Silicon Nitride Full Ceramic Ball Bearing 11x21x5mm With PTFE Cage High Precision Ceramic Bearing Inner Diameter 11mm Outer Diameter 21mm Width 5mm Lightweight And Durable For Precision Machinery

Full Ceramic Silicon Nitride Bearing 11x21x5mm
✔️ ID 11 mm, OD 21 mm, width 5 mm; Si3N4 ceramic

The full ceramic bearing is made from silicon nitride (Si3N4) with a PTFE cage, delivering low friction and high rigidity. This compact 11x21x5 mm unit is commonly used in precision robotics, CNC equipment, linear slide units, and lab instrumentation where high heat resistance and wear life matter. Pack size: 1 bearing.

✅ Size: 11 mm ID, 21 mm OD, 5 mm width
✅ Material: Si3N4 ceramic balls and races
✅ Cage: PTFE (Polytetrafluoroethylene)
✅ Quantity: 1 bearing
✅ Type: full ceramic bearing

💡 What is a ceramic bearing used for?

Ceramic bearings like this silicon nitride unit are handy for high-speed, precise motion with low friction and long wear life.

- High-speed operation for precision machinery
- Low friction in robotics and CNC applications
- Superior wear resistance and corrosion tolerance