LFR5301KDD-10 12x42x19mm U-Groove Track Roller Bearing Track BearingLFR5301KDD 10 U Groove Track Roller Bearing 12mm ID 42mm OD 10mm Groove Diameter The LFR5301KDD 10 is a U groove track roller bearing designed for smooth, guided movement along round shafts or rails. With a 12mm inner diameter and 42mm outer diameter, it features a 10mm U groove for precision tracking, making it ideal for automation equipment, sliding systems, and linear motion assemblies. Type: U groove track roller bearing Inner diameter (dw): 12mm