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When metal gears create too much noise, add unwanted weight, or corrode in humid environments, engineers and makers turn to nylon spur gears. Whether you're building a custom robot arm, upgrading a 3D printer extruder drive, or designing a low-speed automation rig, finding a Module 3 plastic pinion gear in the exact tooth count you need can be a frustrating search — this listing solves that with 41 tooth-count options in a single place.
These Module 3 nylon flat spur gears are machined from engineering-grade nylon (PA66), offering a good balance of tensile strength, low friction, and dimensional stability. The module (pitch) is 3 mm, meaning the tooth pitch diameter equals 3 × tooth count (e.g., a 20-tooth gear has a 60 mm pitch diameter). Tooth counts range from 12 to 60, covering pitch diameters of approximately 36 mm (1.42 in) to 180 mm (7.09 in). Bore diameter and face width vary by tooth count — see variant options for exact dimensions.
Typical use cases include DIY robotics and servo-driven mechanisms where quiet operation matters, 3D printer filament drive and extruder gear trains, RC vehicle transmission and reduction stages, and light-duty conveyor or automation projects requiring corrosion-resistant plastic pinion motor gears.
| Gear Type | Flat Spur Gear (Straight-Cut) |
|---|---|
| Module (Pitch) | Module 3 (Mod 3) |
| Material | Engineering Nylon (PA66) |
| Color | Blue |
| Tooth Count Range | 12T – 60T (41 options) |
| Pitch Diameter Range | 36 mm – 180 mm (1.42 in – 7.09 in) |
| Bore Diameter | See variant options |
| Face Width | See variant options |
| Pressure Angle | 20° |
| Tooth Profile | Standard Involute |
| Quantity per Order | 1 pcs |
| Surface Finish | Smooth machined nylon |
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, a 12-tooth pinion driving a 60-tooth gear gives a 5:1 reduction. Also confirm the resulting pitch diameter fits within your housing clearance — pitch diameter = Module × Tooth Count (e.g., 3 × 20 = 60 mm for a 20-tooth gear).
Bore diameter varies by tooth count and is listed in the variant details. Before ordering, measure your motor or shaft diameter with calipers and compare it to the bore listed for your chosen tooth count. If the bore is slightly larger than your shaft, a set screw or keyway adapter can be used to secure the gear.
These nylon spur gears are suited for light-to-medium duty applications such as robotics, 3D printer drives, RC vehicles, and small automation systems. Nylon (PA66) has good tensile strength and fatigue resistance for these use cases. For heavy industrial loads, high-torque drives, or continuous high-speed operation, metal gears are recommended instead.
One of the advantages of nylon gears is that they can run dry (without lubrication) in many applications due to the material's self-lubricating properties. For higher speeds or 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.
Yes. These gears use the standard Module 3 involute tooth profile with a 20° pressure angle, which is compatible with any other Module 3 gear or rack regardless of material (steel, aluminum, or nylon). Just ensure the mating gear is also Module 3 — mixing modules (e.g., Mod 2 with Mod 3) will result in improper meshing.
Nylon gears run noticeably quieter than steel or aluminum gears because the material absorbs vibration and impact between teeth. They are also significantly lighter — typically 6–7× less dense than steel — which reduces rotational inertia and is beneficial in weight-sensitive builds like mobile robots or 3D printer extruder carriages. The trade-off is lower load capacity and reduced heat tolerance compared to metal.
Yes. Nylon does not rust or corrode, making these gears a practical choice for outdoor enclosures, humid workshops, or applications where condensation is present. Note that nylon can absorb a small amount of moisture over time, which may cause very slight dimensional changes. For precision applications in wet environments, verify dimensional tolerances after conditioning.
