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Engineers and makers building compact drive trains often struggle to find helical pinion gears that combine low noise, corrosion resistance, and accurate tooth geometry in a single off-the-shelf part. These Module 1.5 left-hand helical gears are designed for DIY CNC builders, robotics integrators, and automation hobbyists who need a reliable, drop-in pinion without custom machining.
Each gear is machined from engineering-grade blue nylon, offering a lightweight yet durable alternative to metal pinions in moderate-load applications. The module 1.5 pitch covers tooth counts of 10, 13, 15, and 20, with bore diameters ranging from 8 mm (0.31 in) to 18 mm (0.71 in). Keyway options (4 mm and 5–6 mm depending on bore) are available on larger bores for positive shaft engagement. The 45° left-hand helix angle pairs with right-hand helical racks or mating gears to deliver smooth, low-vibration motion.
Typical use cases include: helical rack-and-pinion linear actuators for CNC router Z-axes, quiet gear reduction stages in 3D printer extruder drives, and compact rotary indexing mechanisms in tabletop automation rigs where metal gear noise is unacceptable.
Manufactured from reinforced nylon for a favorable strength-to-weight ratio, inherent corrosion resistance, and self-lubricating properties that reduce maintenance intervals in dry-running applications.
The precise 45° helix delivers gradual tooth engagement, distributing load across multiple teeth simultaneously for quieter operation and reduced peak stress compared to spur gears of the same module.
Available in bore sizes from 8 mm to 18 mm. Larger bores include machined keyways (4 mm, 5 mm, or 6 mm) for positive torque transmission without relying solely on set screws.
Choose from 10, 13, 15, or 20 teeth to dial in your gear ratio. Smaller tooth counts suit high-speed, low-torque pinion stages; larger counts provide smoother engagement at moderate speeds.
Order a single gear for prototyping or up to 5 pieces for production builds and spares inventory — all cut from the same tooling for consistent tooth geometry across the batch.
The helical tooth form and nylon material combine to dampen transmission noise and vibration, making these gears well-suited for enclosed enclosures, lab equipment, and noise-sensitive environments.
| Module | 1.5 |
|---|---|
| Helix Angle | 45° |
| Hand | Left-hand |
| Tooth Count | 10 / 13 / 15 / 20 (see variant options) |
| Bore Diameter | 8 mm / 10 mm / 12 mm / 14 mm / 15 mm / 16 mm / 17 mm / 18 mm (see variant options) |
| Keyway | 4 mm (10–12 mm bore) / 5 mm (14–17 mm bore) / 6 mm (18 mm bore) / None (8–10 mm plain bore) |
| Material | Engineering Nylon (PA) |
| Color | Blue |
| Pressure Angle | 20° (standard) |
| Face Width | See variant options |
| Outside Diameter | See variant options |
| Pack Quantity | 1 / 2 / 3 / 4 / 5 pcs (see variant options) |
Tooth count determines your gear ratio when paired with a rack or mating gear. A 10-tooth pinion gives a higher speed ratio (more rotations per linear unit on a rack), while a 20-tooth pinion provides smoother engagement and lower contact stress. For CNC router axes, 15–20 teeth are common; for compact extruder drives, 10–13 teeth are typical. Calculate your required ratio first, then select the tooth count that fits your bore and shaft size.
Match the bore diameter to your motor or drive shaft OD. If your shaft has a keyway, select the corresponding bore + keyway variant (e.g., 12 mm + 4 mm Keyway for a 12 mm keyed shaft). Plain bore variants (8 mm and 10 mm) rely on a set screw for retention and suit shafts without keyways. Always measure your shaft with calipers before ordering.
Engineering nylon (PA) gears handle moderate torque loads well and are preferred where noise reduction, weight savings, or corrosion resistance outweigh the need for maximum torque capacity. They are not recommended for high-torque, high-temperature, or continuous heavy-duty industrial applications where steel or aluminum gears are more appropriate. For typical CNC, robotics, and light automation loads, nylon gears perform reliably.
Yes. Nylon is inherently resistant to moisture, mild chemicals, and oxidation, making these gears suitable for humid environments, food-adjacent equipment (non-food-contact), and outdoor enclosures where metal gears would corrode. No additional coating or lubrication is required for standard operation, though a light dry lubricant can extend tooth life under continuous cycling.
These are left-hand 45° helical gears. They mate with Module 1.5 right-hand helical racks (for linear motion) or Module 1.5 right-hand helical gears (for rotary reduction). Do not pair with spur gears or racks — the helix angle must match (opposite hand) for correct meshing. Confirm the module, helix angle, and pressure angle of your mating component before purchase.
Yes. Select the Amount variant (1–5 pcs) to order the quantity you need in a single transaction. All pieces in a multi-pack are cut from the same tooling run, ensuring consistent tooth geometry and bore concentricity across the batch — important for paired-axis CNC machines or multi-stage gear trains.
Nylon is self-lubricating under most light-to-moderate load conditions, so no lubrication is required for standard use. For high-cycle or continuous-duty applications, a PTFE-based dry lubricant applied to the tooth faces can reduce wear and extend service life. Avoid oil-based lubricants that may swell or degrade the nylon over time.
