GJP 3/4" 2 Bolt Flange Bearing Unit UCFL204-12, it has the features of Two bolt, flanged mounted bearing units, cast iron material housing, set screw type, they are designed by GJP to allow for the static mis-alignment of the bearing inside the housing because of the spherical shape of the outer diameter of the bearing insert and the concave shape of the inner diameter of the housing. This design allows the bearing unit to adjust for initial shaft mis-alignment which helps reduce abnormal bearing load. The allowable aligning angle of standard ball bearing units is 3o, while units with covers is 1o. Note, this flanged Pillow Block Bearing is not designed to swivel dynamically