... size:2mm-60m Bearing steel ball Production nameG28,G40,G100-G1000 high precision bearing steel balls size2MM-60MMGradeG28,G40 ... 4050.80- GradeAvailable Size RangeGauge Interval(μm)Preferred Gauge(μm)101/16”~1”1-10,…..,-1,0 ... case-hardened only(surface heat treatment),low carbon steel balls offer considerable saving in all those ... Any further Information,Plz contact us! High Quality Bearing Steel Balls