1. Product Overview LSF 206 2F four-bolt square grey cast iron flange bearing unit, matched with SU206-2F double set screw insert bearing. Double-sided 2F composite sealing structure combines centrifugal metal flinger and NBR rubber lip for two-stage pollution prevention. Two symmetric M8 set screws evenly lock the inner ring, supporting stable forward and reverse rotation under alternating loads. Spherical outer ring delivers ±2.5° self-alignment to compensate shaft assembly