1. Product Overview LYF215-2S four-bolt square cast iron flange bearing unit, matched with YEL215-2S double extended inner ring eccentric lock insert bearing. Double-sided thickened 2S NBR double-lip contact rubber seals block fine dust, water vapor and light flying debris. Eccentric locking collar tightly clamps the double extended inner ring to maintain stable one-way continuous rotation under long heavy vibration. Spherical outer ring provides ±2.5° self-alignment to