20-Pack 638-2RS Full Ceramic Si3N4 Bearings 8x28x9mm Miniature

638-2RS Full Ceramic Ball Bearings
✔️ Si3N4 - 8mm ID - 28mm OD - 9mm Width

This 20-pack of 638-2RS full ceramic ball bearings is built with silicon nitride (Si3N4) for both the balls and races, delivering top-tier performance in corrosive, high-speed, or non-conductive environments. Commonly used in robotics, medical gear, and high-end industrial equipment.

✅ Pack size: 20 bearings
✅ Size: 8mm x 28mm x 9mm
✅ Type: Deep groove full ceramic bearing
✅ Balls: Silicon Nitride (Si3N4)
✅ Races: Silicon Nitride (Si3N4)
✅ Cage: PTFE (Teflon®-compatible)
✅ Closures: Rubber seals on both sides

💡 Why use full ceramic bearings in advanced applications?

1. Si3N4 ceramic is lighter, harder, and runs cooler than steel.

2. Corrosion-proof and non-magnetic - ideal for medical and cleanroom settings.

3. Handles higher speeds and extreme temps with minimal wear.

These bearings offer ultra-low friction and long-lasting durability for cutting-edge machines and demanding environments.