1018 Carbon Steel Ball Material Carbon Steel Material Grade 1018 Ball Bearing Grade 1 000 Ball Weight 1.497 g Outside Diameter 9/32 in Rockwell Hardness C60 to C67 Mechanical Finish Polished Machinability Not Rated Standards ABMA ANSI Outside Diameter Tolerance +/-0.005 in Brinell Hardness 640 Application Bearings Industrial Shape Ball System of Measurement Inch Package Quantity 250