4mm Bore Bearing - 13mm Pulley U-Groove Track Roller Bearing 4x13x4mm

4mm U-Groove Shielded Track Roller Bearing
✔️ Pulley Guide Roller 4mm x 13mm x 4mm

This U-groove pulley bearing gives you smooth, steady tracking for sliding doors, guides, 3D printers, and small motion assemblies. It comes with double metal shields to help keep dust out, and the compact 4mm bore makes it a handy fit for lightweight guide rails and cable systems. Sold as one bearing.

✅ Inner diameter 4mm
✅ Outer diameter 13mm
✅ Width 4mm
✅ U-groove profile
✅ Double metal shields (ZZ)
✅ Metric standard sizing
✅ One bearing included
*0.5mm dimension tolerance

💡 Why use U-groove track bearings in linear guide setups?
The groove keeps the bearing centered on a rail or cable for cleaner motion.
- Helps reduce side-to-side wander
- Shields keep debris out for smoother rolling
- Handy for sliding mechanisms, guides, and compact motion systems

This 4mm U-groove bearing gives your project clean, reliable tracking with a simple shielded design ready for everyday motion tasks.