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When a standard spur gear creates too much noise or axial load is a concern, engineers and makers turn to helical gears for smoother, quieter power transmission. This Module 1 helical gear is designed for hobbyists, robotics builders, CNC enthusiasts, and mechanical engineers who need a reliable left-hand 45° helix angle pinion for motor output shafts and compact drive trains.
Each gear is machined from stainless steel, offering solid corrosion resistance and structural integrity for demanding environments. The module is 1 (metric), with tooth counts of 13, 15, or 20 teeth, and bore sizes ranging from 6 mm (0.24 in) to 16 mm (0.63 in). Keyway bore options (4 mm and 5 mm keyway) are available for positive shaft locking. Overall gear diameter typically ranges from approximately 15 mm (0.59 in) for the 13-tooth variant to approximately 22 mm (0.87 in) for the 20-tooth variant.
Typical use cases include DC motor pinion drives in robotics and automation rigs, compact gearbox assemblies in 3D printer extruder mechanisms, and light-duty CNC axis drives where helical engagement reduces backlash and vibration compared to straight-cut spur gears.
Machined from stainless steel for corrosion resistance and durability in humid or lightly wet environments, outperforming standard carbon steel gears in longevity.
The 45° helix angle delivers smooth, progressive tooth engagement that reduces noise and vibration — ideal for motor pinion applications where quiet operation matters.
Three tooth count options let you dial in the exact gear ratio needed for your drive system, from higher-speed 13-tooth pinions to torque-friendly 20-tooth configurations.
Bore sizes from 6 mm to 16 mm cover most motor shaft diameters. Keyway variants (4 mm and 5 mm) provide positive shaft engagement and prevent slippage under load.
Conforms to the Module 1 metric gear standard, ensuring straightforward meshing with any compatible Module 1 mating gear in your assembly.
Each gear is machined to consistent tolerances, reducing runout and ensuring repeatable performance across multiple units in multi-gear drive trains.
| Material | Stainless Steel |
|---|---|
| Module | 1 (Metric) |
| Helix Angle | 45° |
| Hand | Left-Hand |
| Tooth Count | 13 / 15 / 20 Teeth (see variant options) |
| Bore Size | 6 mm / 8 mm / 10 mm / 12 mm / 14 mm / 15 mm / 16 mm; Keyway: 10+4mm / 12+4mm / 14+5mm / 15+5mm |
| Pitch Diameter (approx.) | 13T ≈ 13 mm | 15T ≈ 15 mm | 20T ≈ 20 mm |
| Outside Diameter (approx.) | 13T ≈ 15 mm | 15T ≈ 17 mm | 20T ≈ 22 mm |
| Face Width | See variant options |
| Pressure Angle | 20° (standard metric) |
| Gear Type | Helical Pinion Gear |
| Application | Motor pinion, robotics, CNC, automation drive systems |
| Quantity per Order | 1 pcs |
The tooth count determines your gear ratio. A 13-tooth pinion paired with a larger driven gear gives a higher reduction ratio (more torque, less speed). A 20-tooth pinion provides a lower reduction ratio (more speed, less torque). Match your tooth count to the driven gear size to achieve your target RPM and torque output.
Measure your motor shaft diameter precisely with calipers. Select the bore size that matches your shaft — for example, a 6 mm shaft requires the 6 mm bore variant. If your shaft uses a key for positive locking, choose a keyway bore option (e.g., 10 mm + 4 mm keyway). A bore that is too large will cause slippage; too small will not fit.
Stainless steel offers a good balance of strength and corrosion resistance for light-to-medium duty motor pinion applications, robotics, and automation. For very high-torque or heavy industrial applications, consider whether a hardened alloy steel gear would be more appropriate. These gears are well-suited for DC motor outputs, stepper motor drives, and similar precision motion applications.
Stainless steel provides solid corrosion resistance in humid and mildly wet conditions, making it suitable for outdoor robotics, marine-adjacent applications, and environments where carbon steel would rust. For prolonged immersion or highly corrosive chemical environments, additional protective measures may be needed.
This is a left-hand helix gear. It must be paired with a right-hand helix gear of the same module (Module 1) and the same helix angle (45°) for proper meshing on parallel shafts. Do not attempt to mesh it with spur gears, different module gears, or gears of a different helix angle — this will result in poor contact and rapid wear.
Yes. Module 1 helical gears are commonly used in 3D printer extruder drives and CNC axis gearboxes where smooth, low-noise transmission is important. Verify that your existing drive gear is also Module 1 with a matching 45° helix angle and opposite hand before ordering.
A plain bore relies on a set screw or press fit to secure the gear to the shaft. A keyway bore includes a machined slot that accepts a key (a small rectangular metal piece) inserted between the shaft and gear, providing a positive mechanical lock that prevents rotational slippage under load. Keyway options are recommended for higher-torque applications.
🛒 Select your tooth count, bore size, and quantity above, then add to cart.
