FYH Bearing UCF309 45mm Square Flanged Mounted BearingsUCF309 FYH Bearing Square Flanged Mounted Bearing Cylindrical bore (with set screws) 45mm Inner Diameter This heavy duty four bolt flange unit has a round cartridge on the backside of the flange which allows for precise mounting and alignment. Applications are Rotating drum, rotating roller and when precise mounting accuracy is required. Item: UCF309 Bearing Type: Four bolt Flanged Bearing Bolt Size: M16 Basic Dynamic Load (Cr): 48. 900 N Basic Static