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Ceramic bearings can be categorized into three primary material compositions:
Bearings with Cages: Standard cage material is PTFE. Alternatives include GRPA66-25, PEEK, PI, SUS316, SUS304, and Brass (Cu).
Full-Complement Bearings: Designed without cages for extreme conditions, available in Zirconia, Silicon Nitride, and Composite types.
All-Ceramic Bearings: Inner ring, outer ring, and rolling elements are all made of ceramic.
Hybrid Ceramic Bearings: Only rolling elements are ceramic balls (Zirconia or Silicon Nitride), paired with steel rings.
Low coefficient of thermal expansion prevents expansion in high-temperature environments. Standard bearings cap at ~160°C, whereas ceramic ball bearings withstand temperatures exceeding 220°C.
Featuring self-lubricating properties and low friction coefficients, rotational speeds reach more than 1.5 times that of conventional bearings, ideal for high-speed spindles.
Functions normally even if grease dries up, preventing premature failure. Tests show operational service life is 2 to 3 times longer than standard conventional bearings.
Ceramic balls are complete electrical insulators. Using them prevents electrical current transfer between inner and outer rings, allowing safe operation in conductive environments.
| Item | Specification |
|---|---|
| Material | Full ZrO₂ zirconia ceramic (with 5% Y₂O₃ stabilizer); optional PTFE/ceramic cage |
| Color | Natural white (ceramic body); no discoloration under high temperature |
| Standard Size | 608 (8x22x7mm) – Universal for skateboards & inline skates; custom sizes available |
| Vickers Hardness | ≥ 1200 HV |
| Density | 6.0 - 6.1 g/cm³ |
| Operating Temp Range | -50℃ to 220℃ (stable without deformation or cracking) |
| Friction Coefficient | ≤ 0.008 (under dry operation; lower with lubrication) |
| Corrosion Resistance | Resistant to water, sweat, saltwater, and common skateboard cleaners |
| Surface Finish | Mirror-polished (Ra ≤ 0.02 μm) for smooth glide |
| Sealing Type | Rubber/ceramic seals (dust-proof, water-resistant; easy to disassemble for maintenance) |
| Lubrication | Silicone-based lubricant for high-temperature resistance; can operate dry in short term |
| Packaging | 8pcs/set (standard skateboard configuration) with protective box; 50sets/carton |
