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When your CNC router, robotics platform, or automation drive train demands smooth, low-noise power transmission, a poorly matched pinion gear becomes the weakest link. Engineers and makers who need reliable helical engagement — without the backlash and vibration of spur gears — rely on module 1.5 brass helical gears to keep motion systems running true.
These brass helical gears feature a 45° left-hand helix angle and are available in 10, 13, and 15 tooth counts. Bore sizes range from 8 mm (0.31 in) to 15 mm (0.59 in), with keyway options (4 mm or 5 mm) available on larger bores for positive shaft locking. Gear face width is typically 10–20 mm depending on tooth count, and overall diameter scales with module and tooth count per standard gear geometry.
Typical use cases include motor pinion drives on stepper and servo motors in CNC milling machines, helical rack-and-pinion linear actuators, and compact gearbox stages in robotics joints where quiet, efficient torque transfer is essential.
Engineered for smooth, progressive tooth engagement that reduces noise and vibration compared to straight-cut spur gears — ideal for continuous-duty motor pinion applications.
Brass offers a favorable combination of machinability, moderate strength, and natural corrosion resistance — well-suited for indoor automation, light CNC, and instrument drives.
Three tooth count options let you dial in the gear ratio you need for your motor pinion stage without custom machining.
Bore sizes from 8 mm to 15 mm accommodate common motor shaft diameters. Keyway variants (4 mm or 5 mm) provide positive torque transmission without relying solely on set screws.
Order 1 to 5 pieces per SKU to match your project build quantity — useful for paired gear sets, spare parts stocking, or small-batch production runs.
Manufactured to Module 1.5 gear standards for predictable pitch diameter, tooth profile, and mesh compatibility with other M1.5 helical components in your drivetrain.
| Module | 1.5 |
|---|---|
| Helix Angle | 45° |
| Hand | Left-hand |
| Tooth Count | 10 / 13 / 15 Tooth (see variant options) |
| Material | Brass |
| Bore Diameter | 8 mm / 10 mm / 12 mm / 14 mm / 15 mm (see variant options) |
| Keyway | 4 mm (for 10–12 mm bore) / 5 mm (for 14–15 mm bore) / None (8–10 mm plain bore) |
| Face Width | See variant options |
| Pitch Diameter | See variant options |
| Pressure Angle | 20° (standard) |
| Finish | Natural brass |
| Application | Motor pinion, CNC drive, robotics, automation |
| Quantity per Order | 1 / 2 / 3 / 4 / 5 pcs (see variant options) |
The tooth count determines your gear ratio when paired with a mating gear or rack. A 10-tooth pinion gives a higher reduction ratio (faster speed reduction, more torque multiplication) than a 15-tooth pinion at the same module. Match your tooth count to the gear ratio your motor and load require. If you are unsure, calculate: ratio = driven teeth ÷ driving teeth.
Measure your motor shaft diameter precisely with calipers. Select the bore that matches your shaft — for example, an 8 mm shaft needs the 8 mm bore variant. If your shaft has a keyway, choose a bore variant that includes a matching keyway (4 mm keyway for 10–12 mm bores, 5 mm keyway for 14–15 mm bores) to ensure positive torque transmission.
No. For two helical gears to mesh on parallel shafts, they must have opposite helix hands — one left-hand and one right-hand. These gears are left-hand, so they must be paired with a right-hand Module 1.5 helical gear or rack. Using two gears of the same hand on parallel shafts will not produce proper mesh.
Brass has lower tensile strength than steel but offers better machinability, natural corrosion resistance, and quieter operation due to its damping properties. Brass gears are well-suited for light-to-medium duty applications such as instrument drives, light CNC, and robotics. For heavy-load or high-cycle industrial applications, steel or hardened steel gears are typically recommended.
Yes. Brass naturally resists oxidation and mild corrosion in typical indoor environments, making it suitable for automation equipment, laboratory instruments, and light machinery. It is not recommended for prolonged exposure to saltwater, strong acids, or highly humid outdoor environments without additional protective coating.
A plain bore relies on a set screw or press fit to secure the gear to the shaft. A keyway bore includes a rectangular slot that accepts a matching key inserted between the shaft and gear, providing a positive mechanical lock that prevents rotational slipping under torque. Keyway variants are recommended for higher-torque or reversing-load applications.
Yes. Each variant listing includes quantity options of 1, 2, 3, 4, or 5 pieces. Select the quantity that matches your build requirement — useful for paired gear sets, redundancy spares, or small production batches.
