1. Product Overview UYF 204 2S four-bolt square cast iron flange bearing unit, matched with YAR204-2S eccentric lock insert bearing with single-side extended inner ring. Double-sided 2S thickened NBR double lip rubber contact seals block fine dust, water vapor and minor debris. Eccentric locking collar tightly clamps the extended inner ring for stable one-way continuous rotation. Spherical outer ring provides ±2.5° self-alignment to offset shaft assembly misalignment. Pre