Deine Zahlungsinformationen werden sicher verarbeitet. Wir speichern keine Kreditkartendaten und haben auch keinen Zugang zu deinen Kreditkartendaten.
When metal bearings corrode, seize, or add unwanted weight to a precision build, engineers and hobbyists alike reach for POM plastic deep groove ball bearings as a reliable alternative. These mini ball bearings are designed for RC vehicles, 3D printer carriages, small robotics, medical devices, and any application where moisture exposure or electrical isolation rules out steel.
Each bearing is machined from POM (polyoxymethylene) acetal, a dimensionally stable engineering plastic known for its low friction coefficient and resistance to water, oils, and mild chemicals. Inner diameters span 3 mm to 9 mm (approximately 0.12″ to 0.35″), with outer diameters and thicknesses varying by variant — select the exact I.D × O.D × Thickness combination from the dropdown above. Balls are typically made from stainless steel or ceramic depending on the variant; contact us to confirm ball material for your specific size.
Typical use cases include: replacing corroded steel bearings in wet-environment RC boats and drones, fitting into 3D-printed gearboxes where a non-conductive bearing is required, and serving as low-noise pivot points in camera sliders or linear motion rigs where vibration damping matters.
| Material | POM (Polyoxymethylene) Acetal Plastic |
|---|---|
| Inner Diameter (I.D.) Range | 3 mm – 9 mm (approx. 0.12″ – 0.35″) |
| Outer Diameter (O.D.) Range | See variant options |
| Thickness Range | See variant options |
| Bearing Type | Deep Groove Ball Bearing |
| Ball Material | Contact us to confirm |
| Lubrication | Typically unlubricated / dry-running |
| Operating Temperature | Typically –40°C to +100°C (–40°F to +212°F) |
| Corrosion Resistance | Water, oils, mild chemicals |
| Electrical Conductivity | Non-conductive |
| Available Quantities | 1 Pcs, 2 Pcs, 5 Pcs, 10 Pcs |
Measure your shaft diameter to determine the required Inner Diameter (I.D.), then measure your housing bore to confirm the Outer Diameter (O.D.). The thickness must fit within the axial space available in your assembly. Cross-reference these three dimensions against the I.D × O.D × Thickness options in the variant selector above.
POM plastic bearings are designed for light to moderate radial loads — typically suitable for RC vehicles, 3D printers, camera equipment, and small robotics. They are not rated for heavy industrial loads or high-impact applications. If your application involves significant axial thrust or shock loading, contact us to confirm suitability before ordering.
Yes. POM acetal does not rust or corrode when exposed to water, including saltwater, rain, and humidity. This makes these bearings a practical choice for RC boats, outdoor robotics, and marine-adjacent applications where steel bearings would degrade quickly. Avoid prolonged exposure to strong acids or bases, which can degrade POM over time.
POM has a naturally low friction coefficient and can run dry in many applications. Light lubrication with a PTFE-based or silicone grease can extend service life under higher speeds or loads, but is generally not required for typical hobby and light-duty use. Avoid petroleum-based greases, which may swell or degrade POM over time.
In most cases, yes — provided the load, speed, and temperature requirements fall within POM's operating range. The outer dimensions (I.D., O.D., thickness) are standardized to match common bearing footprints, so they drop into the same housing. The key trade-off is lower maximum load capacity and speed rating compared to steel, offset by lighter weight, corrosion resistance, and electrical isolation.
Maximum RPM varies by bearing size and load conditions. As a conservative guideline, POM plastic bearings are typically suitable for applications up to a few thousand RPM under light loads. For high-speed spindle or motor applications, contact us to confirm the speed rating for your specific I.D × O.D × Thickness variant.
Yes. The POM plastic race and cage are electrically non-conductive, which isolates the shaft from the housing. This is useful in motor mounts, PCB assemblies, and any application where preventing stray electrical currents through the bearing is a design requirement.
