1.Product Overview LYF211-2F four-bolt square cast iron flange bearing unit, matched with YEL211-2F 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 debris and workshop water splashes. Eccentric locking collar tightly clamps double extended inner ring for stable single-direction rotation under long heavy vibration. Spherical outer ring provides ±2.5° self-alignment to