Miniature Ball Bearing Bearing Industry Number 627 Bore Diameter 7 mm Closure Double Shielded For Environment Oily/Greasy Outer Ring Width 7 mm Outside Diameter 22 mm Ring Material Alloy Steel System of Measurement Metric ABEC Rating 1 Ball Material Alloy Steel Ball Material Grade AISI 52100 Bore Diameter Tolerance +0/-0.008 mm Cage Type Shielded Dynamic Radial Load Capacity 740 lbf Includes Retaining Ring No Lubricant Material Polyrex EM