... treatment: annealing, normalizing, carbonitriding,carburizing, tempering6) Precision shot peen gear faces and roots to increase load capacity ... , milling , drilling , grinding , threading , CNC machining, etc.FinishingSand blasting , polishing , plating , acid treatment , anodizing , painting and PVC powder ... tensile testing, impact testing.CertificateISO9001:2000 / TS16949 High quality gear