Miniature Ball Bearing Bearing Industry Number 188 Bore Diameter 1/4 in Closure Double Shielded For Environment Caustic Chemical Food and Beverage Pharmaceutical Poultry Outer Ring Width 0.187 in Outside Diameter 1/2 in Ring Material Alloy Steel System of Measurement Inch Cage Material Stainless Steel ABEC Rating 1 Cage Material Grade 304 Cage Type Shielded Dynamic Radial Load Capacity 88 lbf Flange Diameter Not Applicable Flange Thickness Not Applicable