4 By 8 By 2.5 Millimeter Shielded Ball Bearing In Chrome Steel With Dual Metal Shields For Dust Protection Inner Diameter 4mm Outer Diameter 8mm Width 2.5mm Ideal For Precision Small Machinery DIY Projects And Hobby Robotics

This shielded metric miniature ball bearing is built for compact motion in tight spaces. It's a handy part in small machines such as RC models, 3D printers, linear slide units, and precision gearboxes, delivering reliable radial support with pre-lubrication. Note: ceramic ball options exist if you need even smoother, lower-friction performance, but this version uses chrome steel for durability.

✅ Shielding: double metal shields resist dust and contamination
✅ Size: bore 4 mm, outer diameter 8 mm, width 2.5 mm (4x8x2.5 mm)
✅ Material: chrome steel for durability and reliable load handling
✅ Lubrication: pre-lubricated grease for immediate operation
✅ Quantity: 1 bearing

💡 What is a shielded miniature ball bearing used for in compact machinery?

This handy bearing shields dust and reduces friction in tight spaces.

- Handy for small machines in hobby robotics
- Reduces wear by keeping contaminants out
- Pre-lubricated design minimizes maintenance