... ball Production nameG28,G40,G100-G1000 high precision bearing steel balls size2MM-60MMGradeG28,G40,G80,G100,G200,G500,G1000,G2000HRC58-62hrcQuality ... certificateISO 9001:2008/SGS test report/ROHS report GradeAvailable Size RangeDiameter tolerance(μm)Deviation from Spherical Form(μm)Lot Diameter ... 4.00-16,…..,-4,0,+4,…..,+16601/16”~1”5.00-25,…..,-5,0,+5,…..,+251001/16”~1”10.00-40,…..,-10,0 ...