638 Full Ceramic Ball Bearings 8x28x9mm, 30 Pack, Zirconia ZrO2 Miniature Bearings with PTFE Cage, High-Performance Bearings for Precision Hobby, CNC, Robotics, and Medical Equipment

30-Pack 8x28x9mm Full Ceramic Zirconia Bearings
✔️ 30 pcs pack of 8x28x9 mm full ceramic Zirconia bearings

638 Full Ceramic Bearings with Zirconia balls and ZrO2 races, plus a PTFE cage, delivering minimal friction, superior wear resistance, and chemical stability. This setup suits lab gear, precision robotics, and CNC or automation projects requiring non-magnetic, long-life action.

✅ Inner diameter 8 mm, outer diameter 28 mm, width 9 mm
✅ Ball material: Zirconia Ceramic (ZrO2)
✅ Cage material: PTFE (Polytetrafluoroethylene)
✅ Races material: Zirconia Ceramic (ZrO2)
✅ Pack size: 30 bearings per pack

💡 What is a ceramic bearing used for in precision equipment? Ceramics excel where low friction, non-magnetic operation, and chemical resistance matter.
- handy in clean-room setups and chemical processing lines
- handy in high-speed, non-magnetic drives
- handy where long life and corrosion resistance are key