Full Ceramic Si3N4 Ball Bearing 12x21x5mm With PTFE Cage, 14 Ceramic Balls, High-Precision Silicon Nitride Bearing For Low Friction, Corrosion-Resistant, High Rigidity And Durable Industrial Performance

12x21x5mm single piece Full Ceramic Bearing with Si3N4 Balls
✔️ 12mm bore, 21mm OD, 5mm width, PTFE cage, 14 Si3N4 balls

This full ceramic bearing uses silicon nitride balls and a PTFE cage, optimized for high-speed, low-friction operation in precision equipment and clean environments.

✅ Single bearing, 12 mm bore, 21 mm outer diameter, 5 mm width
✅ Open-ball design with 14 Si3N4 ceramic balls
✅ PTFE cage for low friction and corrosion resistance
✅ Dimensions: ID 12 mm, OD 21 mm, width 5 mm

💡 What is a full ceramic bearing used for in precision machinery and why choose Si3N4? This handy option shines in several ways: - High-speed performance with low friction - Excellent corrosion resistance for harsh environments - Lightweight, stable operation across temperature - Long service life in demanding equipment