1.Product Overview UYF211-2S four-bolt square cast iron flange bearing unit, matched with YAR211-2S eccentric lock insert bearing with single-side extended inner ring. Double-sided thickened 2S NBR double-lip rubber contact seals block fine dust, water vapor and light debris. Eccentric locking collar tightly clamps the extended inner ring for stable one-way continuous rotation under heavy vibration. Spherical outer ring provides ±2.5° self-alignment to offset shaft assembly