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When your project demands low-noise, vibration-dampened gear meshing and standard spur gears just aren't cutting it, these 2M module nylon helical gears are the go-to solution for hobbyists, robotics builders, and small-machine designers. The 45° helix angle distributes tooth load gradually, reducing impact noise and extending service life compared to straight-cut alternatives.
Each gear is machined from engineering-grade nylon (PA66), offering a balance of light weight, self-lubrication, and corrosion resistance. The module is 2M (2mm tooth pitch), with tooth counts ranging from 10T to 30T and bore diameters from 6mm (0.24 in) to 20mm (0.79 in). Select keyway-bored variants are available for positive shaft engagement. Both right-hand and left-hand spiral directions are stocked for paired-drive configurations.
Typical use cases include DIY CNC axis drives requiring quiet helical gear reduction, small robotic arm joints needing compact 2M pinion gears with nylon construction, and tabletop automation rigs where a plastic helical gear motor pinion reduces drivetrain noise on 6–20mm shafts.
Gradual tooth engagement reduces impact and vibration, delivering quieter operation than straight-cut gears in the same application.
Lightweight, self-lubricating, and corrosion-resistant — no external lubrication required for most indoor DIY and automation applications.
Wide tooth-count selection lets you dial in your gear ratio precisely. Module 2 is a widely used standard, ensuring broad compatibility with off-the-shelf mating gears.
Plain bore variants suit set-screw mounting; keyway-bored options (12mm+4mm, 14mm+5mm, 15mm+5mm, 16mm+5mm, 17mm+5mm, 18mm+6mm, 19mm+6mm, 20mm+6mm) provide positive torque transmission.
Both CW (right-hand) and CCW (left-hand) helix variants are stocked, enabling counter-rotating paired-shaft configurations without custom machining.
Order a single gear for prototyping or a 5-piece pack for production runs — all at consistent per-unit quality with matching dimensional tolerances.
| Module | 2M (Mod 2) |
|---|---|
| Helix Angle | 45° |
| Tooth Count Options | 10T, 13T, 15T, 20T, 26T, 30T |
| Spiral Direction | Right-hand (RH) / Left-hand (LH) |
| Bore Diameter Range | 6mm – 20mm (0.24 in – 0.79 in) |
| Keyway Options | 4mm keyway (12mm bore), 5mm keyway (14–17mm bore), 6mm keyway (18–20mm bore) |
| Material | Engineering Nylon (PA66) |
| Finish | Natural nylon (off-white / beige) |
| Outer Diameter (OD) | See variant options |
| Face Width | See variant options |
| Weight per Piece | See variant options |
| Pack Quantity | 1 pc / 2 pcs / 5 pcs |
| Application | DIY robotics, CNC drives, small automation, motor pinion drives |
Select based on your required gear ratio. Pair a small pinion (e.g., 10T or 13T) with a larger mating gear to step down speed and increase torque. For a 1:2 reduction, pair a 15T driver with a 30T driven gear. Both gears must be 2M module and the same helix angle (45°) for proper meshing.
No — for parallel-shaft drives, both mating gears must have opposite helix hands: one right-hand and one left-hand. If you need two shafts rotating in opposite directions, use one RH and one LH gear of the same tooth count. For same-direction rotation, use two gears of the same hand with an idler.
Match the bore to your shaft diameter. For a plain bore, the gear is typically secured with a set screw (not included). For shafts 12mm and above, consider a keyway variant for positive torque transmission — especially important at higher loads. Measure your shaft OD precisely before ordering; common motor shaft sizes are 6mm, 8mm, 10mm, 12mm, and 14mm.
Nylon (PA66) gears are suitable for light-to-medium duty applications — typical for DIY robotics, small CNC machines, and tabletop automation. They are not recommended for high-torque industrial drives or continuous heavy loads. The advantage is self-lubrication, corrosion resistance, and noise reduction. For high-torque applications, consider metal module 2 gears instead.
Yes — nylon (PA66) is inherently corrosion-resistant and will not rust. It performs well in mildly damp or humid indoor environments. However, prolonged submersion or exposure to strong chemicals may cause dimensional changes due to moisture absorption. For outdoor or wet environments, verify suitability for your specific conditions.
Nylon is self-lubricating, so no external lubrication is required for most light-duty DIY applications. For higher-speed or higher-load use, 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.
A plain bore gear relies on a set screw to grip the shaft — suitable for low-to-medium torque. A keyway bore has a machined slot that accepts a key inserted between the gear and shaft, providing a positive mechanical lock that prevents slipping under higher torque. If your shaft already has a keyway cut, select the matching keyway bore variant.
For a 3D printer or light CNC axis, a 2M 20T or 2M 26T with an 8mm or 10mm plain bore is a common starting point. If your motor shaft is 5mm, use a 6mm bore with a 5mm-to-6mm shaft adapter. For a CNC router with higher cutting forces, consider a keyway bore variant to prevent gear slip under load.
