Radial Ball Bearing Bearing Industry Number 6304 Bore Diameter 20 mm Closure Double Sealed Outer Ring Width 15 mm Outside Diameter 52 mm Ring Material Alloy Steel Seal Type Non-Contact System of Measurement Metric Cage Material Alloy Steel ABEC Rating 1 Application Radial and Thrust Load Application Bore Diameter Tolerance +0/-10 micron Dynamic Radial Load Capacity Not Available Includes Retaining Ring No Lubricant Material Grease