1018 Carbon Steel Ball Material Carbon Steel Material Grade 1018 Ball Bearing Grade 200 Ball Weight 0.445 g Outside Diameter 3/16 in Rockwell Hardness C60 to C67 Mechanical Finish Polished Machinability Not Rated Standards ABMA ANSI Outside Diameter Tolerance +/-0.001 in Brinell Hardness 640 Application Bearings Industrial Shape Ball System of Measurement Inch Package Quantity 250