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When your drive system demands smooth, low-noise power transmission and standard spur gears fall short, a left-hand helical gear delivers the angular engagement that reduces backlash and vibration. Designed for engineers, CNC builders, robotics enthusiasts, and automation hobbyists who need reliable torque transfer in compact mechanical assemblies.
These module 1 and 1.5 helical gears are machined from 304 stainless steel, offering solid corrosion resistance for both indoor and light outdoor applications. Available in 13T, 15T, and 20T tooth counts across Module 1 (pitch diameter range approximately 13–20mm / 0.51–0.79 in) and Module 1.5 (pitch diameter range approximately 15–30mm / 0.59–1.18 in). Bore options span 6mm to 16mm plain bore, plus keyed variants with 4mm and 5mm keyways for shaft-locking applications.
Typical use cases include CNC router axis drives requiring left-hand helical pairing, robotics joint actuators where noise reduction is critical, and custom automation conveyor systems needing stainless-compatible gear trains.
Resists rust and oxidation in humid or mildly corrosive environments, extending service life over carbon steel alternatives.
Engineered 45-degree helix provides smoother tooth engagement, reduced operating noise, and improved load distribution compared to straight-cut spur gears.
Three tooth count options across Module 1 and 1.5 allow flexible gear ratio selection for your specific speed and torque requirements.
Plain bore from 6mm to 16mm, plus keyed bore variants (10mm+4mm keyway, 12mm+4mm, 14mm+5mm, 15mm+5mm) for positive shaft retention without set screws alone.
Both metric module standards covered in one listing — select the module that matches your mating gear or rack for correct pitch compatibility.
Dimensionally consistent machining makes these gears a reliable drop-in for DIY CNC builds, robotic arms, conveyor drives, and custom motion control projects.
| Material | 304 Stainless Steel |
|---|---|
| Module | 1 / 1.5 (select variant) |
| Helix Angle | 45° |
| Helix Direction | Left-Hand |
| Tooth Count | 13T / 15T / 20T (select variant) |
| Bore Diameter | 6 / 8 / 10 / 12 / 14 / 15 / 16mm plain; keyed options available (select variant) |
| Keyway | 4mm (for 10–12mm bore) / 5mm (for 14–15mm bore) — See variant options |
| Pitch Diameter (M1) | Approx. 13–20mm (0.51–0.79 in) depending on tooth count |
| Pitch Diameter (M1.5) | Approx. 15–30mm (0.59–1.18 in) depending on tooth count |
| Face Width | See variant options |
| Surface Finish | Machined, natural stainless |
| Application | CNC, robotics, automation, conveyor drives |
Module (M) defines the tooth size and pitch. Module 1 gears have smaller teeth and suit lighter loads or compact assemblies, while Module 1.5 gears have larger teeth and handle higher torque. You must match the module of your gear to the module of its mating gear or rack — mixing modules will result in incorrect mesh and damage.
Left-hand helix means the teeth spiral in a left-hand direction when viewed from the front. For parallel-shaft drives, a left-hand helical gear must mesh with a right-hand helical gear of the same helix angle and module. If you are replacing an existing gear, confirm the helix direction of the mating gear before ordering.
Select a bore diameter that matches your shaft diameter exactly. For plain bore variants (6–16mm), the gear slides onto the shaft and is typically secured with a set screw or adhesive. For keyed variants, the keyway provides positive rotational locking — choose the keyway size that matches your shaft's key slot (4mm or 5mm).
304 stainless steel offers good tensile strength (typically 515–620 MPa) and is well-suited for light-to-medium duty power transmission in CNC, robotics, and automation applications. For heavy industrial loads or high-impact environments, consider hardened steel or alloy steel gears instead. These gears are not rated for continuous high-torque industrial machinery.
304 stainless steel provides solid corrosion resistance in most indoor environments and light outdoor or humid conditions. It is not fully immune to corrosion in chloride-rich or highly acidic environments. For marine or chemical exposure, 316 stainless steel would be a more appropriate choice.
These are helical gears, not spur gears. A helical gear meshes with a helical rack of the same module and matching helix angle/direction, or with another helical gear on a parallel shaft. They will not mesh correctly with a standard straight-tooth spur rack. Confirm your rack or mating gear is also helical with a 45° helix angle before purchasing.
Plain bore variants have a smooth cylindrical hole and rely on set screws or shaft collars for retention — easier to install but may slip under high torque. Keyed bore variants include a machined keyway slot that accepts a key inserted into a matching slot on the shaft, providing positive rotational locking and making them more suitable for higher-torque or reversing-load applications.
🛒 Select your Model (Module + Tooth Count) and Bore size above, then add to cart.
