Miniature Ball Bearing Bearing Industry Number 188 Bore Diameter 1/4 in Closure Double Shielded Outer Ring Width 0.187 in Outside Diameter 1/2 in Ring Material Stainless Steel System of Measurement Inch ABEC Rating 1 Cage Type Shielded Dynamic Radial Load Capacity 88 lbf Flange Diameter 0.547 in Flange Thickness 0.045 in Flange Type Flanged Includes Retaining Ring No Lubricant Material Multitemp Grease