1. Product Overview UCP310 is heavy-duty two-bolt pillow block bearing unit, assembled by P310 cast iron housing and UC310 spherical outer ring insert bearing, standard matching shaft bore size 50mm. Model Code Explanation: UC: Insert bearing with spherical outer surface deep groove ball structure, widened inner ring with double set screw locking structure P: Two-bolt vertical pillow block cast iron housing 310: Heavy-duty 300 series mounted bearing, applicable shaft diameter