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Engineers and maintenance professionals working in corrosive, high-temperature, or electrically sensitive environments know the cost of bearing failure: unplanned downtime, contaminated product, and accelerated wear on surrounding components. Standard steel bearings corrode, conduct electricity, and require constant lubrication — none of which is acceptable in food processing lines, chemical pumps, or medical equipment.
These ZrO2 zirconium oxide full ball ceramic bearings feature an all-ceramic construction — balls, inner race, and outer race — with no steel components. Available in three large-frame sizes: 6210 (50×90×20 mm / 1.969"×3.543"×0.787"), 6211 (55×100×21 mm / 2.165"×3.937"×0.827"), and 6212 (60×110×22 mm / 2.362"×4.331"×0.866"). Retainer material is typically PTFE or ceramic, depending on variant.
Typical applications include centrifugal pumps handling aggressive media, food and beverage conveyor systems requiring wash-down compatibility, electric motor spindles where stray currents cause pitting, and high-speed textile or semiconductor equipment where non-magnetic operation is critical.
| Bearing Type | Full Ceramic Deep-Groove Ball Bearing |
|---|---|
| Material (Balls & Races) | Zirconium Oxide (ZrO2) |
| Retainer Material | See variant options |
| Available Models | 6210 / 6211 / 6212 |
| Bore Diameter (ID) | 50 mm / 55 mm / 60 mm (1.969" / 2.165" / 2.362") |
| Outer Diameter (OD) | 90 mm / 100 mm / 110 mm (3.543" / 3.937" / 4.331") |
| Width | 20 mm / 21 mm / 22 mm (0.787" / 0.827" / 0.866") |
| Max Operating Temperature | Typically up to 400 °C (752 °F) |
| Electrical Conductivity | Non-conductive |
| Magnetic Properties | Non-magnetic |
| Lubrication | Dry or minimal lubrication compatible |
| Quantity per Order | 1 pcs |
| Dimensional Standard | ISO 15 / JIS B 1521 compatible |
Match the bearing to your shaft diameter: 6210 fits a 50 mm shaft, 6211 fits 55 mm, and 6212 fits 60 mm. Also verify the housing bore accepts the corresponding outer diameter (90 mm, 100 mm, or 110 mm respectively) and that the width (20–22 mm) fits your bearing seat depth.
Yes — the outer dimensions follow the same ISO deep-groove ball bearing envelope as their steel equivalents, so they fit the same housings and shafts. However, ceramic bearings have different load ratings and thermal expansion coefficients, so confirm your application's dynamic load requirements before substituting.
Zirconium oxide is chemically inert to most acids, alkalis, and salt solutions that would corrode even 316 stainless steel over time. It does not rust, and there is no metallic surface to oxidize. For highly concentrated hydrofluoric acid environments, contact us to confirm compatibility.
ZrO2 ceramic has a lower surface friction coefficient than steel and can operate with minimal or no lubrication in clean, low-load conditions. For continuous high-speed or high-load applications, a small amount of compatible grease or dry lubricant (e.g., PTFE-based) extends service life. Avoid petroleum-based greases in food-contact environments.
Yes. ZrO2 is an electrical insulator with volume resistivity typically exceeding 10¹⁰ Ω·cm. This makes these bearings effective at blocking stray currents from variable frequency drives (VFDs) that cause electrical discharge machining (EDM) pitting in steel bearings.
Full ceramic bearings generally have lower dynamic load ratings than equivalent steel bearings due to the brittleness of ceramic under impact loads. They perform best in moderate radial loads, high-speed rotation, and environments where corrosion or electrical isolation is the primary concern. For exact load ratings, contact us to confirm.
ZrO2 ceramic is non-toxic and does not corrode or leach metallic particles, making it suitable for food processing and beverage equipment. Confirm that the retainer material in your selected variant is also food-grade (PTFE retainers are generally accepted). Always verify compliance with your local food safety regulations.
