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When a noisy metal gear or a seized drive train brings your project to a halt, you need a reliable drop-in replacement that won't corrode, crack, or strip under normal load. These blue nylon cylindrical spur gears are engineered for hobbyists, makers, and light-industrial builders who demand consistent mesh accuracy without the weight or noise of steel.
Each gear is precision-molded from engineering-grade nylon (PA66), finished in a distinctive blue color for easy identification in multi-gear assemblies. The 1-module tooth profile spans 12 to 160 teeth across bore sizes of 5 mm (~0.197 in), 6 mm (~0.236 in), 8 mm (~0.315 in), and 10 mm (~0.394 in), covering a wide range of shaft diameters. Outer diameters scale proportionally with tooth count, from approximately 14 mm (~0.55 in) for 12T up to approximately 162 mm (~6.38 in) for 160T.
Typical use cases include 3D printer extruder drives and motion systems, RC vehicle and robotics gearboxes requiring low-noise spur gear sets, and DIY automation rigs where a lightweight plastic cylindrical spur gear reduces inertia and self-lubricates against mating metal pinions.
Molded from PA66 nylon for a balance of rigidity, toughness, and self-lubricating properties that reduce wear on mating gears.
Standard Mod 1 pitch ensures direct interchangeability with any other Mod 1 spur gear in your drivetrain — metal or plastic.
Choose from 12 to 160 teeth in a single product listing to dial in your exact gear ratio without sourcing from multiple suppliers.
Four bore options accommodate the most common small-shaft diameters used in hobby motors, stepper shafts, and DC gear motors.
Nylon's natural damping characteristics absorb mesh vibration, making these gears noticeably quieter than equivalent steel spur gears.
Immune to rust and chemical splash in typical workshop environments; significantly lighter than metal alternatives to reduce drivetrain inertia.
| Material | Engineering Nylon (PA66) |
|---|---|
| Color | Blue |
| Module | 1 (Mod 1) |
| Tooth Count | 12 – 160 Teeth (see variant options) |
| Bore Diameter | 5 mm / 6 mm / 8 mm / 10 mm (see variant options) |
| Pressure Angle | 20° |
| Outer Diameter | (Teeth + 2) × Module — see variant options |
| Gear Type | Cylindrical Spur Gear |
| Pack Quantity | 1 Pcs / 2 Pcs / 5 Pcs (see variant options) |
| Surface Finish | Smooth molded surface |
| Operating Temperature | Typically –30 °C to +100 °C (–22 °F to +212 °F) |
| Application | Light-duty power transmission, robotics, 3D printers, RC vehicles, DIY automation |
Divide the desired gear ratio by the number of teeth on your driving gear to find the required tooth count on the driven gear. For example, a 3:1 reduction with a 20-tooth pinion requires a 60-tooth gear. Use the tooth count selector above to match your ratio.
Measure your motor or gearbox output shaft diameter with calipers. Available bores are 5 mm, 6 mm, 8 mm, and 10 mm. The bore is listed in parentheses next to each tooth count option (e.g., "20 Teeth (Bore 6mm)"). Select the option that matches your shaft.
PA66 nylon spur gears are well-suited for light-to-medium duty applications such as 3D printers, small robotics, RC vehicles, and hobby automation. They are not recommended for high-torque industrial drives or continuous heavy-load applications where steel gears are required. For borderline applications, consider ordering a 5-pack to have spares on hand.
Nylon (PA66) is inherently resistant to rust and most common workshop chemicals. It performs reliably in humid environments and light splash conditions. Note that prolonged submersion in water can cause minor dimensional swelling in nylon; for fully submerged applications, consult a materials engineer.
Yes. Any Mod 1 gear — regardless of material — will mesh correctly with these Mod 1 nylon gears, provided the pressure angle is also 20°. Pairing a nylon gear with a steel pinion is a common practice to reduce noise and extend the life of the more expensive metal component.
Nylon is self-lubricating under most light-duty conditions, so additional grease is often unnecessary. However, for higher-speed or higher-load applications, a light application of PTFE-based dry lubricant or white lithium grease can extend service life and reduce operating temperature.
Multi-packs offer a lower per-unit cost and ensure you have identical replacement gears on hand. This is especially useful in robotics or automation builds where a single worn gear can halt an entire system. The 5-pack is the most economical choice for prototyping or production runs.
