... ,etc Recoil sping track coil spring for excavator and bulldozer Specifications Recoil spring Track coil spring for Komatsu, Caterpillar, Hitachi, ... machines, more than 160 sets in total; 2) Material: iron, carbon steel, stainless steel, brass, copper, alloy steel, ... E-coating, Silkscreen, Heat treatment, Black oxid; 4) Standard/ specification: OEM service,and customer's drawings highly aprreciated.; 5 ...