The ball bearing flange unit has capacity for higher speeds and allows for minor misalignment. It generates little friction and provides shaft support for high precision applications. The 4-bolt, square flanged unit is the standard in the industry. Martin Ball Bearing Flange Unit, Round Bore, Series: TEB, 3 in Bore, 6 in Bolt Center-to-Center Length, 3/4 in Diameter Bolt Circle, 4-Bolt Flange Mounting, 7-3/4 in Overall Length/Diameter, 3-1/8 in Overall Depth, 7-3/4 in Overall Height, Cast Steel Bearing, Protective Coated