LM4UU Linear Ball Bearing Kit for 3D Printers 4mm Bore 8mm OD 12mm Length 2 Pack Low Friction Guide Bushings for Ultra Smooth Movement on Printer Rails and Linear Motion Systems

Two-Pack 4mm Bore Linear Ball Bearing Kit for 3D Printers
✔️ 2 pack, 4mm bore, 8mm OD, 12mm length, low friction, smooth motion

These low friction linear bearings are built for 3D printers and small CNC setups, offering precise, quiet movement along shafts in printer rails and linear guides.

Dimension	Millimeters	Inches
Inner diameter	4	0.16
Outer diameter	8	0.31
Length	12	0.47

✅ Inner diameter: 4 mm (0.16 in)
✅ Outer diameter: 8 mm (0.31 in)
✅ Length: 12 mm (0.47 in)
✅ Pack size: 2 pieces

💡 What is a pillow block bearing used for in linear motion systems?
Pillow blocks provide sturdy shaft support and keep alignment in moving parts for smooth operation.
- pillow block bearing use cases for printers and CNCs
- reduces vibration and wear in compact motion systems
- easy to install on standard shafts