Miniature Ball Bearing, Bearing Industry Number R4A, Bore Diameter 1/4 in, Closure Double Shielded, For Environment Oily/Greasy, Outer Ring Width 0.281 in, Outside Diameter 3/4 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 525 lbf, Flange Diameter Not Applicable, Flange Thickness Not Applicable, Flange Type Non-Flanged