... 34) Processing: precision hot and cold forging, precision machining and roll forming5) Heat treatment: annealing, normalizing, ... gravity casting , sand castingMachiningTurning , milling , drilling , grinding , threading , CNC machining, etc.FinishingSand blasting , polishing , plating , acid treatment , anodizing , painting ... testing, impact testing.CertificateISO9001:2000 / TS16949 High quality gear