Ucf311 D1 NskUCF311D1 Bearing UC311D1 Bearing Housing F311D1 Housing d 55 mm Bore diameter L 185 mm Overall length J 140 mm Distance between attachment bolts N 23 mm Diameter of attachment bolt hole A2 30 mm Flange width A1 20 mm Flange width A 52 mm Base width A0 71 mm Overall width B,B1,B2 66 mm Width of inner ring S 25 mm Distance from Opposite side face of locking device to raceway centre G M20 Bolt size Cr 71. 5 kN Basic dynamic load rating C0r 45 kN Basic