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When your drive system demands smooth, low-noise power transmission and standard steel gears are simply too heavy or too loud, engineers and makers turn to nylon helical pinions. This Module 2 left-hand helical gear is designed for hobbyists, robotics builders, and automation integrators who need a reliable, lightweight meshing component that pairs correctly with right-hand helical racks or opposing-hand gear sets.
Each gear is machined from engineering-grade nylon, finished in blue for easy identification in mixed-material assemblies. Available in 13-tooth and 15-tooth configurations, with a 45° helix angle and bore sizes ranging from 14 mm to 20 mm (approximately 0.55 in to 0.79 in), all bores include a matching keyway (5 mm or 6 mm depending on bore size) for positive shaft engagement without slippage.
Typical applications include compact conveyor pinion drives requiring quiet operation, DIY CNC router Z-axis helical gear sets, and lightweight robotic arm joint drives where nylon helical gears reduce backlash noise compared to spur alternatives.
Engineered for correct mesh with right-hand helical counterparts, enabling smooth, progressive tooth engagement that reduces vibration and noise versus straight spur gears.
Nylon offers self-lubricating properties, corrosion resistance, and reduced weight — ideal for applications where metal gears would add unnecessary mass or require lubrication maintenance.
Two tooth count options let you tune your gear ratio precisely. Module 2 is a widely adopted metric standard, ensuring broad compatibility with off-the-shelf racks and mating gears.
Seven bore sizes with integrated keyways (5 mm keyway for 14–18 mm bores; 6 mm keyway for 18–20 mm bores) provide positive, slip-free shaft coupling without additional machining.
The distinctive blue finish makes it straightforward to identify left-hand helical components in assemblies containing both left- and right-hand gears, reducing assembly errors.
Order 1 to 5 pieces per transaction to match your project scale — whether you need a single replacement pinion or a set for a multi-axis system.
| Module | 2 |
|---|---|
| Helix Angle | 45° |
| Hand | Left-hand |
| Tooth Count | 13 tooth / 15 tooth (see variant options) |
| Material | Engineering-grade nylon |
| Color | Blue |
| Bore Size Range | 14 mm – 20 mm (0.55 in – 0.79 in) |
| Keyway Width | 5 mm (for 14–17 mm bore) / 6 mm (for 18–20 mm bore) |
| Pitch Diameter (13T) | 26 mm (1.02 in) |
| Pitch Diameter (15T) | 30 mm (1.18 in) |
| Face Width | See variant options |
| Pressure Angle | 20° |
| Quantity per Order | 1 / 2 / 3 / 4 / 5 pcs (see variant options) |
The tooth count determines your gear ratio when paired with a rack or mating gear. A 13-tooth pinion gives a higher reduction ratio (more torque, less speed) compared to a 15-tooth pinion. If you need faster linear travel on a rack-and-pinion system, choose 15T; for more torque in a compact package, choose 13T. Both are Module 2 and share the same 45° left-hand helix angle.
Measure your shaft diameter precisely with calipers. Select the bore size that matches your shaft (e.g., 16 mm shaft → 16 mm + 5 mm keyway bore). The keyway width is 5 mm for bores from 14 mm to 17 mm, and 6 mm for bores from 18 mm to 20 mm. Ensure your shaft has a matching keyway cut to the same width for a secure fit.
Engineering-grade nylon is well-suited for light-to-medium duty drives, robotics, automation, and DIY machinery where loads are moderate and quiet operation is a priority. Nylon gears are not recommended for high-torque, high-temperature, or heavy industrial applications where steel or brass gears would be more appropriate. If you are unsure, calculate the tangential force on the gear tooth and compare it against nylon's rated flexural strength for your operating temperature.
Yes. Nylon is inherently corrosion-resistant and performs well in environments where metal gears would rust or oxidize. However, nylon can absorb moisture over time, which may cause slight dimensional changes. For high-humidity or submerged environments, verify dimensional tolerances are acceptable for your application, or consider a moisture-stabilized nylon grade.
This is a left-hand helical gear. It meshes correctly with a Module 2 right-hand helical rack or a right-hand helical gear of the same module and helix angle (45°). Do not pair it with spur gears or racks — the helix angle must match for proper tooth contact. Confirm the hand (left vs. right) of your existing rack or mating gear before ordering.
One of the advantages of nylon is its self-lubricating surface, which means many light-duty applications run dry without additional lubrication. For higher speeds or loads, a light application of PTFE-based dry lubricant or white lithium grease can extend service life. Avoid petroleum-based oils that may degrade nylon over time.
Yes. Each variant listing allows you to select 1, 2, 3, 4, or 5 pieces per order. Choose the quantity that matches your project needs. All pieces in a multi-pack are identical in module, tooth count, bore size, and helix angle.
