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When standard steel bearings corrode, seize, or demand constant re-greasing in wet, chemical, or high-temperature environments, engineers and makers pay the price in downtime and maintenance costs. Whether you are building food-processing equipment, marine machinery, agricultural conveyors, or precision CNC fixtures, you need a bearing insert that simply keeps running. These UC-series zirconia ceramic self-lubricating bearing inserts are engineered for exactly those demanding conditions.
Each insert is constructed from zirconia ceramic (ZrO₂) rolling elements paired with a stainless or corrosion-resistant housing, delivering a self-contained, grease-free bearing unit. Available in UC203 through UC210, the bore diameters range from 17 mm (0.67 in) to 50 mm (1.97 in), covering the most common metric shaft sizes used in industrial and maker applications. The self-lubricating ceramic construction eliminates the need for external grease fittings.
Typical use cases include food and beverage conveyor lines where washdown cycles make steel bearings impractical, marine deck equipment exposed to saltwater spray, chemical processing pumps requiring non-reactive bearing materials, and CNC router or laser-cutter axis supports where low friction and dimensional stability are critical for repeatability.
| Series | UC203 / UC204 / UC205 / UC206 / UC207 / UC208 / UC209 / UC210 |
|---|---|
| Bore Diameter (Inner Diameter) | 17 mm – 50 mm (0.67" – 1.97"); see variant options |
| Rolling Element Material | Zirconia Ceramic (ZrO₂) |
| Lubrication Type | Self-lubricating (grease-free) |
| Locking Method | Set screw on inner ring |
| Housing Compatibility | Standard UC-series (P2xx, F2xx, FL2xx, FS2xx) |
| Operating Temperature | Typically –40 °C to +200 °C (–40 °F to +392 °F) |
| Corrosion Resistance | Resistant to acids, alkalis, and saltwater |
| Outer Diameter | See variant options |
| Width | See variant options |
| Dynamic Load Rating (C) | See variant options |
| Static Load Rating (C₀) | See variant options |
| Quantity per Order | 1 PCS |
Match the model number to your shaft diameter: UC203 fits 17 mm shafts, UC204 fits 20 mm, UC205 fits 25 mm, UC206 fits 30 mm, UC207 fits 35 mm, UC208 fits 40 mm, UC209 fits 45 mm, and UC210 fits 50 mm. Select the variant above that corresponds to your shaft size. All models share standard UC-series outer dimensions and are interchangeable with P2xx and F2xx housings.
Zirconia ceramic bearing inserts carry radial and axial loads comparable to equivalent-size steel UC bearings in most light-to-medium duty applications. The ceramic rolling elements have high compressive strength and hardness (typically HV 1200+). For very heavy shock loads or extreme radial forces, consult the specific dynamic load rating (C) for your chosen model size, which varies by bore diameter.
Zirconia ceramic (ZrO₂) is highly resistant to most acids, alkalis, chlorides, and saltwater — environments that rapidly corrode standard carbon steel or even 440C stainless steel bearings. This makes them well-suited for food processing washdown, marine, chemical, and outdoor agricultural applications where moisture and chemical exposure are unavoidable.
Yes. These UC-series inserts conform to standard dimensional specifications and are designed as drop-in replacements for existing UC-series inserts in P2xx pillow block housings, F2xx four-bolt flange housings, FL2xx two-bolt flange housings, and FS2xx three-bolt flange housings. No housing modification is required.
No. The self-lubricating design incorporates a solid lubricant that eliminates the need for external grease fittings or periodic re-greasing. This is particularly valuable in food-safe environments where grease contamination is a concern, or in hard-to-reach locations where regular maintenance is impractical.
Zirconia ceramic rolling elements maintain their dimensional stability and mechanical properties across a wide temperature range, typically from –40 °C to +200 °C (–40 °F to +392 °F). This makes them suitable for both cold-storage conveyor systems and moderately elevated-temperature industrial machinery, outperforming polymer or PTFE-based self-lubricating alternatives at higher temperatures.
Slide the insert onto the shaft until it reaches the desired position. Tighten the set screws on the inner ring against the shaft using the appropriate hex key — do not overtighten, as this can deform the shaft. Seat the insert into the housing bore and secure the housing to its mounting surface. No press fit or keyway is required for standard installations.
