Miniature Ball Bearing Bearing Industry Number R2A Bore Diameter 1/8 in Closure Double Shielded For Environment Oily/Greasy Outer Ring Width 0.171 in Outside Diameter 1/2 in Ring Material Alloy Steel System of Measurement Inch ABEC Rating 1 Ball Material Alloy Steel Ball Material Grade AISI 52100 Bore Diameter Tolerance +0/-0.0003 in Cage Type Shielded Dynamic Radial Load Capacity 254 lbf Flange Diameter Not Applicable Flange Thickness Not Applicable Flange Type Non-Flanged