6811 ddu nsk6811DDU d 55 mm Bore diameter D 72 mm Outside diameter B 9 mm Width r (min.) 0. 3 mm Chamfer dimension d1 68. 8 mm Outside diameter of inner ring D1 59 mm Bore diameter of outer ring Cr 9700 N Basic dynamic load rating C0r 8500 N Basic static load rating Grease 4800 min 1 Grease lubrication da (min.) 57 mm Diameter of shaft abutment (min) da (max.) 59 mm Diameter of shaft abutment Da (max.) 70 mm Diameter of housing abutment ra (max.) 0. 3 mm Radius