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When a loose or mismatched pinion gear causes slippage, noise, or premature wear in your drive train, the root cause is almost always a gear that wasn't machined to spec. Hobbyists, robotics engineers, and small-machine builders who demand repeatable, low-backlash motion need a spur gear they can rely on across every build.
This 0.5 module brass spur gear features 36 teeth and is available in bore diameters from 4 mm (~0.157 in) to 12 mm (~0.472 in), including the common 6.35 mm (1/4 in) imperial shaft size. The gear body is machined from solid brass, offering a combination of machinability, corrosion resistance, and moderate load capacity. Outer diameter is approximately 18.5 mm (~0.728 in) based on the standard 0.5 mod formula (OD = (T + 2) × module), and face width is typically 5–8 mm depending on the variant.
Typical use cases include RC car transmission pinion replacement, small DC motor output stages in robotics arms, and compact conveyor or indexing mechanisms where a 0.5 mod 36-tooth spur gear for motor shaft coupling is required. The brass construction also makes it a reliable choice for low-speed, high-torque applications where steel gears would be overkill.
Machined to standard 0.5 mod tooth geometry for accurate meshing with any compatible 0.5 mod gear, rack, or worm in your drivetrain.
Brass offers natural corrosion resistance, self-lubricating properties under light loads, and easy re-boring or knurling if shaft fit needs adjustment.
Covers the most common motor shaft diameters including the 6.35 mm (1/4") imperial standard, reducing the need for custom adapters or bushings.
Consistent tooth spacing and bore concentricity keep backlash minimal, which matters in servo-driven or stepper-motor positioning systems.
Available in 1, 2, 5, or 10-piece packs so you can stock spares for production runs or prototype iterations without over-ordering.
Designed as a drop-in pinion gear for motor output shafts in RC vehicles, robotics, and small automation equipment using 0.5 mod gear trains.
| Module | 0.5 |
|---|---|
| Number of Teeth | 36T |
| Pitch Diameter | 18 mm (0.709 in) |
| Outer Diameter (approx.) | ~18.5 mm (~0.728 in) |
| Bore Diameter | 4 / 5 / 6 / 6.35 / 7 / 8 / 10 / 12 mm (see variant options) |
| Face Width | See variant options |
| Pressure Angle | 20° |
| Material | Brass |
| Finish | Natural brass (uncoated) |
| Gear Type | Spur (straight tooth) |
| Hub Style | See variant options |
| Pack Quantity | 1 / 2 / 5 / 10 PCS (see variant options) |
Measure your motor or drive shaft diameter with a caliper. Match it to the closest bore option: 4, 5, 6, 6.35 (1/4"), 7, 8, 10, or 12 mm. If your shaft is slightly undersized, a set screw or loctite can secure the fit. If oversized, the gear cannot be used without re-boring.
Brass spur gears at 0.5 module are suited for light-to-moderate loads — typically small DC motors, servo outputs, and stepper-driven mechanisms under 5 Nm. For heavy-duty or high-RPM industrial applications, a steel gear of the same module would be more appropriate.
Brass has good natural corrosion resistance and will not rust like steel. It is suitable for moderately humid environments. For saltwater or highly corrosive conditions, consider stainless steel or nylon alternatives. Applying a light machine oil will extend service life in any environment.
Yes. Module is a universal standard — any 0.5 mod gear meshes with any other 0.5 mod gear regardless of material, as long as the pressure angle (20°) matches. Confirm the pressure angle of your existing gear train before ordering.
Yes. This 36T 0.5 mod brass spur gear is commonly used as a motor pinion replacement in RC vehicles and robotics platforms. Verify that your existing gear train uses 0.5 module and that the bore matches your motor shaft diameter.
Gears in high-cycle applications wear over time. Keeping 2–10 spares on hand means zero downtime when a gear needs replacement during a project or production run. Multi-packs also reduce per-unit cost for prototyping or small-batch manufacturing.
Pitch diameter (PD) is the theoretical meshing circle: PD = Teeth × Module = 36 × 0.5 = 18 mm. Outer diameter (OD) adds one full tooth height on each side: OD = (Teeth + 2) × Module ≈ 18.5 mm. Use pitch diameter for center-distance calculations between mating gears.
