... /316 (2) Grade G40-G1000 (3)Size: 3/32''~ 2'' (4)Chemical Composition steel ball ItemC%Cr%Si %Mn %P %S ... PROPERTYPARAMETERHardnessToleranceSurface 15-20≤0.05mmPolished (5) Application of carbon steel balls: bearing, caster, bicycle parts,pulleys,slide,screw, precision machine, ball ...