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Engineers and makers building CNC routers, robotic arms, or precision automation systems often struggle with noisy, corrosion-prone metal gears that demand constant lubrication. These 45° left-spiral helical gears are designed for builders who need smooth, low-noise power transmission without the maintenance overhead of steel components.
Each gear is machined from engineering-grade blue nylon (PA66), offering a self-lubricating, lightweight alternative to metal. The stepped hub design accommodates a wide range of bore diameters — from 6 mm (0.24 in) up to 20 mm (0.79 in) — with optional keyway cuts (4 mm or 5 mm or 6 mm) for positive shaft engagement. Module options span 1 Mod through 2 Mod, with tooth counts from 10 to 26 teeth, covering pitch diameters of approximately 10 mm to 52 mm (0.39 in to 2.05 in).
Typical use cases include: low-noise helical gear drives for desktop CNC milling machines, lightweight transmission stages in 3D printer extruder gearboxes, and corrosion-resistant motion-control assemblies for food-adjacent or humid-environment robotics.
The 45° spiral angle ensures gradual tooth engagement, dramatically reducing impact noise and vibration compared to straight-cut spur gears — ideal for noise-sensitive lab or office environments.
PA66 nylon offers inherent self-lubrication, chemical resistance, and a strength-to-weight ratio that outperforms standard plastics — no grease required for typical light-duty cycles.
The stepped bore design supports plain bores (6–16 mm) and keyed bores (10 mm+4 mm keyway up to 20 mm+6 mm keyway), providing positive torque transfer without set-screw slip.
Ten size combinations across three module values (1, 1.5, 2) and tooth counts from 10 to 26 let you dial in the exact gear ratio and pitch diameter your drivetrain requires.
Unlike steel gears, nylon does not rust or oxidize, making these gears suitable for humid environments, light washdown areas, or applications where metal contamination is a concern.
Available in 1, 3, 5, or 10-piece packs so you can order exactly what your project needs — whether prototyping a single axis or stocking a production run.
| Material | PA66 Engineering Nylon (Blue) |
|---|---|
| Helix Angle | 45° Left Spiral |
| Module (Mod) | 1 / 1.5 / 2 (see variant options) |
| Tooth Count | 10 – 26 Teeth (see variant options) |
| Bore Diameter | 6 mm – 20 mm (see variant options) |
| Keyway | 4 mm / 5 mm / 6 mm (keyway variants only) |
| Pitch Diameter (approx.) | 10 mm – 52 mm (0.39 in – 2.05 in) |
| Hub Style | Stepped Hub |
| Pressure Angle | 20° (standard) |
| Finish | Blue (natural nylon color) |
| Packing Quantity | 1 / 3 / 5 / 10 Pcs (see variant options) |
| Weight (per piece) | See variant options |
The module (Mod) determines the tooth size and must match your mating gear or rack exactly. A higher module means larger, stronger teeth. Tooth count controls the pitch diameter (PD = Module × Teeth) and your gear ratio. For example, a 1 Mod 20T gear has a 20 mm pitch diameter. Pair it with a 1 Mod 40T gear for a 2:1 reduction.
Yes — for parallel-shaft helical gear pairs, one gear must be left-hand and the other right-hand spiral with the same helix angle and module. These left-spiral gears are designed to mate with right-spiral counterparts of the same module and 45° helix angle.
PA66 nylon gears are well-suited for light-to-medium duty applications (typically up to a few Nm of torque depending on module and speed). They are not recommended for high-torque or high-temperature environments above approximately 100°C (212°F). For heavy industrial loads, metal gears are more appropriate.
No. PA66 nylon is inherently self-lubricating, which means these gears can run dry in most light-duty applications. Avoid petroleum-based greases that may degrade nylon over time. If lubrication is desired, use a PTFE-based or silicone-based lubricant.
Measure your shaft diameter precisely. Plain bore options (6 mm to 16 mm) are suitable for set-screw or press-fit mounting. Keyway variants (e.g., 10 mm + 4 mm keyway) provide positive torque transfer and are recommended for higher-torque or reversing-load applications. Match the keyway width to your shaft's key slot.
Yes. These gears are commonly used in desktop CNC machines, 3D printer extruder gearboxes, and light automation systems where low noise, corrosion resistance, and moderate load capacity are priorities. Verify the module and bore match your existing drivetrain components before ordering.
Plain bore variants (e.g., 6 mm, 8 mm, 10 mm) rely on a set screw or interference fit to secure the gear to the shaft. Keyway variants (e.g., 10 mm + 4 mm keyway) include a machined slot that accepts a standard key, providing a more secure, slip-resistant connection — especially important under reversing or pulsating loads.
