1.AISI52100 Gcr15 chrome bearing steel ball,ISO standard

2.Grade: G10   
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      
                        
the main steps to produce the ball: heading,polishing,heat treament,grinding,lapping,packing

the special and and fine producing-technique;the tiptop production equipment,like:super-fine dringding machine from Germany,resin super-fine grinding machine from Japan; the precision test equipment,like:automatic stee-ball shape tester,Single&Double-view metalloscope,Rockwell & Vickers hardness tester,stee-ball vibration measurer,roundness meter and etc;and an appropriate scale of operation       
                    
the product is: possible hardness, technical characteristics,perfectly shiny, compact and defect-free surface,low noise

HRC: 62-66    Noise: 26-30db   VDWS: bellow 0.012um