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When standard steel bearings corrode, seize, or interfere with sensitive electronics, engineers and makers reach for a ceramic alternative. These ZrO2 zirconia ceramic deep groove ball bearings are designed for hobbyists, engineers, and precision builders who need reliable rotation in wet, chemical, or magnetically sensitive environments — without the maintenance overhead of steel.
Each bearing is constructed entirely from zirconia (ZrO2) ceramic — balls, inner race, and outer race — with no metallic components. Available in five standard miniature sizes: 604 (ID 4mm × OD 12mm × THK 4mm / 0.16" × 0.47" × 0.16"), 605 (5×14×5mm / 0.20"×0.55"×0.20"), 606 (6×17×6mm / 0.24"×0.67"×0.24"), 607 (7×19×6mm / 0.28"×0.75"×0.24"), 608 (8×22×7mm / 0.31"×0.87"×0.28"), and 609 (9×24×7mm / 0.35"×0.94"×0.28"). Order from 1 piece up to 50 pieces per model.
Typical use cases include RC car and drone wheel axles requiring non-magnetic bearings, food processing equipment where corrosion resistance is mandatory, medical and laboratory instruments sensitive to metal contamination, and precision DIY spindles or fidget mechanisms where low rolling resistance and long service life matter.
| Material | Zirconia (ZrO2) — full ceramic (balls, inner race, outer race) |
|---|---|
| Bearing Type | Deep Groove Ball Bearing (open / unshielded) |
| Available Models | 604, 605, 606, 607, 608, 609 |
| Inner Diameter (ID) | 4 mm / 5 mm / 6 mm / 7 mm / 8 mm / 9 mm (see variant options) |
| Outer Diameter (OD) | 12 mm / 14 mm / 17 mm / 19 mm / 22 mm / 24 mm (see variant options) |
| Thickness (THK) | 4 mm / 5 mm / 6 mm / 6 mm / 7 mm / 7 mm (see variant options) |
| Packing Quantity | 1 / 3 / 5 / 10 / 20 / 30 / 50 Pcs (see variant options) |
| Operating Temperature | Approximately −50 °C to +400 °C (−58 °F to +752 °F) |
| Magnetic Properties | Non-magnetic |
| Electrical Conductivity | Non-conductive |
| Corrosion Resistance | Resistant to most acids, alkalis, and saltwater |
| Lubrication | Dry / unlubricated (suitable for dry or self-lubricating applications) |
Match the model number to your shaft diameter (inner diameter) and housing bore (outer diameter). The 604 fits a 4 mm shaft, 605 a 5 mm shaft, 606 a 6 mm shaft, 607 a 7 mm shaft, 608 an 8 mm shaft, and 609 a 9 mm shaft. Always verify the outer diameter and thickness against your housing before ordering — dimensions are listed in the Technical Specifications table above.
ZrO2 zirconia ceramic has a flexural strength of approximately 900–1200 MPa and hardness around 8–8.5 on the Mohs scale, making it significantly harder than steel. However, ceramic is more brittle under sharp impact loads compared to steel. These bearings are well-suited for radial loads in moderate-speed applications such as RC vehicles, drones, spindles, and instruments. Avoid applications with heavy shock or axial impact loads.
Zirconia ceramic is chemically inert to most acids (including hydrochloric and sulfuric acid at moderate concentrations), alkalis, and saltwater. Unlike stainless steel bearings, ZrO2 bearings will not rust or corrode in wet or humid environments, making them a reliable choice for food processing, marine, and laboratory applications.
Yes. ZrO2 ceramic is fully non-magnetic and electrically non-conductive. These bearings produce no magnetic interference and no eddy currents, making them ideal for use near Hall-effect sensors, encoders, MRI-adjacent equipment, and high-frequency electronics where steel bearings would cause signal noise or energy loss.
These are open (unshielded) dry ceramic bearings and can be run without lubrication in many applications. If your application involves high speeds or elevated temperatures, a small amount of PTFE-based or ceramic-compatible dry lubricant can extend service life. Avoid petroleum-based greases in food-grade or chemical environments.
Yes — the 604 through 609 model numbers follow the same ISO dimensional standard as steel deep groove ball bearings. As long as the ID, OD, and thickness match your existing housing, these ceramic bearings are a drop-in replacement. Note that these are open bearings (no shields or seals), so confirm your application does not require a shielded (ZZ) or sealed (2RS) variant.
For prototyping or single-unit repairs, the 1-piece or 3-piece pack is the most cost-effective starting point. If you are building a batch of RC cars, drones, or instruments, the 10- or 20-piece packs offer a lower per-unit cost. For production runs or workshop stock, the 30- or 50-piece packs provide the best value per bearing.
