Radial Ball Bearing Bearing Industry Number 6306 Bore Diameter 30 mm Closure Double Shielded For Environment Oily/Greasy Outer Ring Width 19 mm Outside Diameter 72 mm Ring Material Alloy Steel System of Measurement Metric Cage Material Steel ABEC Rating 1 Ball Material Alloy Steel Ball Material Grade AISI 52100 Bore Diameter Tolerance +0/-0.1 mm Dynamic Radial Load Capacity 6 000 lbf Includes Retaining Ring No Lubricant Material Polyrex EM