LFR5308-50-2RS 40mm ID x 50mm U-Groove Sealed Track Roller BearingLFR5308 50 2RS U Groove Guide Bearing 50mm Heavy duty track roller for guided linear motion The LFR5308 50 2RS is a U groove guide bearing built for precision tracking along round rails or guideways. With a strong 40mm inner diameter and a deep 50mm groove, its made to handle high loads while rolling smoothly through demanding applications. Sold as one bearing. U Groove diameter: 50mm Inner diameter: 40mm Outer max diameter: 110mm Width: 46mm Load