15-Pack Bearings 6004-2rs Full Ceramic Si3N4 Bearing 20x42x12mm

Pack of 15 Full Ceramic Ball Bearings 6004-2rs Sealed
✔️ Specs Include 20mm Bore 42mm OD 12mm Wide PTFE Cage

This package contains fifteen sealed units designed for demanding mechanical projects. They prevent rust in humid conditions while reducing noise levels.

✅ Silicon Nitride ceramic provides extreme hardness and heat resistance
✅ Double rubber seals stop contaminants from entering the bearing area
✅ PTFE cage ensures low friction movement during operation cycles

💡 Why do mechanics pick ceramic balls over metal components?
Silicone ceramics stay cool which makes them highly handy for speed.
- Lower mass reduces load stress on connected shafts efficiently
- Chemical stability resists acids commonly found in harsh environments