... stainless valve balls 2.Hardness:HRC58-62 3.Grade:G100 4.1/2",3/4" 1,1/4' 1,1/2' 1/2",3/4" 1, ... 1/4' 1,1/2' ... , AISI 1008, AISI 1010, AISI 10152)Size:0.5mm-50.8mm3)Grade:G100-G20004)Hardness: Hrc58--625)Producing ... , special bearings & micro – ball for the electronics industry. 2. High accuracy & low noise motor bearing& household appliance bearings ...