20-Pack 683ZZ Double-Shielded Sealed Ball Bearings 3mm x 8mm x 4mm, Deep Groove Miniatures for Motors, Roller Wheels, Office Equipment, Linear Slide Unit Repairs and Kits

20-Pack 683ZZ Double-Shielded 3mm x 8mm x 4mm Bearings
✔️ Inner 3mm bore, 8mm OD, 4mm width; high-carbon steel ABEC1

Pack of 20 small double-shielded deep groove ball bearings ideal for motors, roller wheels, office equipment, and linear slide units. Confirm sizes before ordering.

✅ Type: Deep groove double-shielded (ZZ) sealed ball bearing
✅ Size: Inner diameter 3mm x Outer diameter 8mm x Width 4mm
✅ Pack: 20 bearings per set for small motors, rollers, and kits
✅ Material & precision: Bearing steel, ABEC-1 tolerance for stable runs
✅ Use: High-speed operation, low friction, suitable for linear slide unit maintenance

💡 What is a sealed ball bearing used for in motors and linear slide units? Sealed or double-shielded bearings keep dirt out and retain lubrication for longer service life. Short answer: They provide protected low-friction rotation in tight assemblies. - Low-friction radial support and limited axial load handling in motors and gearboxes. - Keeps lubrication sealed for longer life in roller wheels, office equipment, and linear slide units. - Ideal for small-diameter high-speed applications and common 683ZZ or 3x8x4mm replacements.