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When your robotics project, 3D printer gearbox, or RC drivetrain demands reliable torque transfer without the weight penalty of metal, finding the right plastic spur gear in the exact tooth count and bore diameter can be a frustrating hunt. These 1.5 modulus convex spur gears are engineered for makers, hobbyists, and engineers who need a broad selection of sizes in a single, dependable product line.
Each gear is machined from engineering-grade plastic (typically nylon or POM/Delrin), offering a balance of low friction, moderate load capacity, and corrosion resistance. The gear range covers 15 to 30 teeth across multiple bore diameters from 6 mm (0.24 in) to 16 mm (0.63 in), with outer diameters scaling proportionally from approximately 25.5 mm (1.00 in) for 15T up to 48 mm (1.89 in) for 30T at 1.5 modulus.
Typical use cases include DIY gearbox assemblies for small robotics and automation rigs, replacement transmission gears for desktop 3D printers and CNC feeders, and lightweight drive components for RC car and boat drivetrains where plastic spur gear weight savings matter.
| Modulus | 1.5 |
|---|---|
| Tooth Count Range | 15T, 16T, 18T, 20T, 22T, 24T, 25T, 28T, 30T |
| Bore Diameter Range | 6 mm – 16 mm (0.24 in – 0.63 in) |
| Outer Diameter (approx.) | 25.5 mm – 48 mm (1.00 in – 1.89 in), varies by tooth count |
| Face Width (approx.) | See variant options |
| Material | Engineering plastic (nylon or POM/Delrin) |
| Tooth Profile | Convex spur (standard involute) |
| Pressure Angle | 20° |
| Bore Fit Tolerance | Typically H7 |
| Finish | Natural (uncoated) |
| Gear Type | Spur Gear |
| Quantity per Pack | 1 piece |
The gear ratio between two meshing spur gears equals the ratio of their tooth counts. For example, pairing a 15T drive gear with a 30T driven gear gives a 2:1 reduction. Determine your required speed reduction or multiplication first, then select tooth counts that achieve that ratio while fitting within your available space envelope.
Measure your shaft diameter with a caliper and select the matching bore. For a secure press or keyed fit, choose a bore equal to your shaft diameter. If you plan to use a set screw or locking collar, a bore that matches the shaft exactly (H7 tolerance) is recommended. Not all bore sizes are available for every tooth count — check the variant options for your chosen tooth count.
Engineering plastic gears (nylon/POM) are well-suited for light-to-moderate torque applications such as small robotics, 3D printer drives, and RC transmissions. They are not recommended for high-torque industrial machinery or applications with sustained shock loading. If your application exceeds the plastic's load capacity, consider metal spur gears instead.
Nylon and POM plastics are inherently corrosion-resistant and will not rust. They can handle moderate moisture and mild chemical exposure. Prolonged UV exposure may cause slight surface degradation over time; for long-term outdoor use, consider shielding the gears from direct sunlight or applying a UV-protective coating.
Yes. Any two gears with the same modulus and pressure angle will mesh correctly regardless of material, provided the tooth counts and center distance are matched. These 1.5 Mod plastic gears will mesh with 1.5 Mod metal gears. Note that pairing plastic with metal may accelerate wear on the plastic gear under heavy loads.
POM (Delrin) is self-lubricating and typically runs dry. Nylon also has low friction properties but can benefit from a light application of dry PTFE lubricant or white lithium grease in high-cycle applications. Avoid petroleum-based oils that may swell or degrade certain plastics over time.
At 1.5 modulus, the pitch diameter equals the tooth count multiplied by the modulus (e.g., 20T × 1.5 = 30 mm pitch diameter). More teeth means a larger gear diameter. Choose a higher tooth count when you need a larger driven gear for speed reduction, or a lower tooth count for a compact drive pinion.
🛒 Select your tooth count and bore diameter above, then add to cart.
