1. Product Overview LSF 210 2F square four-bolt cast iron flange bearing assembly, matched with SU210-2F double set screw insert bearing. Equipped with double-sided 2F composite sealing combining centrifugal metal flinger and NBR rubber lip to realize two-stage mud, dust and splash isolation. Two symmetric M10 set screws lock the inner ring evenly, providing stable clamping force for frequent forward and reverse rotation under continuous heavy vibration. Spherical outer ring