod spur gear replacement, compact robotic joint actuators where a brass 52-tooth transmission gear reduces backlash, and precision clock or instrument mechanisms that demand a low-noise metal spur gear with consistent tooth profile.
| Module (Mod) | 0.5 |
|---|---|
| Number of Teeth | 52T |
| Pitch Diameter | 26 mm (1.02 in) |
| Outside Diameter | Approx. 27 mm (1.06 in) |
| Bore Diameter | 4 / 5 / 6 / 8 / 10 / 12 mm (see variant options) |
| Face Width | Typically 5–8 mm (0.20–0.31 in) |
| Material | Brass |
| Tooth Profile | Standard metric involute, 20° pressure angle |
| Finish | Natural brass (uncoated) |
| Packing Quantity | 1 PCS / 2 PCS / 5 PCS (see variant options) |
| Compatible Module | 0.5 Mod gears only |
| Keyway / Set Screw | See variant options |
Measure your shaft diameter with a caliper. Select the bore that matches exactly — for example, a 6 mm shaft requires the Bore 6mm variant. A bore that is too large will cause shaft slippage; too small will not fit without machining. If your shaft is between listed sizes, choose the next smaller bore and ream to fit.
Yes. All 0.5 module gears — regardless of material — share the same tooth profile and pitch, so this brass spur gear will mesh correctly with any 0.5 mod plastic, aluminum, or steel pinion. Confirm the mating gear is also 0.5 mod before ordering.
Brass has lower tensile strength than steel (typically 300–500 MPa vs. 500–900 MPa for mild steel), making it suitable for light-to-moderate load applications such as RC cars, small robots, and instruments. For high-torque or high-speed industrial drives, a steel gear would be more appropriate. Brass excels where low noise, corrosion resistance, and ease of machining are priorities.
Brass offers good resistance to atmospheric corrosion and mild moisture. It is not recommended for prolonged immersion in water or exposure to strong acids. For outdoor or wet environments, consider applying a light machine oil to the tooth surfaces to extend service life.
This gear uses the standard 20° pressure angle, which is the most common metric involute tooth form. It is compatible with other standard 0.5 mod gears that also use a 20° pressure angle. Mixing gears with different pressure angles (e.g., 14.5°) will result in poor mesh and accelerated wear.
If you are replacing a single worn gear, the 1 PCS option is sufficient. For builds with multiple identical gear stages, or if you want a spare on hand, the 2 PCS pack offers better value. The 5 PCS pack is ideal for batch production, classroom projects, or stocking a workshop — the per-unit cost decreases with larger quantities.
Yes, for 1/24 to 1/18 scale RC cars that use 0.5 mod gearing, this brass spur gear is a common upgrade from stock plastic gears. Brass provides better durability under repeated load cycles. Ensure your motor pinion is also 0.5 mod and that the center distance between shafts is set correctly for proper mesh depth.
