LFR5201KDD 12mm ID x 10mm U-Groove Track Roller Bearing LFR5201-10KDDLFR5201 10KDD U Groove Guide Bearing 12mm ID Track Roller 10mm U Profile Fit The LFR5201 10KDD is a precision U groove guide bearing designed to ride along round rails or V tracks for smooth linear motion. With a 12mm inner diameter and compact profile, it's ideal for CNC systems, sliding mechanisms, and motion guides that require accurate tracking and durability. Inner diameter: 12mm Shaft diameter fit (dw): 10mm Outer diameter: 35mm Groove depth