Thirty Pack Sealed Full Ceramic 6801-2RS Ball Bearings Si3N4 12 mm Inner Diameter 21 mm Outer Diameter 5 mm Width for Industrial and Commercial Machinery High Performance Ceramic Bearings

Sealed full-ceramic bearing 12x21x5mm pack of 30 Si3N4
✔️ 12x21x5 mm bore (ID 12mm, OD 21mm, width 5mm), Si3N4

A compact, high-performance bearing built from ceramic Si3N4, designed for dry, high-temperature operation in precision machinery. This 30-pack is ideal for maintenance, replacement, or batch installs in CNCs, robotics, and lab equipment where reliability and corrosion resistance matter.

✅ Bearing type: sealed full ceramic ball bearing with Si3N4 races and PTFE cage
✅ Size: 12x21x5 mm (ID 12 mm, OD 21 mm, width 5 mm)
✅ Material: balls and races Si3N4 ceramic; cage PTFE
✅ Pack: 30 bearings per order
✅ Seal: RS/2RS style for moisture and contamination resistance

💡 What is a sealed full ceramic bearing used for in precision machinery? Here's a handy quick guide: - High-precision, low-friction performance for CNC spindles and measurement gear - Excellent corrosion resistance and long life in dry or high-temperature settings - Minimal lubrication reliance due to ceramic surfaces, reducing maintenance