Radial Ball Bearing, Bearing Industry Number 638, Bore Diameter 8 mm, Closure Double Sealed, For Environment Oily/Greasy, Outer Ring Width 9 mm, Outside Diameter 28 mm, Ring Material Alloy Steel, Seal Type Contact, System of Measurement Metric, Cage Material Steel, ABEC Rating 1, Ball Material Steel, Ball Material Grade AISI 52100, Bore Diameter Tolerance + 0.000 /- 0.008 mm, Cage Type Sealed, Dynamic Radial Load Capacity 1, 000 lbf, Flange Diameter Not Applicable, Flange Thickness Not Applicable. This item has been restricted from sale in the following state (s): []