Full Ceramic Si3N4 Ball Bearing 9x30x10 mm Miniature Pack Of 20 Silicon Nitride Bearings For Precision Applications Low Friction High Durability Corrosion Resistant Non Magnetic Lightweight Industrial Grade

639-2RS Full Ceramic Si3N4 bearings are compact high-precision units made from silicon nitride with a PTFE cage. They deliver smooth, low-friction operation in robotics, instrumentation, and hobby machines needing durability and corrosion resistance.

✅ Inner bore: 9 mm
✅ Outer diameter: 30 mm
✅ Width: 10 mm
✅ Material: Si3N4 ceramic with PTFE cage
✅ Seals: 2RS

💡 What is a ceramic ball bearing used for in precision machinery? Ceramic bearings are a handy, reliable choice for high-speed, accurate motion in equipment. - Handy for high-speed, low-wear movement - Low friction and corrosion resistance from ceramic balls - PTFE cage reduces drag and aids maintenance - Great for hobbyists and light industrial setups