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When a stripped plastic gear or an imprecise drive ratio derails your build, you need a metal replacement you can trust. The 0.5 Mod Brass Pinion Spur Gear 48 Teeth is engineered for hobbyists, robotics builders, and mechanical engineers who demand repeatable accuracy in compact power-transmission assemblies.
Each gear is machined from solid brass, offering a balance of machinability, corrosion resistance, and low-friction meshing. The module (Mod) is 0.5, with 48 teeth and a pitch diameter of approximately 24 mm (0.94 in). Bore options span 4 mm, 5 mm, 6 mm, 8 mm, 10 mm, and 12 mm (approx. 0.16–0.47 in) to fit a wide range of motor shafts and axles. Gear face width is typically 5–8 mm (0.20–0.31 in).
Typical use cases include RC car and truck drivetrain upgrades requiring a durable 0.5 mod spur gear replacement, small robotic arm joint drives needing a brass pinion gear with precise tooth count, and DIY clock or automaton mechanisms where a 48-tooth transmission gear delivers the correct reduction ratio.
Machined from brass for excellent corrosion resistance, smooth meshing, and longer service life compared to plastic alternatives in compact drive trains.
Standardized 0.5 Mod tooth profile ensures accurate meshing with any compatible Mod 0.5 gear, rack, or pinion in your drivetrain assembly.
Choose from 4 mm, 5 mm, 6 mm, 8 mm, 10 mm, or 12 mm bore diameters to match your motor shaft or axle without additional machining.
Available in 1 PCS, 2 PCS, or 5 PCS packs — order a single replacement or stock up for prototyping and production runs at a lower per-unit cost.
Brass's natural lubricity reduces friction and heat build-up during continuous operation, making these gears well-suited for motorized and servo-driven mechanisms.
Suitable for RC vehicles, robotics joints, 3D printer extruder drives, clock mechanisms, and any compact 0.5 mod spur gear transmission requiring a reliable 48-tooth pinion.
| Module (Mod) | 0.5 |
|---|---|
| Number of Teeth | 48T |
| Pitch Diameter | 24 mm (0.94 in) |
| Bore Diameter | 4 / 5 / 6 / 8 / 10 / 12 mm — See variant options |
| Material | Brass |
| Face Width | Typically 5–8 mm (0.20–0.31 in) |
| Pressure Angle | 20° |
| Gear Type | Spur (Pinion) |
| Finish | Natural brass (uncoated) |
| Pack Quantity | 1 PCS / 2 PCS / 5 PCS — See variant options |
| Weight (per piece) | Contact us to confirm |
Measure your motor or axle shaft diameter with a caliper. Select the bore size that matches exactly — for example, a 5 mm motor shaft requires the Bore 5 mm variant. If your shaft is slightly undersized, a set-screw hub or shaft collar can compensate, but a precise bore match is always recommended for concentricity.
Yes. Any gear or rack with a Module of 0.5 and a 20° pressure angle will mesh correctly with this 48-tooth spur gear. Confirm the module and pressure angle of your mating gear before ordering to ensure compatibility.
Brass offers a good balance of strength, machinability, and corrosion resistance for light-to-medium load applications such as RC cars, small robots, and servo-driven mechanisms. For very high-torque or impact-heavy applications, consider steel gears. For most hobbyist and maker builds, brass is a reliable and long-lasting choice.
Brass does not rust (it contains no iron), and it has inherent corrosion resistance in most environments. In humid or outdoor conditions, brass may develop a natural patina over time, which does not affect mechanical performance. No special coating or treatment is required for typical indoor use.
With Module 0.5 and 48 teeth, the pitch diameter is 24 mm (0.94 in). Gear ratio is determined by the tooth count of the mating gear divided by 48. For example, pairing this gear with a 12-tooth pinion gives a 4:1 reduction ratio. Use this to calculate the output speed and torque for your specific application.
Light lubrication with a gear grease or white lithium grease is recommended for continuous-duty or high-speed applications to reduce wear and noise. For intermittent or low-speed use, brass's natural lubricity is often sufficient without additional lubricant. Avoid petroleum-based oils that may attract dust and debris.
You can purchase as few as 1 PCS. Pack options of 2 PCS and 5 PCS are also available at a lower per-unit cost, which is useful for prototyping, spares inventory, or multi-axis builds requiring identical gears.
