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When your CNC router, robotic arm, or motorized mechanism demands smooth, quiet gear engagement without the weight penalty of metal, finding a reliable nylon spur gear in the exact tooth count and bore size you need can be a real challenge. These Nylon Mod 2 Spur Gears are engineered for makers, robotics builders, and automation engineers who need dimensionally accurate, drop-in-ready gears that mate cleanly with standard Mod 2 gear trains.
Each gear is machined from engineering-grade blue nylon (PA66 or equivalent), offering a good balance of rigidity, wear resistance, and self-lubricating properties. The gear body spans tooth counts from 12 to 30 teeth, with bore sizes ranging from 8 mm (0.31 in) up to 25 mm (0.98 in). Keyway options — 4 mm, 5 mm, 6 mm, 8 mm, and 9 mm wide — are available on larger bore variants to ensure positive shaft engagement without slippage. The step pinion hub design provides an extended boss for secure shaft retention and easy collar or set-screw mounting.
Typical use cases include DIY CNC gantry drives and rack-and-pinion systems, small-scale conveyor and indexing mechanisms, 3D printer extruder and axis drive trains, and educational robotics platforms requiring lightweight Mod 2 spur gear replacements.
Manufactured from PA66-class nylon for consistent dimensional accuracy, moderate load capacity, and inherent self-lubrication that reduces maintenance intervals.
Full Mod 2 involute tooth geometry ensures smooth mesh with any standard Mod 2 counterpart — racks, pinions, or mating spur gears — with minimal backlash.
Choose from plain bores (8 mm, 10 mm) or keyed bores (12–25 mm with 4–9 mm wide keyways) to match your motor shaft or drive shaft without custom machining.
The extended stepped hub provides additional shaft engagement length, improving torque transfer and allowing set-screw or collar retention on both plain and keyed shafts.
Nylon construction dampens vibration and gear noise compared to metal alternatives, making these gears well-suited for indoor robotics, lab equipment, and noise-sensitive enclosures.
Fourteen tooth-count options from 12 T to 30 T let you dial in the exact gear ratio your drive system requires without resorting to custom-cut gears.
| Module (Mod) | 2 |
|---|---|
| Tooth Count Range | 12 T, 13 T, 15 T, 16 T, 17 T, 18 T, 20 T, 22 T, 23 T, 24 T, 25 T, 26 T, 28 T, 30 T |
| Bore Size Options | 8 mm, 10 mm, 12 mm, 14 mm, 15 mm, 16 mm, 18 mm, 20 mm, 22 mm, 24 mm, 25 mm |
| Keyway Width Options | None (plain bore) / 4 mm / 5 mm / 6 mm / 8 mm / 9 mm — see variant options |
| Pitch Diameter | Mod × Teeth (e.g., 12 T = 24 mm / 0.94 in; 30 T = 60 mm / 2.36 in) |
| Gear Face Width | See variant options |
| Hub Style | Step pinion (extended boss) |
| Material | Engineering nylon (PA66-class) |
| Color | Blue |
| Pressure Angle | 20° |
| Quantity per Order | 1 pc |
| Weight | See variant options |
Select your tooth count based on the gear ratio you need. Divide the driven gear teeth by the driving gear teeth to get the ratio. For example, pairing a 15 T pinion with a 30 T gear gives a 2:1 reduction. Smaller tooth counts (12–16 T) are common on motor pinions; larger counts (22–30 T) suit driven or idler positions. Always verify the resulting pitch diameter fits within your housing clearance.
Measure your motor or drive shaft diameter precisely with calipers. Select the bore size that matches — plain bores (8 mm, 10 mm) suit shafts secured with set screws or adhesive. For higher torque applications, choose a keyed bore variant whose keyway width matches your shaft's existing keyway (e.g., a 12 mm shaft with a 4 mm key → select "12 mm + 4 mm Wide Keyway"). Never force a gear onto an oversized shaft.
Engineering nylon (PA66-class) offers a tensile strength typically in the range of 70–85 MPa and is suitable for light-to-medium duty power transmission — ideal for CNC routers, 3D printer drives, small conveyors, and educational robotics. For heavy industrial loads, continuous high-torque applications, or environments above ~80 °C (176 °F), a metal gear may be more appropriate. Contact us to confirm suitability for your specific load requirements.
Nylon is inherently self-lubricating, so these gears can run dry in many light-duty applications. For extended service life under moderate loads, a light application of white lithium grease or PTFE-based lubricant is recommended. Avoid petroleum-based oils that may degrade nylon over time.
Yes. Module 2 is a standardized gear pitch, so these nylon spur gears will mesh correctly with any Mod 2 metal spur gear, rack, or pinion of the same module. Ensure the mating gear also uses a 20° pressure angle (the most common standard) for optimal tooth contact.
Plain bore variants (8 mm, 10 mm) rely on set screws or shaft collars to prevent rotation — suitable for lower torque or where the shaft has a flat. Keyed bore variants include a machined keyway slot that accepts a matching key on the shaft, providing a positive mechanical lock that handles higher torque without slippage. Choose keyed bores for motor-driven applications where reliable torque transfer is critical.
Nylon has moderate moisture absorption which can cause slight dimensional changes over time in very humid or wet conditions. For occasional outdoor or damp-environment use, these gears perform adequately. For continuous outdoor exposure or submersion, consider specifying an acetal (POM) or metal gear instead. Contact us to confirm suitability for your environment.
