... ,45# carbon steel 2.ISO9001:2008,SGS 3.Hyundai,Hitachi,Volvo,etc 1.Excavator Parts Hydraulic Cylinder Application:We are specelized ... ,Nuts) for Komatsu,Hitachi,Kato,Caterpillar,Daewoo,Hyundai,Kobelco,Sumitomo,Volvo,Mitsubishi and etc excavators. 2.Feature:ApplicationExcavator Hydraulic CylinderMaterial45# Steel ... ,boom cylinder,bucket cylinder(Komatsu,Kobelco,Hitachi,Hyundai,Doosan,Cat,Volvo)