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Engineers, hobbyists, and equipment builders who work in wet, chemically aggressive, or electrically sensitive environments know the frustration of steel bearings that corrode, seize, or conduct stray currents. These full ceramic ZrO2 zirconia ball bearings are built for exactly those conditions — delivering smooth, reliable rotation where standard bearings fail.
Each bearing is constructed entirely from zirconium dioxide (ZrO2) ceramic — races, balls, and cage — with no steel components. Available in sizes from 608 (8×22×7 mm / 0.31"×0.87"×0.28") through 6007 (35×62×14 mm / 1.38"×2.44"×0.55"), the range covers the most common miniature and small deep-groove open bearing dimensions. The white ceramic finish is visually distinctive and indicates a fully non-metallic construction.
Typical use cases include high-speed RC car and drone spindles where reduced rotating mass matters, food processing and pharmaceutical machinery requiring non-contaminating components, saltwater marine equipment such as fishing reels and kayak rudder pivots, and medical or laboratory instruments where electrical isolation is critical. The non-magnetic property also makes these full ceramic ball bearings suitable for MRI-adjacent equipment and precision scientific instruments.
Races, rolling elements, and cage are all zirconium dioxide — no steel parts anywhere in the bearing assembly.
ZrO2 is unaffected by water, salt spray, mild acids, and most solvents, making these bearings suitable for wet or chemically active environments.
Ceramic is a natural insulator, preventing stray current passage — essential for motors, generators, and sensitive electronic assemblies.
Zero magnetic permeability allows use near MRI equipment, magnetic sensors, and precision scientific instruments without interference.
ZrO2 ceramic maintains dimensional stability across a broad temperature range, typically –40 °C to +300 °C (–40 °F to +572 °F), outperforming standard steel in thermal extremes.
Ceramic is approximately 40% lighter than bearing steel by volume, reducing rotating inertia and enabling faster spin-up in high-RPM applications such as RC motors and turbines.
| Material | Zirconium Dioxide (ZrO2) — full ceramic, all components |
|---|---|
| Bearing Type | Deep groove, open (no shield / no seal) |
| Series | 608, 6000, 6001, 6002, 6003, 6004, 6005, 6006, 6007 |
| Inner Diameter (ID) | 8 mm – 35 mm (0.31" – 1.38") — see variant options |
| Outer Diameter (OD) | 22 mm – 62 mm (0.87" – 2.44") — see variant options |
| Thickness (Width) | 7 mm – 14 mm (0.28" – 0.55") — see variant options |
| Finish / Color | White ceramic |
| Operating Temperature | Typically –40 °C to +300 °C (–40 °F to +572 °F) |
| Electrical Conductivity | Non-conductive (insulating) |
| Magnetic Properties | Non-magnetic |
| Lubrication | Dry / unlubricated (ceramic-on-ceramic; grease optional) |
| Quantity per Order | See variant options |
Match the bearing designation to your shaft diameter: 608 fits an 8 mm shaft, 6000 fits 10 mm, 6001 fits 12 mm, 6002 fits 15 mm, 6003 fits 17 mm, 6004 fits 20 mm, 6005 fits 25 mm, 6006 fits 30 mm, and 6007 fits 35 mm. Always verify the housing bore (OD) and width (thickness) against your assembly drawings before ordering.
Yes. These full ceramic ZrO2 bearings follow the same ISO/ABEC dimensional standards as equivalent steel deep-groove bearings. They are drop-in replacements for steel 608, 6000–6007 series bearings of the same designation, requiring no modification to the housing or shaft.
ZrO2 ceramic has a lower friction coefficient than steel and can run dry in many low-load, low-speed applications. For higher speeds or loads, a small amount of PTFE-based or ceramic-compatible grease extends service life. Avoid petroleum-based greases in chemically aggressive environments as they may degrade faster than the bearing itself.
ZrO2 ceramic outperforms even 316 stainless steel in most corrosive environments. It is unaffected by saltwater, chlorinated water, dilute acids, and most organic solvents. It is not recommended for concentrated hydrofluoric acid or strong alkalis at elevated temperatures, where specialized ceramics would be required.
ZrO2 ceramic is chemically inert and does not corrode or shed metallic particles, making it a common choice for food-grade and pharmaceutical machinery. However, compliance with specific regulatory standards (FDA, EU food contact, ISO 13485 for medical) depends on the full assembly design. Consult your compliance team for final approval.
Dynamic and static load ratings vary by size. As a general guide, ceramic bearings of equivalent dimensions carry load ratings comparable to or slightly lower than steel bearings of the same series, but with significantly higher speed capability. Contact us to confirm specific load data for your size and application.
These are open (unshielded, unsealed) bearings. This allows for easy inspection, cleaning, and optional re-lubrication. If your application requires protection from dust or debris ingress, consider adding an external seal or shield in your housing design.
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