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 Not Applicable Flange Thickness Not Applicable Flange Type Non-Flanged Includes Retaining Ring No Lubricant Material Multitemp Grease