... Normal modal is between 1.5~34) Processing: precision hot and cold forging, precision machining and roll forming5) Heat treatment: annealing, ... normalizing, carbonitriding,carburizing, tempering6) Precision shot peen gear faces and roots to increase load capacity ... hardness testing, tensile testing, impact testing.CertificateISO9001:2000 / TS16949 High quality gear