Radial Ball Bearing Bearing Industry Number 6304 Bore Diameter 20 mm Closure Double Sealed For Environment Caustic Chemical Food and Beverage Pharmaceutical Poultry Outer Ring Width 15 mm Outside Diameter 52 mm Ring Material Stainless Steel Seal Type Contact System of Measurement Metric Cage Material Stainless Steel ABEC Rating 1 Ball Material Stainless Steel Bore Diameter Tolerance +0/-0.01 mm Cage Material Grade 304 Dynamic Radial Load Capacity 2 864 lbf