Radial Ball Bearing, Bearing Industry Number 6311, Bore Diameter 55 mm, Closure Single Shielded, Outer Ring Width 29 mm, Outside Diameter 120 mm, Ring Material Alloy Steel, System of Measurement Metric, Cage Material Steel, ABEC Rating 1, Ball Material Alloy Steel, Bore Diameter Tolerance +0/-0.015 mm, Dynamic Radial Load Capacity 103,900 N, Fillet Radius 2 mm, Includes Retaining Ring No, Lubricant Material Quaker Ferrocote