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When metal-on-metal noise, weight, or corrosion is a concern in your drive system, engineers and makers working on CNC machines, robotics, 3D printers, and light automation rigs need a reliable alternative. This 3 Mod blue nylon spur gear with step keyway bore delivers quiet, smooth meshing with reduced vibration — making it a practical choice for applications where noise reduction and weight savings matter.
Each gear is machined from engineering-grade nylon (PA66), colored blue for easy identification in multi-gear assemblies. The stepped hub design accommodates keyway bores ranging from 14 mm to 30 mm (approximately 0.55 in to 1.18 in), with tooth counts from 12 to 20 teeth and a module of 3. Pitch diameter ranges from approximately 36 mm (1.42 in) for 12T up to 60 mm (2.36 in) for 20T.
Typical use cases include low-to-medium load conveyor drives where noise reduction is critical, stepper motor pinion stages in desktop CNC routers and laser cutters, and lightweight gear trains in educational robotics platforms and prototype automation rigs.
| Module (Mod) | 3 |
|---|---|
| Number of Teeth | 12 / 13 / 14 / 15 / 16 / 18 / 20 (see variant options) |
| Bore Diameter | 14 / 15 / 16 / 18 / 20 / 22 / 24 / 25 / 28 / 30 mm (see variant options) |
| Keyway Width | 5 mm (bore 14–16 mm) / 6 mm (bore 18–22 mm) / 8 mm (bore 24–30 mm) |
| Pitch Diameter Range | 36 mm (12T) – 60 mm (20T) / approx. 1.42–2.36 in |
| Hub Style | Stepped hub with keyway |
| Material | Engineering-grade nylon (PA66) |
| Color | Blue |
| Pressure Angle | 20° |
| Tooth Profile | Standard involute spur |
| Quantity per Order | 1 piece |
| Weight | See variant options |
The tooth count determines the gear ratio when paired with a mating gear. Divide the driven gear teeth by the driving gear teeth to get the ratio. For example, pairing a 12T pinion with a 60T gear gives a 5:1 reduction. Choose a smaller tooth count for higher speed reduction and more torque output, or a larger count for closer to 1:1 ratios.
Measure your motor or drive shaft diameter precisely with calipers. Select the bore size that matches your shaft diameter exactly — the keyway bore is machined to standard tolerances for a snug fit with a matching key. Available bores range from 14 mm to 30 mm. If your shaft is metric, match it directly; if imperial, convert and select the nearest available size.
Nylon gears are well-suited for low-to-medium torque applications but are not a direct replacement for steel in high-load or high-temperature environments. PA66 nylon has good tensile strength for light automation, CNC routing, and robotics, but if your application involves sustained heavy loads, shock loading, or temperatures above approximately 100°C (212°F), a metal gear would be more appropriate.
Yes. Nylon (PA66) is inherently resistant to moisture, mild oils, and many common chemicals. It will not rust or oxidize. It is suitable for lightly humid environments, indoor washdown-adjacent areas, or applications where occasional moisture exposure is expected. Avoid prolonged submersion or exposure to strong acids and solvents.
Yes. This gear follows the standard Module 3 involute tooth profile with a 20° pressure angle, which is fully compatible with any standard Mod 3 spur gear, pinion, or rack regardless of material (steel, aluminum, or nylon). Ensure the mating gear also has Module 3 — gears of different modules will not mesh correctly.
The stepped hub provides a shoulder that acts as an axial stop, making it easier to position the gear consistently on the shaft without additional spacers in many setups. Slide the gear onto the shaft until the step seats against your reference surface, insert the key into the keyway, and secure with a set screw or retaining ring as appropriate for your assembly.
Nylon is self-lubricating in many light-duty applications and can run dry at low speeds and loads. For higher speeds or moderate loads, a light application of white lithium grease or PTFE-based lubricant can extend service life. Avoid petroleum-based oils that may degrade nylon over time.
