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When standard steel bearings corrode, seize, or interfere with sensitive electronics, engineers and makers reach for zirconia ceramic alternatives. These zirconia full ceramic thin section ball bearings are designed for cyclists, robotics builders, medical device technicians, and industrial maintenance professionals who need reliable rotation in wet, chemical, or magnetically sensitive environments.
Each bearing is manufactured from zirconia oxide (ZrO₂) ceramic throughout — races, balls, and retainer — with no metallic components. The thin-section profile keeps the cross-section compact relative to bore diameter. Available sizes span from 6700 (10×15×3 mm / 0.39"×0.59"×0.12") up to 6712 (60×75×7 mm / 2.36"×2.95"×0.28"), covering a wide range of shaft diameters. Select variants include a double-side seal option for added contamination protection.
Typical applications include bicycle bottom brackets and wheel hubs requiring corrosion-free thin section bearings, RC car and drone motor shafts where non-magnetic zirconia ceramic bearings reduce interference, and food processing or chemical handling equipment where stainless steel is insufficient and a full ceramic bearing replacement is required.
| Bearing Series | 6700 / 6701 / 6702 / 6703 / 6704 / 6705 / 6706 / 6707 / 6708 / 6712 |
|---|---|
| Material | Zirconia Oxide (ZrO₂) — full ceramic (races, balls, retainer) |
| Inner Diameter (ID) | 10 mm – 60 mm (varies by size; see variant options) |
| Outer Diameter (OD) | 15 mm – 75 mm (varies by size; see variant options) |
| Width / Height | 3 mm – 7 mm (varies by size; see variant options) |
| Seal Type | Open (standard) or Double-Side Seal (6700 variant) |
| Bearing Type | Thin-section radial ball bearing |
| Conductivity | Non-conductive (electrical insulator) |
| Magnetic Properties | Non-magnetic |
| Corrosion Resistance | Resistant to water, salt, mild acids and alkalis |
| Operating Temperature | See variant options |
| Load Rating | See variant options |
| Packing Quantity | 1 Pcs / 2 Pcs / 6 Pcs (size-dependent) |
Match the bearing number (6700, 6701, etc.) to your shaft diameter (ID) and housing bore (OD). The size format shown in the variant name is ID×OD×Width in millimeters — for example, 6702 (15×21×4 mm) fits a 15 mm shaft in a 21 mm housing bore with a 4 mm width. Measure your existing bearing or shaft with calipers before ordering.
The standard open bearings have no seals, allowing free lubricant flow and slightly lower drag — suitable for clean, dry, or already-lubricated environments. The Double Side Seal variant (available for the 6700 10×15×4 mm size) adds ceramic or polymer seals on both faces to block moisture, dust, and fine particles, making it the better choice for wet or contaminated conditions.
Zirconia ceramic has high compressive strength and hardness (Mohs ~8.5), and these bearings handle radial loads typical of their size class. However, ceramic is more brittle than steel under sharp impact loads. They are well-suited for steady radial loads in motors, wheels, and spindles, but may not be the best choice for applications with heavy shock loading. Check the load rating for your specific size variant before substituting.
Yes — zirconia oxide is highly resistant to corrosion from water, salt spray, mild acids, and alkaline solutions. Unlike steel or even stainless steel bearings, ZrO₂ ceramic does not rust or pit in marine or chemical environments. This makes these bearings a common choice for kayak pedal drives, underwater ROVs, food processing conveyors, and laboratory equipment.
Yes, the outer dimensions follow standard 6700-series metric sizing, so they fit the same housings and use the same installation tools as equivalent steel bearings. Use a bearing press or a correctly sized socket to press on the outer race only — never strike the inner race directly, as ceramic is more sensitive to point impact than steel.
Open variants benefit from a light application of PTFE-based or ceramic-compatible grease, especially in high-speed applications. Avoid petroleum-based greases that may degrade ceramic retainers over time. The Double Side Seal variant comes pre-lubricated from the factory. In fully submerged or wash-down environments, many users run open ceramic bearings dry, as ZrO₂ has inherently low friction and does not require lubrication the way steel does.
Order 1 Pc for a single repair or prototype test. Order 2 Pcs when replacing bearings in pairs (e.g., both sides of a wheel hub or motor shaft) — the 2-pack price per bearing is lower than buying two singles. The 6-pack option (available for the 6712 size) is suited for production runs, fleet maintenance, or stocking a spare set alongside an installation.
