30-Pack Full Ceramic 639-2RS ZrO2 Miniature Ball Bearings 9x30x10mm With PTFE Cage High-Precision Ceramic Bearings For Hobby RC Drones CNC 3D Printing And Jewelry Making Low Friction Corrosion-Resistant Long-Lasting

Full Ceramic 639-2RS Mini Bearing 9x30x10mm, 30 Pack
✔️ Sealed full ceramic 639-2RS bearings, zirconia balls, PTFE cage

These compact ceramic bearings use zirconia balls and full ceramic races for exceptional hardness and low friction. They excel in precision instruments, robotics, and hobby CNC where heat, moisture, and corrosion resistance matter.

✅ Inner diameter: 9 mm
✅ Outer diameter: 30 mm
✅ Width: 10 mm
✅ Ball material: Zirconia ceramic (ZrO2) balls
✅ Races material: Zirconia (ZrO2) ceramic
✅ Cage: PTFE (Polytetrafluoroethylene)
✅ Type: Full ceramic bearing, 639-2RS
✅ Pack size: 30 bearings

💡 What is a full ceramic bearing used for in precision machinery? They’re handy in high-speed, low-friction setups. - High-speed spindles and precision equipment - Resistance to heat, moisture, and corrosion - Clean-room friendly, low contamination risk