11.5x21x5 Full Ceramic Silicon Nitride Bearing With PTFE Cage 11.5mm Inner Diameter 21mm Outer Diameter 5mm Width High Precision Ceramic Ball Bearing For High Speed Low Friction And Corrosion Resistance

This full ceramic bearing uses silicon nitride (Si3N4) for both the balls and races, with a PTFE cage to minimize friction. It’s built for high-speed, dry-running operation in demanding robotics, aerospace, medical devices, and high-temperature assemblies where metal bearings risk corrosion or seizure.

✅ Size: 11.5mm ID, 21mm OD, 5mm width
✅ Material: Si3N4 ceramic balls and races
✅ Cage: PTFE for low friction and chemical resistance
✅ Package: 1 bearing

💡 What is a full ceramic silicon nitride bearing used for in high-precision machinery? This handy question helps buyers understand why ceramic bearings matter in precision motion systems. - High stiffness and low weight support precise positioning - Excellent thermal stability and corrosion resistance for harsh environments - Low friction operation reduces wear and heat in high-speed runs - Chemical inertness minimizes contamination in clean-room setups