25 Pack Full Ceramic Ball Bearings 689 Si3N4 9x17x5mm With PTFE Cage High Precision Low Friction For Micro Machinery RC Models CNC Robotics And Hobby Projects Inner Diameter 9mm Outer Diameter 17mm Width 5mm For Smooth Operation

25-Pack Full Ceramic 689 Miniature Bearings 9x17x5mm
✔️ 25-pack full ceramic Si3N4 bearings, 9x17x5 mm size

These are 689 miniature bearings made from full ceramic Si3N4, offering high hardness, lightweight, and corrosion resistance. They’re ideal for precision hobby motors, micro gearboxes, robotics, and high-speed assemblies.

✅ Inner diameter: 9 mm
✅ Outer diameter: 17 mm
✅ Width: 5 mm
✅ Material: Si3N4 ceramic balls and races
✅ Cage: PTFE (Polytetrafluoroethylene)
✅ Type: 689 full ceramic bearing
✅ Pack size: 25 bearings in the set

💡 What is a ceramic ball bearing used for in precision miniature equipment and hobby motors? These bearings are handy for high speed, long life operation in small devices. - High hardness and wear resistance for micro drives - Lightweight design improves response time in small motors - Excellent corrosion resistance for moisture-prone environments - PTFE cages reduce friction and promote smooth operation