Miniature Ball Bearing Bearing Industry Number 684 Bore Diameter 4 mm Closure Double Shielded Outer Ring Width 4 mm Outside Diameter 9 mm Ring Material Stainless Steel System of Measurement Metric Cage Material Steel Cage Type Crown Ribbon Dynamic Radial Load Capacity 641 N Fillet Radius 0.1 mm Finish Chrome Plated Flange Diameter 10.3 mm Flange Thickness 1 mm Flange Type Flanged Includes Retaining Ring No Lubricant Material Grease