... -60m Bearing steel ball Production nameG28,G40,G100-G1000 high precision bearing steel balls size2MM-60MMGradeG28,G40,G80,G100,G200,G500 ... /ROHS report GradeAvailable Size RangeDiameter tolerance(μm)Deviation from Spherical Form(μm)Lot Diameter Variation(μm)Ra(μm)101/16”~1”0.250.250 ... ”~1”25.4025.4050.80- GradeAvailable Size RangeGauge Interval(μm)Preferred Gauge(μm)101/16”~1”1-10,…..,-1,0,+1,…..,+9281 ...