... ball Production nameG28,G40,G100-G1000 high precision bearing steel balls size2MM-60MMGradeG28,G40,G80,G100,G200,G500,G1000,G2000HRC58-62hrcQuality ... test report/ROHS report GradeAvailable Size RangeDiameter tolerance(μm)Deviation from Spherical Form(μm)Lot Diameter Variation(μm)Ra(μm) ... /16”~1”--10001/16”~1”--Applications :1,C10-C15 balls are case-hardened only(surface heat treatment),low carbon steel ...