6904dducm nsk6904DDU d 20 mm Bore diameter D 37 mm Outside diameter B 9 mm Width r (min.) 0. 3 mm Chamfer dimension d1 34 mm Outside diameter of inner ring D1 24 mm Bore diameter of outer ring Cr 7000 N Basic dynamic load rating C0r 3700 N Basic static load rating Grease 12000 min 1 Grease lubrication da (min.) 22 mm Diameter of shaft abutment (min) da (max.) 24 mm Diameter of shaft abutment Da (max.) 35 mm Diameter of housing abutment ra (max.) 0. 3 mm Radius of