UC217-52 Black Oxide Plated Axle Bearing Insert 3 1/4" MountedUC217 52 Black Oxide Plated Axle Bearing Insert 3 1 4" Inch Inner Diameter UC217 52 Black Oxide Plated Axle Bearing Insert, Bearing is standard duty, bearing is Wide inner ring with spherical outer ring, Bearing is relubrication groove with oil hole on set screw side, bearing is nylon patched class 3A set screw, Standard seal is R Seal. UC217 52 Black Bearing Insert Black Oxide Plated Axle Bearing Insert Shaft Diameter: 3 1 4" Inch Dynamic Load