Stainless Steel Ball 316 Stainless Steel 316 Round Ball Bearing Grade 100 Outside Diameter 1/4 in Outside Diameter Tolerance +/-0.0005 in Fabrication Cold Finished Heat Treatment No Heat Treatment Heat Treatable No Mechanical Finish Polished Not Applicable Brinell Hardness C25 to C39 Rockwell Hardness Includes Material Certificate Yes Standards ANSI/ABMA Minimum Temperature -300 Degrees F Maximum Temperature 1 200 Degrees F Appearance Mirror-Like