... , Professional Service Kobelco Excavator Hydraulic Cylinder, Piston Rod, Cylinder Head, Shaft Nut, Cushion Collar, Collar, Bushing Main paramenter of ... , Connection of oil inletSpecification: diameter of cylinder 30-60mm wall thickness 3-50mmMaterials: 20 45 16Mn 27Si Mn 20Mn2Standard: ... Quality Kobelco Excavator Hydraulic Cylinder, Piston Rod, Cylinder Head, Shaft Nut, Cushion Collar, Collar, Bushing