15 Pack Full Ceramic Ball Bearings 6004-2RS Si3N4 20x42x12mm Sealed High Precision Bearings for Quiet Smooth Operation in Machinery RC Models and Industrial Applications Great for Demanding Precision Work

This is a pack of 15 full ceramic bearings, built as sealed ball bearings using Si3N4 inner and outer races and balls, with a PTFE cage. They’re ideal for high-speed, corrosion-resistant use in precision machinery, robotics, and lab equipment.

✅ Bearing type: full ceramic ball bearing 2RS sealed
✅ Inner diameter: 20 mm
✅ Outer diameter: 42 mm
✅ Width: 12 mm
✅ Material: Si3N4 ceramic; Cage: PTFE
✅ Pack size: 15 bearings

💡 What is a ceramic bearing used for in precision machinery? This handy guide explains its role.
- Improve wear resistance in high-speed shafts and spindles
- Offer corrosion resistance in tough environments
- Lower friction for cooler operation in compact systems