1.Material:Gcr15 high carbon chrome bearing steel    (AISI E52100)

2.Grade: G10,G5   Size:2.0mm,2.381mm(3/32"),3.175mm(1/8"),3.5mm,3.969(5/32"),4.763mm(3/16"), 5.953mm(15/64"),6.35(1/4") Gauge: ±12  Subgauge:±0.4          
                    
3.the main steps to produce the ball: heading,polishing,heat treament,grinding,lapping,packing

4.the product is: possible hardness, technical characteristics,perfectly shiny, compact and defect-free surface,low noise

5.used for 6907zz,6906zz,6904zz,6201zz,6202zz bearing no. and etc.

6.HRC: 62-66   7.Noise: 26-30db