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Engineers, hobbyists, and maintenance professionals who work in wet, chemically aggressive, or electrically sensitive environments know the frustration of steel bearings that corrode, seize, or conduct stray currents. These ZrO2 full ceramic ball bearings are built specifically for those conditions — delivering reliable rotation where conventional steel bearings fail prematurely.
Each bearing is manufactured from zirconium dioxide (ZrO2) ceramic for both the inner and outer rings and the rolling balls. The double-seal configuration (2RS or CE-2RS depending on series) retains lubrication and excludes contaminants. Available across four series — 6000, 6200, 6800, and 6900 — with bore diameters ranging from 10 mm (0.39 in) to 40 mm (1.57 in) and outer diameters from 19 mm (0.75 in) to 68 mm (2.68 in).
Typical applications include food-processing conveyor rollers where washdown chemicals are present, RC vehicle wheel hubs requiring non-magnetic bearings for sensor accuracy, pump shafts exposed to saltwater or mild acids, and medical or laboratory equipment where electrical isolation is critical.
Inner ring, outer ring, and balls are all zirconium dioxide ceramic — no steel components. Eliminates galvanic corrosion and provides electrical insulation up to several kV in dry conditions.
Rubber contact seals on both sides retain factory grease and block dust, water, and fine particulates from reaching the raceway — extending service intervals in dirty or wet environments.
ZrO2 withstands exposure to mild acids, alkalis, and many solvents that would corrode carbon steel or even stainless steel bearings, making these suitable for chemical processing and food-grade washdown lines.
Ideal for MRI-adjacent equipment, brushless motor sensor rings, and any application where stray magnetic fields or electrical conductivity through the bearing would cause interference or safety concerns.
29 size variants across 6900, 6800, 6200CE, and 6000 series cover bore diameters from 10 mm to 40 mm, letting you source multiple bearing positions from a single listing.
ZrO2 ceramic is approximately 40% lighter than bearing steel by volume, reducing centrifugal loading at high RPM and contributing to lower operating temperatures in speed-critical applications.
| Material | Zirconium Dioxide (ZrO2) — full ceramic (rings + balls) |
|---|---|
| Seal Type | Double rubber seal (2RS / CE-2RS) |
| Series | 6900, 6800, 6200CE, 6000 |
| Bore Diameter (d) | 10 mm – 40 mm (0.39 in – 1.57 in) — See variant options |
| Outer Diameter (D) | 19 mm – 68 mm (0.75 in – 2.68 in) — See variant options |
| Width (B) | 5 mm – 16 mm (0.20 in – 0.63 in) — See variant options |
| Dimensional Standard | ISO 15 metric |
| Lubrication | Factory-greased (sealed, not re-greasable) |
| Operating Temperature | Typically –20 °C to +120 °C (–4 °F to +248 °F) |
| Weight per Bearing | See variant options |
| Packing Quantity | 1 pcs per order unit |
Match the bore diameter (d) to your shaft diameter and the outer diameter (D) to your housing bore. The width (B) must fit within your housing depth. All dimensions are listed in each variant name in the format bore × OD × width (mm). If you are replacing an existing bearing, the series number (e.g., 6004) is stamped on the ring and directly corresponds to a variant in this listing.
ZrO2 ceramic bearings generally support higher limiting speeds than equivalent steel bearings due to lower density and reduced centrifugal loading on the balls. However, the double rubber seal (2RS) introduces some drag compared to open or shield-only designs. For very high-speed spindle applications, confirm the specific speed rating against your RPM requirement. Contact us to confirm if you need exact speed data for a specific size.
Yes. ZrO2 ceramic is resistant to most dilute acids, alkalis, and salt solutions. The double rubber seal provides an additional barrier. These bearings are commonly used in marine, food-processing, and light chemical environments. For concentrated strong acids or oxidizing agents, contact us to confirm suitability before ordering.
All four series are deep-groove ball bearings with the same ZrO2 full ceramic construction. The series number defines the dimensional envelope: 6900 series has a thin cross-section (narrow width relative to bore), 6800 series is similarly thin but with slightly different OD ratios, 6200CE series has a medium cross-section suitable for moderate radial and axial loads, and 6000 series has a standard cross-section for general-purpose use. Choose based on the bore/OD/width combination that fits your housing.
Yes. ZrO2 ceramic is an electrical insulator. These bearings do not conduct current between the shaft and housing, making them suitable for applications where bearing currents (common in VFD-driven motors) or electrical isolation is required. They are also non-magnetic, which is important for sensor-adjacent or MRI-compatible equipment.
Yes, each bearing is factory-greased before sealing. The double rubber seal (2RS) is a contact seal that is not designed to be removed and re-installed without risk of damage, so these bearings are not field-re-greasable. Under normal operating conditions within the rated temperature range, the factory grease provides adequate lubrication for the bearing's service life.
Before pressing the bearing onto the shaft or into the housing, verify three dimensions: bore diameter (d) against shaft diameter, outer diameter (D) against housing bore, and width (B) against housing depth. Standard interference fits for metric bearings apply — shaft tolerance typically k5 or m5 for rotating inner ring, housing tolerance H7 for stationary outer ring. If you are unsure of the fit class for your load conditions, contact us to confirm.
🛒 Select your Size and Packing Quantity above, then add to cart.
