... , High Quality and Competitive Price 3, Professional Service Kobelco Excavator Hydraulic Cylinder, Piston Rod, Cylinder Head, Shaft Nut, Cushion Collar, Collar, Bushing Main paramenter of ... 45 16Mn 27Si Mn 20Mn2Standard: GB8713-88 High Quality Kobelco Excavator Hydraulic Cylinder, Piston Rod, Cylinder Head, Shaft Nut, Cushion Collar, Collar, Bushing