3-1/4" Bearing UCF-217-52 + 4-Bolt Flanged Housing MountedUCF 217 52 Four Bolt Flange Bearing Unit Set Screw Lock 3 1 4" Inner Diameter Heavy Duty UC217 52 Insert The UCF 217 52 is a robust four bolt flange mounted bearing unit built for heavy duty industrial applications. Featuring a 3 1 4" inner diameter and set screw locking system, it offers secure shaft grip and easy alignment with its solid F217 housing. Ideal for conveyor systems, rotating drums, and large industrial machinery. Type: 4 bolt flange