1. Product Overview The 502312 interchange RN312 is a single row cylindrical roller bearing without inner ring, open type without sealing structure, standard dimension 60×113×31mm. It features ultra-large radial load capacity and compact outer ring structure, directly matches quenched and ground shaft surface as inner raceway. Brass cage stabilizes roller operation, widely applied in agricultural machinery, air compressors, cranes, excavators and heavy industrial transmission