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When backlash, noise, and axial load management matter in your motion system, a standard spur gear simply won't cut it. Engineers, CNC builders, and robotics integrators who demand smooth, quiet power transmission under continuous load rely on left-hand helical gears to deliver consistent performance across demanding duty cycles.
These left-hand helical gears are machined from stainless steel with a 45° helix angle, available in Module 1 and Module 1.5 configurations. Tooth counts range from 10 to 20 teeth, with bore sizes spanning 6 mm (0.24 in) to 16 mm (0.63 in). Select variants include a precision-cut keyway (4 mm or 5 mm) for positive torque transmission without set-screw slip.
Typical applications include CNC router motor pinion drives, robotic joint actuators requiring low-noise helical mesh, and paired left/right helical gear sets for crossed-axis or parallel-shaft gearboxes. Long-tail use cases: stainless steel helical pinion gear for stepper motor, Module 1 left-hand gear for CNC Z-axis, 45-degree helix angle gear for quiet automation drive.
| Material | Stainless Steel |
|---|---|
| Helix Angle | 45° |
| Hand | Left-Hand |
| Module | Module 1 / Module 1.5 (see variant options) |
| Tooth Count | 10 T / 13 T / 15 T / 20 T (see variant options) |
| Bore Size | 6 mm / 8 mm / 10 mm / 12 mm / 14 mm / 15 mm / 16 mm (see variant options) |
| Keyway | 4 mm keyway (10 mm, 12 mm bore) / 5 mm keyway (14 mm, 15 mm bore) / None (see variant options) |
| Pitch Diameter (Module 1) | Typically 13–20 mm depending on tooth count |
| Pitch Diameter (Module 1.5) | Typically 15–22.5 mm depending on tooth count |
| Finish | Natural stainless (uncoated) |
| Quantity per Order | 1 pcs |
| Weight | See variant options |
Module number defines the tooth size and pitch diameter. Module 1.5 gears have larger, stronger teeth and a bigger pitch diameter for the same tooth count compared to Module 1. Choose Module 1 for compact, lightweight drives; choose Module 1.5 when you need higher torque capacity or are matching an existing Module 1.5 mating gear.
A plain bore secured with a set screw is sufficient for light-to-moderate torque applications. If your motor or shaft transmits high torque or experiences reversing loads, a keyway bore provides a positive mechanical lock that prevents rotational slip. Select the keyway variant that matches your shaft's existing key dimensions (4 mm or 5 mm).
Stainless steel offers a good balance of tensile strength, corrosion resistance, and machinability. It is well-suited for light-to-medium duty automation, robotics, and CNC applications. For very high-load industrial gearboxes, consider whether a hardened alloy steel gear would be more appropriate for your torque and fatigue requirements.
Yes — stainless steel provides inherent corrosion resistance suitable for humid environments, light splash exposure, and mild chemical contact. It is not recommended for continuous immersion in aggressive acids or chloride-heavy solutions without additional protective measures.
You need a right-hand helical gear with the same module (1 or 1.5) and the same 45° helix angle. The tooth counts of the two mating gears determine your gear ratio — they do not need to be identical. Ensure the center distance matches the sum of the two pitch radii for proper mesh.
Yes. The compact tooth counts (10–20 T) and available bore sizes (6–16 mm) cover the most common NEMA 17, NEMA 23, and small servo motor shaft diameters. Verify your motor shaft diameter and select the matching bore size. For shafts with a flat or key, choose the corresponding keyway variant.
Measure your motor or drive shaft diameter with a caliper. The bore size must match or be within the tolerance of your shaft diameter. If your shaft has a key slot, measure the key width (typically 4 mm or 5 mm for shafts in this diameter range) and select the matching keyway bore option.
