1. Product Overview LEF218-2F four-bolt square cast iron flange bearing unit, matched with YEL218-2F double extended inner ring eccentric lock insert bearing. Double-sided 2F composite seal adopts metal flinger + NBR lip two-stage barrier to block mud, crop residues, heavy dust and cooling water splashes. Eccentric locking collar tightly clamps double extended inner ring for stable single-direction rotation under long heavy vibration. Spherical outer ring offers ±2.5° self