Full Ceramic Miniature Ball Bearing 689-2RS ZrO2 9x17x5mm Double Rubber Sealed 2RS High Precision PTFE Cage Low Friction for Micro Motors CNC Robotics Medical Devices Suitable For Precision Machinery Applications And Smooth Low Noise Operation
✔️ 9x17x5mm full ceramic bearing, zirconia balls, PTFE cage, 1 pc
This is a full ceramic miniature ball bearing featuring zirconia balls and ceramic races. It’s designed for high-speed, low-friction motion in compact assemblies and is commonly used in precision instruments, optics, robotics, and micro-mechanical systems where non-magnetic, corrosion-resistant performance is key.
✅ inner diameter: 9 mm
✅ outer diameter: 17 mm
✅ width: 5 mm
✅ ball material: zirconia ceramic (ZrO2)
✅ cage material: PTFE (polytetrafluoroethylene)
✅ seal: 2RS (two rubber seals)
💡 What is a ceramic miniature ball bearing used for? Ceramic bearings are handy in tight spots where you need smooth, reliable motion and zero magnetic interference. - high-speed rotation and low friction - non-magnetic and corrosion resistant in harsh environments - lightweight and long life in micro machinery - precise positioning in optics and robotics