Miniature Ball Bearing Bearing Industry Number 188 Bore Diameter 1/4 in Closure Open Outer Ring Width 0.125 in Outside Diameter 1/2 in Ring Material Stainless Steel System of Measurement Inch Cage Material Steel Cage Type Ribbon Dynamic Radial Load Capacity 242.8057 lbf Extended Inner Ring Yes Extended Inner Ring Width 0.187 in Fillet Radius 0.0059 in Finish Chrome Plated Flange Type Non-Flanged Includes Retaining Ring No Lubricant Material Oil