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When backlash, noise, and misalignment cost you accuracy, engineers and makers building CNC routers, robotic arms, and motor-driven assemblies need a gear they can rely on. These Module 1.5 left-hand helical gears are designed for motion-control builders who demand smooth, quiet power transmission without compromise.
Each gear is machined from stainless steel, offering corrosion resistance and structural rigidity across the full range. Available in 10, 13, and 15 tooth counts with a 45° left-hand helix angle. Bore sizes range from 8 mm (0.31 in) to 15 mm (0.59 in), with keyway options (4 mm and 5 mm) available on select bore sizes for positive shaft engagement.
Typical applications include motor pinion drives in CNC gantry systems, paired left-right helical gear sets for zero-axial-thrust configurations, and compact reduction stages in robotics and automation equipment where quiet operation and precise tooth engagement are critical.
Standardized Mod 1.5 pitch ensures direct interchangeability with matching helical gear sets and simplifies gear ratio calculations for your drivetrain.
The 45° left-hand helix delivers smooth, progressive tooth engagement that reduces vibration and noise compared to spur gears — ideal for paired helical configurations.
Machined from stainless steel for corrosion resistance in humid, washdown, or outdoor environments where carbon steel gears would degrade over time.
Choose from 8 mm plain bore, 10 mm plain bore, or keyway-equipped bores (10 mm + 4 mm, 12 mm + 4 mm, 14 mm + 5 mm, 15 mm + 5 mm) to match your shaft and torque requirements.
Compact 10, 13, and 15 tooth counts are sized for direct motor shaft mounting, making these gears a natural fit for stepper and servo motor pinion stages in CNC and robotics builds.
Keyway bore variants eliminate shaft slip under load, providing a mechanically positive connection that set-screw-only bores cannot match in high-cycle or high-torque applications.
| Module | 1.5 |
|---|---|
| Helix Angle | 45° |
| Hand | Left-hand |
| Tooth Count Options | 10T / 13T / 15T |
| Bore Size Options | 8 mm, 10 mm, 10 mm + 4 mm Keyway, 12 mm + 4 mm Keyway, 14 mm + 5 mm Keyway, 15 mm + 5 mm Keyway |
| Material | Stainless Steel |
| Pitch Diameter (10T) | 15 mm (0.59 in) |
| Pitch Diameter (13T) | 19.5 mm (0.77 in) |
| Pitch Diameter (15T) | 22.5 mm (0.89 in) |
| Face Width | See variant options |
| Hub Diameter | See variant options |
| Pressure Angle | 20° (standard) |
| Finish | Natural stainless (uncoated) |
| Quantity per Order | 1 pcs |
Tooth count determines your gear ratio and pitch diameter. The 10-tooth pinion gives the highest reduction ratio when paired with a larger driven gear, making it suitable for high-torque, lower-speed motor outputs. The 13T and 15T options reduce the ratio and increase pitch diameter, which can improve load distribution. Calculate your required ratio first, then select the tooth count that achieves it with your chosen mating gear.
For light-duty or low-cycle applications, a plain bore secured with a set screw is often sufficient. For motor pinion use — especially with stepper or servo motors running continuous cycles or reversing loads — a keyway bore provides a mechanically positive connection that prevents rotational slip under torque spikes. If your shaft has a keyway machined in, always match it with a keyway bore gear.
Left-hand and right-hand refer to the direction the teeth spiral around the gear. To mesh correctly, a left-hand gear must pair with a right-hand gear on parallel shafts. These gears are left-hand (LH); ensure your mating gear is right-hand (RH) with the same module (1.5) and helix angle (45°) for proper engagement.
Yes. Stainless steel provides good corrosion resistance in humid, lightly wet, and outdoor environments. For continuous immersion or exposure to aggressive chemicals, verify the specific stainless grade is compatible with your environment. The natural uncoated finish requires no additional treatment for typical workshop or light industrial use.
No. Helical gears with a 45° helix angle cannot mesh with spur gears (0° helix). They must be paired with a Module 1.5 helical gear of the same helix angle and opposite hand. Mixing helical and spur gears of the same module will result in incorrect tooth contact and rapid wear.
Measure your motor shaft diameter with a caliper. Select the bore size that matches — for example, an 8 mm shaft takes the 8 mm bore, a 10 mm shaft takes the 10 mm or 10 mm + 4 mm keyway bore. If your shaft has a keyway, measure the keyway width (typically 3–5 mm) and select the matching keyway bore option. Contact us to confirm if you are unsure.
Yes. Pairing a left-hand helical gear with a right-hand helical gear of the same module, tooth count, and helix angle on parallel shafts produces opposing axial thrust forces that cancel each other out — a common technique in precision gearboxes to eliminate net axial load on bearings. Ensure both gears are the same tooth count and module for a 1:1 ratio, or select different tooth counts for a reduction stage.
