Radial Ball Bearing Bearing Industry Number 61801 Bore Diameter 12 mm Closure Double Shielded For Environment Oily/Greasy Outer Ring Width 5 mm Outside Diameter 21 mm Ring Material Alloy Steel System of Measurement Metric Cage Material Steel ABEC Rating 1 Ball Material Alloy Steel Ball Material Grade AISI 52100 Bore Diameter Tolerance +0/-0.008 mm Dynamic Radial Load Capacity 430 lbf Includes Retaining Ring No Lubricant Material Polyrex EM