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Engineers and equipment builders working in corrosive, high-temperature, or electrically sensitive environments often struggle to find bearings that hold up without constant replacement. These full ball ZrO2 ceramic bearings are designed for exactly those conditions — delivering reliable radial load performance where steel bearings fail prematurely.
Each bearing is constructed entirely from zirconium oxide (ZrO2) ceramic rolling elements with no retainer cage, allowing a full complement of balls to fill the raceway. Available bore sizes range from 4 mm to 30 mm (approximately 0.16 in to 1.18 in), with outer diameters from 7 mm to 62 mm and widths from 2 mm to 16 mm, spanning series 604 through 6906.
Typical use cases include laboratory centrifuges requiring non-magnetic rotating components, food-processing machinery exposed to wash-down chemicals, semiconductor handling equipment where electrical isolation is critical, and marine or outdoor mechanisms subject to moisture and salt exposure.
| Material | Zirconium Oxide (ZrO2) Ceramic |
|---|---|
| Bearing Type | Full Complement Deep Groove Ball Bearing (No Retainer) |
| Bore Diameter (ID) | 3 mm – 30 mm (≈ 0.12 in – 1.18 in) |
| Outer Diameter (OD) | 7 mm – 62 mm (≈ 0.28 in – 2.44 in) |
| Width | 2 mm – 16 mm (≈ 0.08 in – 0.63 in) |
| Series | 604, 605, 606, 607, 608, 609, 624–628, 683–688, 6000–6006, 6200–6206, 6800–6806, 6900–6906 |
| Retainer / Cage | None (Full Complement) |
| Electrical Conductivity | Non-conductive |
| Magnetic Properties | Non-magnetic |
| Max Operating Temperature | Typically up to 400 °C (752 °F) |
| Corrosion Resistance | Resistant to acids, alkalis, and salt solutions |
| Lubrication | See variant options |
| Seals / Shields | Open (no seals) |
| Quantity per Order | See variant options |
Match the bearing model to your shaft diameter (ID), housing bore (OD), and available axial space (Width). The model number in the variant selector is formatted as ID × OD × Width in millimeters. For example, 608 – 8×22×7 mm fits an 8 mm shaft in a 22 mm housing bore with a 7 mm width. Always measure your existing bearing or shaft before ordering.
Removing the retainer cage allows more balls to fill the raceway, which increases the bearing's radial load capacity for a given envelope size. The trade-off is a lower maximum operating speed compared to a caged bearing of the same dimensions. Full complement bearings are best suited for slow-to-moderate speed, high-load applications.
Zirconium oxide is chemically inert to most acids, alkalis, and salt solutions that would corrode chrome steel (52100) bearings within hours or days. ZrO2 bearings are widely used in chemical pumps, food-processing lines, and marine equipment where moisture and aggressive cleaning agents are present. They do not rust and require no protective coating.
Yes. ZrO2 ceramic maintains its dimensional stability and hardness at temperatures typically up to approximately 400 °C (752 °F), well above the limit of standard steel bearings (typically 120–150 °C for grease-lubricated steel). For sustained high-temperature use, ensure any lubricant or grease used is also rated for the target temperature range.
Yes. ZrO2 ceramic is an electrical insulator, so these bearings will not conduct current between the shaft and housing. This makes them appropriate for electric motors, variable-frequency drives, and precision instruments where stray currents can cause pitting damage in steel bearings (electro-corrosion). They are also fully non-magnetic, which is important for MRI-adjacent or magnetically sensitive equipment.
Full ball ceramic bearings can operate with reduced lubrication compared to steel bearings, but some lubrication is still recommended to minimize friction and extend service life. For most applications, a PTFE-based or ceramic-compatible grease is preferred. Avoid petroleum-based greases in chemically aggressive environments. For very high-temperature or vacuum applications, dry lubrication (e.g., MoS₂ coating) may be appropriate. Contact us to confirm the best lubrication approach for your specific conditions.
These designations follow standard metric bearing series conventions. The 60xx series (6000–6006) is a standard light series with a moderate OD-to-ID ratio. The 62xx series (6200–6206) has a larger OD for the same bore, providing higher load capacity. The 68xx series (6800–6806) is a thin-section series with a smaller OD and width, suited for space-constrained designs. The 69xx series (6900–6906) is also a thin-section series, slightly wider than 68xx. The 6xx miniature series (604–609, 624–628, 683–688) covers very small bore sizes from 3 mm to 9 mm.
