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When your project demands a reliable 90° power transmission without the weight or noise of metal gears, finding the right bevel gear can be frustrating. Hobbyists, robotics builders, and automation enthusiasts who need a compact, corrosion-resistant solution will find these Module 1M white POM umbrella bevel gears a practical fit for both prototyping and finished builds.
Each gear is machined from white POM (polyoxymethylene) acetal, a self-lubricating engineering plastic known for its dimensional stability and low friction. Available in two tooth counts — 20 teeth and 40 teeth — paired in a 1:2 ratio, with bore sizes ranging from 5mm (~0.197") to 12mm (~0.472"). The module is 1M, making these gears compatible with standard metric gear systems.
Typical use cases include small CNC router axis drives, 3D printer extruder gearboxes, RC vehicle differentials, and light-duty conveyor direction-change assemblies — anywhere a quiet, low-inertia 90° bevel drive is needed.
20-tooth pinion drives a 40-tooth gear for a clean 2:1 speed reduction at 90°, ideal for compact gearbox designs.
Self-lubricating, dimensionally stable, and resistant to moisture and common chemicals — no additional lubrication required for light-duty use.
POM-on-POM or POM-on-metal meshing produces significantly less noise than all-metal gear pairs, keeping your build quiet under load.
Choose from 5mm, 6mm, 8mm, 10mm, or 12mm bore to match your shaft diameter directly — no bushing required in most cases.
POM is significantly lighter than brass or steel, reducing rotational inertia and making these gears well-suited for battery-powered or weight-sensitive applications.
Order 1, 3, or 5 pieces per variant to match your project needs — whether you're prototyping a single axis or stocking spares for a production run.
| Module | 1M |
|---|---|
| Gear Ratio | 1:2 |
| Tooth Count (Pinion / Gear) | 20 Teeth / 40 Teeth |
| Bore Diameter | 5mm / 6mm / 8mm / 10mm / 12mm (see variant options) |
| Pressure Angle | 20° |
| Gear Type | Umbrella Bevel Gear (straight bevel) |
| Material | White POM (Polyoxymethylene / Acetal) |
| Color | White |
| Shaft Angle | 90° |
| Outer Diameter (20T) | See variant options |
| Outer Diameter (40T) | See variant options |
| Hub / Boss Length | See variant options |
| Set Screw | Contact us to confirm |
| Pack Quantity | 1 / 3 / 5 pcs (see variant options) |
| Weight (per piece) | See variant options |
These two gears are designed to work together as a matched pair. The 20-tooth gear acts as the pinion (driver) and the 40-tooth gear acts as the driven gear, producing a 1:2 speed reduction ratio. If you need to reduce speed and increase torque, mount the 20T on your motor shaft and the 40T on your output shaft. You will need one of each to complete a functional bevel gear set.
Select the bore that matches your shaft diameter exactly. Available bores are 5mm, 6mm, 8mm, 10mm, and 12mm. If your shaft is metric and falls within this range, choose the matching size. For imperial shafts, convert first — for example, a 1/4" shaft is approximately 6.35mm, so a 6mm bore would be too tight; contact us to confirm the best fit.
White POM bevel gears are well-suited for light-to-medium duty applications such as robotics, 3D printers, small CNC machines, and RC models. POM has a tensile strength of approximately 60–70 MPa and handles moderate torque reliably. For heavy industrial loads, high-impact environments, or continuous high-speed operation, a metal bevel gear would be more appropriate.
Yes. POM (acetal) has good resistance to moisture, fuels, solvents, and many common chemicals. It will not rust or corrode like metal gears, making it a practical choice for environments with occasional moisture exposure. However, POM is not recommended for prolonged immersion in strong acids or bases.
POM is inherently self-lubricating, so no grease or oil is required for light-duty use. For higher loads or faster speeds, a small amount of dry PTFE lubricant or light machine oil can extend service life and reduce wear. Avoid petroleum-based greases that may degrade the plastic over time.
Each variant listing sells one gear type (either 20T or 40T) in your chosen bore and quantity. To build a complete 1:2 bevel gear pair, you need one 20-tooth gear and one 40-tooth gear with matching or compatible bore sizes. If you are replacing a worn gear in an existing assembly, you can purchase just the tooth count you need.
Yes, Module 1M is a standardized metric gear specification. These gears will mesh correctly with any other Module 1M bevel gear of the same pressure angle (20°) and matching tooth geometry. Always verify the pressure angle and shaft angle (90°) when mixing gears from different sources.
