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When your motion system demands quiet, smooth power transfer without the weight penalty of metal, finding the right spur gear can be a real challenge. Engineers, robotics builders, and DIY makers who rely on stepper motors or small DC drives need gears that mesh precisely, resist wear, and won't corrode — all without adding unnecessary mass to their build.
These blue nylon spur gears are machined from engineering-grade nylon (PA66), offering a lightweight yet durable alternative to metal gears. Available in four module sizes — Mod 1, 1.5, 2, and 3 — with tooth counts ranging from 12 to 60T, and bore diameters from 5 mm (0.20 in) up to 30 mm (1.18 in), including keyed bore options for positive shaft engagement. Outer diameters range from approximately 14 mm (0.55 in) for the smallest 1 Mod 12T up to around 186 mm (7.32 in) for the largest 3 Mod 60T equivalent.
Typical use cases include stepper motor drive trains in 3D printers and CNC routers, gear reduction stages in small robotic arms and automated feeders, and replacement transmission gears in light-duty conveyor or indexing systems where metal-on-metal noise is unacceptable.
| Material | Engineering Nylon (PA66) |
|---|---|
| Color | Blue |
| Module (Mod) | 1 / 1.5 / 2 / 3 (see variant options) |
| Tooth Count | 12T – 60T (see variant options) |
| Bore Diameter | 5 mm – 30 mm (see variant options) |
| Keyway | 4 mm / 5 mm / 6 mm / 8 mm / 9 mm (keyed bore variants only) |
| Pressure Angle | 20° |
| Gear Type | Spur Gear (straight tooth) |
| Outer Diameter | See variant options |
| Face Width | See variant options |
| Weight | See variant options |
| Finish | Natural machined nylon surface |
The module (Mod) must match between meshing gears — a Mod 1 gear will only mesh correctly with another Mod 1 gear. The tooth count determines your gear ratio: divide the driven gear's tooth count by the driving gear's tooth count to get the reduction ratio. For example, a 30T gear driven by a 15T gear gives a 2:1 reduction. Select the module based on the torque and size constraints of your system — larger modules handle higher torque.
Measure your shaft diameter precisely with calipers before ordering. For plain bore variants (no keyway), the bore should be a close sliding fit on the shaft, typically secured with a set screw or adhesive. For keyed bore variants, match the keyway width to your shaft's existing keyway — common sizes are 4 mm, 5 mm, 6 mm, 8 mm, and 9 mm. If your shaft has no keyway, choose a plain bore variant and use a set screw to secure it.
PA66 nylon gears have lower tensile strength than steel or aluminum, but are well-suited for light-to-medium duty applications such as stepper motor drives, 3D printer extruders, small robotic joints, and indexing mechanisms. They excel where low noise, low weight, and corrosion resistance matter more than maximum torque capacity. For high-torque or high-speed industrial applications, metal gears are recommended.
Yes. PA66 nylon is inherently corrosion-resistant and unaffected by moisture, mild acids, oils, and many common solvents. This makes these gears suitable for use in humid environments, food-adjacent machinery (non-food-contact), and outdoor robotics projects where metal gears would rust or require frequent maintenance.
Yes, these gears are commonly used with NEMA 17 and NEMA 23 stepper motors. Select a bore diameter that matches your motor's shaft diameter (e.g., 5 mm for NEMA 17, 6.35 mm or 8 mm for NEMA 23). For keyed motor shafts, choose the corresponding keyed bore variant. For plain shafts, a plain bore gear secured with a set screw is the standard approach.
Yes. These gears follow standard metric module pitch geometry and will mesh correctly with any metal or plastic spur gear of the same module and pressure angle (20°). This makes them easy to integrate into mixed-material gear trains or to replace worn metal gears in existing systems.
PA66 nylon has a continuous service temperature of approximately 80–100°C (176–212°F) under moderate load. Short-term peaks up to around 120°C (248°F) are typically tolerable. Avoid prolonged exposure to temperatures above this range, as the material may soften and deform under load. For high-temperature environments, consider metal gears instead.
