Si3N4 Ceramic Bearing 4x8x3 Shielded Miniature Deep Groove Ball Bearing With Ceramic Balls, Chrome Steel Race, Double Metal ZZ Shields For Dust Protection, Pre Lubricated Grease Ready To Roll Right Out Of The Box

These compact bearings use ceramic Si3N4 balls inside chrome steel races and come shielded on both sides to protect against dust. Ideal for micro robotics, CNC hobby projects, and small precision gearboxes where clean, smooth rotation matters.

✅ Bore 4 mm, outer diameter 8 mm, width 3 mm
✅ Balls: Si3N4 ceramic for low weight and wear
✅ Races: chrome steel for rigidity and durability
✅ Shields: double metal shields (ZZ) keep dust out
✅ Pre-lubricated with grease for immediate use

💡 What is a pillow block bearing used for in small machinery? This handy choice supports rotating shafts in tight spaces and helps keep assemblies aligned.
- Supports rotating shafts in tight spaces
- Improves alignment and load distribution in compact systems
- Ceramic variants offer lower weight and friction
- Useful in hobby robotics and small automation projects