... , Shaft Nut, Cushion Collar, Collar, Bushing Main paramenter of oil tank: 1, Oil tank rated pressure P;2, Cylinder barrel inner diameted ... 45 16Mn 27Si Mn 20Mn2Standard: GB8713-88 High Quality Kobelco Excavator Hydraulic Cylinder, Piston Rod, Cylinder Head, Shaft Nut, Cushion Collar, Collar, Bushing