For K1, K2,K3,K4,K5,K6,8A Y25 bogies Manufacturing standard:EN,TB/T ,UIC etc. Infinite life:300 million cycles fatigue test Technical parameters wire diameters(d)coil diameters(D)Free height(L0)weight(Kg)number of active coil(t)12-45mm60-245mm205-423mm4-823-121.Elements: internal spring and external spring2.Materials: 60Si2Mn, 60Si2MnA, 60Si2CrVA, and 60Si2CrVAT3.Usage:bogie of K2,K4,K8,Y25 with ...