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When a worn or undersized gear introduces slop into your drivetrain, every downstream axis pays the price. Makers, RC builders, and automation engineers who need a dependable 0.5 module spur gear with a 35-tooth count will find this brass pinion gear machined for consistent mesh, low backlash, and long service life across a wide range of shaft diameters — from compact 4 mm motor shafts up to robust 12 mm drive shafts.
Each gear is turned from solid brass stock, delivering a practical balance of machinability, corrosion resistance, and moderate load capacity suited to light-to-medium duty 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) through 12 mm (0.472 in), including a 6.35 mm (0.250 in / ¼ in) option for imperial shaft compatibility. At 35 teeth with Mod 0.5, the outer diameter is approximately 18.5 mm (0.73 in).
Typical use cases include RC truck and crawler gearbox rebuilds requiring a 0.5 mod 35-tooth pinion gear replacement, multi-axis robotic arm joints where a brass transmission gear reduces audible noise versus steel, and DIY CNC or pen-plotter builds that pair this 35T spur gear with a matching rack or smaller motor pinion to achieve precise, repeatable motion.
| Module (Mod) | 0.5 |
|---|---|
| Number of Teeth | 35T |
| Outer Diameter (OD) | Approx. 18.5 mm (0.73 in) |
| Bore Diameter Options | 4 / 5 / 6 / 6.35 / 7 / 8 / 10 / 12 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 15–40 g depending on bore |
Measure your shaft diameter with a caliper and select the matching bore: 4, 5, 6, 6.35, 7, 8, 10, or 12 mm. A bore that is too large causes runout and vibration; one that is too small cannot be mounted without machining. If your shaft is imperial ¼ in (6.35 mm), select the 6.35 mm bore variant. For 10 mm and 12 mm shafts — common on NEMA 23 stepper motors and mid-size servo motors — choose those respective bore options.
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. Always 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 0.5–0.8 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, apply a light machine oil or grease to the tooth faces and bore to extend service life.
Center distance = (T1 + T2) × Module / 2. For this 35T gear meshing with a 15T pinion: (35 + 15) × 0.5 / 2 = 12.5 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 radially into the hub is the most common method. Alternatively, a light interference press-fit or retaining compound (e.g., Loctite 638) can be used for permanent installation. For larger bores (10–12 mm), verify hub wall thickness is sufficient before tapping a set screw hole.
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 suits classroom kits, recurring builds, or workshop stocking.
