Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.
When a stripped plastic gear or an imprecise bore fit derails your build, the fix demands metal. Hobbyists, robotics engineers, and RC enthusiasts who need a dependable 0.5 module spur gear with a 30-tooth count will find this brass pinion gear engineered for consistent mesh, low backlash, and long service life in tight-tolerance assemblies.
Each gear is machined from solid brass stock, offering a balance of machinability, corrosion resistance, and moderate strength suited to light-to-medium load transmission. The 0.5 module (Mod 0.5) tooth profile conforms to standard DIN/ISO gear geometry. Bore options span 4 mm (0.157 in) to 8 mm (0.315 in), with an intermediate 6.35 mm (0.250 in / ¼ in) option for imperial shaft compatibility. Overall gear outer diameter is approximately 16 mm (0.63 in) at 30 teeth with 0.5 module.
Typical use cases include RC car and truck gearbox rebuilds requiring a 0.5 mod pinion gear replacement, small robotic arm joint drives where a brass transmission gear reduces noise versus steel, and DIY automation projects such as motorized camera sliders or pen plotters that rely on precise 30-tooth spur gear meshing with a matching rack or wheel gear.
| Module (Mod) | 0.5 |
|---|---|
| Number of Teeth | 30T |
| Outer Diameter (OD) | Approx. 16 mm (0.63 in) |
| Bore Diameter Options | 4 mm / 5 mm / 6 mm / 6.35 mm / 7 mm / 8 mm |
| Material | Brass |
| Tooth Profile Standard | DIN / ISO Mod 0.5 |
| Pressure Angle | 20° (standard) |
| Hub / Face Width | See variant options |
| Finish | Natural brass (uncoated) |
| Pack Quantity | 1 / 2 / 5 / 10 PCS (select above) |
| Approximate Weight (per piece) | Typically 10–30 g depending on bore |
Measure your motor or drive shaft diameter with a caliper. Select the bore that matches exactly — 4 mm, 5 mm, 6 mm, 6.35 mm (¼ in), 7 mm, or 8 mm. A bore that is too large will cause runout and vibration; a bore that is too small cannot be pressed on without machining. If your shaft is imperial ¼ in (6.35 mm), select the 6.35 mm bore variant.
The mating gear must also be 0.5 module (Mod 0.5). Module is not interchangeable — a Mod 0.8 or Mod 1.0 gear will not mesh correctly and will cause rapid wear or binding. Confirm the module of your existing gearset before ordering.
Brass is well-suited for light-to-medium torque applications such as RC vehicles, small robots, camera rigs, and pen plotters. It offers better wear resistance than plastic and runs quietly. For high-torque or high-speed industrial drives, consider steel gears instead. If your motor stall torque exceeds approximately 0.5 N·m at this gear size, evaluate whether brass meets your load requirements.
Brass has inherent corrosion resistance and will not rust like steel. In outdoor or humid environments it may develop a patina over time, which does not significantly affect function. For salt-spray or submerged environments, consider applying a light machine oil or grease to the tooth faces and bore.
Center distance = (T1 + T2) × Module / 2. For this 30T gear meshing with, for example, a 10T pinion: (30 + 10) × 0.5 / 2 = 10 mm. Substitute your mating gear's tooth count to calculate the exact center distance for your design.
The bore is machined to a close sliding fit. For secure shaft retention, a set screw (grub screw) tapped into the hub is the most common method for this gear size — drill and tap a radial hole in the hub if not pre-drilled. Alternatively, a light interference press-fit or retaining compound (e.g., Loctite 638) can be used for permanent installation. Check the hub wall thickness against your bore size before tapping.
Order 1 PCS for a single repair or prototype. Choose 2 PCS if you have two axes or want a spare on hand. Select 5 PCS for multi-axis robots or small production batches. The 10 PCS pack offers the lowest per-unit cost and is ideal for classroom kits, recurring builds, or stocking a workshop.
