... balls used for bearings 2.Hardness:HRC58-61 3.High precision,ABEC-1,P0 3/16 inch ,4.763mm ball bearing steel ... bearing steel ball1)material:AISI52100 GCr152)Size:1/8",1/4",3/16",5/16",5/32",3/8"3)Grade:G10-G10004)Hardness: HRC60-625) Producing ... hardness.7)Using:1. General industry for automobile, motorcycle, bicycle manufacturing, special bearings & micro – ball for the electronics industry.. 2. High ...