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When standard steel bearings corrode, seize, or interfere with sensitive equipment, engineers and DIY builders turn to full ceramic alternatives. These zirconium dioxide (ZrO2) full ceramic ball bearings are designed for applications where moisture, chemicals, electrical conductivity, or magnetic fields make metal bearings impractical — from food-processing machinery and marine hardware to medical devices and RC equipment.
Each bearing is constructed entirely from ZrO2 ceramic — races, balls, and cage — with no metal components. Available in MR-series miniature sizes (inner diameter typically 3–10 mm / 0.12–0.39 in) and 6700-series standard sizes (inner diameter typically 10–40 mm / 0.39–1.57 in), with thickness ranging from 2 to 8 mm (0.08–0.31 in). Select your model and exact size (ID × OD × Width in mm) from the variant options above.
Typical use cases include corrosive-environment spindles where ZrO2 ceramic ball bearings outperform stainless steel, non-magnetic instrument assemblies requiring full ceramic bearing solutions, and high-speed RC motor or drone pivot points where lightweight ceramic bearings reduce rotational mass.
| Material | Zirconium Dioxide (ZrO2) — full ceramic (races, balls, retainer) |
|---|---|
| Series | MR-series (miniature) & 6700-series (standard) |
| Inner Diameter (ID) | See variant options (range: 3–40 mm / 0.12–1.57 in) |
| Outer Diameter (OD) | See variant options (range: 6–50 mm / 0.24–1.97 in) |
| Width / Thickness | See variant options (range: 2–8 mm / 0.08–0.31 in) |
| Operating Temperature | Typically −40 °C to +300 °C (−40 °F to +572 °F) |
| Electrical Conductivity | Non-conductive (insulating ceramic) |
| Magnetic Properties | Non-magnetic |
| Lubrication | Dry / unlubricated (ceramic-on-ceramic); compatible with most lubricants if required |
| Seal / Shield | Open (unsealed) — contact us to confirm if shielded variants are needed |
| Quantity per Order | 1 piece per unit ordered |
Match the Inner Diameter (ID), Outer Diameter (OD), and Width to your housing and shaft dimensions. The size format in the variant options is ID × OD × Width in millimeters. For example, "8×22×7" means an 8 mm bore, 22 mm outer diameter, and 7 mm wide. Measure your existing bearing or housing bore with calipers before ordering.
MR-series bearings are miniature bearings with inner diameters typically ranging from 3 to 10 mm, commonly used in RC vehicles, drones, small motors, and precision instruments. The 6700-series follows standard ISO metric dimensions with larger bore sizes (10–40 mm in this listing) and is used in light industrial machinery, pumps, and larger assemblies. Both series in this listing are full ZrO2 ceramic construction.
ZrO2 ceramic has high compressive strength and hardness (approximately 8–8.5 on the Mohs scale), but ceramic is more brittle than steel under impact or shock loads. These bearings excel in applications with steady radial or axial loads in corrosive or non-magnetic environments. For heavy shock-load applications, consult your load ratings before substituting ceramic for steel.
Full ceramic ZrO2 bearings can run dry in many applications because ceramic-on-ceramic contact generates less friction than metal. However, adding a compatible lubricant (PTFE-based or ceramic-compatible grease) can extend service life in high-speed or high-load conditions. Avoid petroleum-based greases that may degrade at elevated temperatures.
Yes. ZrO2 ceramic is highly resistant to saltwater corrosion, making these bearings a practical choice for marine hardware, underwater robotics, kayak rudder pivots, and fishing reel components where stainless steel bearings may still corrode over time. The fully ceramic construction means there are no metal surfaces to oxidize.
In most cases, yes — ZrO2 ceramic bearings in standard MR and 6700 series follow the same dimensional standards as their steel counterparts, so the ID, OD, and width are interchangeable. Always verify the exact dimensions (ID × OD × Width) match your housing before installation, as tolerances can vary slightly between manufacturers.
Maximum RPM depends on the specific size, load, and lubrication conditions. Smaller-diameter bearings (e.g., MR63, MR74) can typically operate at higher RPM than larger ones. As a general guideline, full ceramic bearings can sustain higher speeds than equivalent steel bearings due to lower density and reduced centrifugal ball load. Contact us to confirm speed ratings for your specific model and application.
