1.Product Overview LSF211-2F square four-bolt cast iron flange bearing unit, matched with SU211-2F double set screw insert bearing. Double-sided 2F composite seal adopts metal flinger + NBR lip two-stage barrier to block mud, crop debris and cooling water splashes. Two symmetric M10 set screws clamp inner ring evenly, stable for frequent forward & reverse rotation under heavy vibration. Spherical outer ring offers ±2.5° self-alignment to compensate shaft assembly offset. Side