• hochwertige Bimetall-Kupferbüschungen; gut geschmierte Ölrecyclinganlage; hochhärte- und zerspanungsbeständiges Floating Seal aus Kralllegierung und elastischer O-Ring aus Gummi; Enhancement of wear resistance of rail surace by medium frequency quenching The axle is made of hich quality 45# steel which is enchanced the wear resistance by tempering and high frequency surface heat treatment.