638 Open Miniature Ball Bearing 8x28x9mm Chrome Steel Deep Groove Bearing for small motors, hobby gearboxes and light industrial equipment needing smooth rotation and reliable pre greased performance

638 Open Miniature Ball Bearing 8mm x 28mm x 9mm
✔️ 638 Deep Groove Open Ball Bearing 8x28x9mm

This miniature deep groove ball bearing is used in small motors, rollers, and compact mechanical assemblies where low friction and free spinning are needed. It is handy for light duty applications that benefit from an open design and factory grease lubrication.

✅ Pack size: 1 bearing
✅ Bearing type: deep groove ball bearing
✅ Inside diameter: 8mm
✅ Outside diameter: 28mm
✅ Width: 9mm
✅ Material: 52100 chrome steel
✅ Closures: open design
✅ Lubrication: pre greased
✅ Dynamic load rating: 600 N
✅ Static load rating: 265 N
✅ Limiting speed with grease: 24000 RPM

💡 Why use an open miniature deep groove ball bearing in compact rotating systems?
Open bearings are chosen when low drag and easy relubrication are more important than contamination sealing.

• Open raceway allows smooth rotation with minimal friction

• Greased design supports steady operation at moderate speeds

• Chrome steel construction improves wear resistance

• Compact size fits tight housings in small mechanical builds

A solid option for light duty motion setups that need smooth rolling and simple maintenance in tight spaces.