... cr+40 chromed plated Various parts for hyundai R210 arm, boom, bucket cylinder assy: Part name: R210 ... arm boom bucket cylinder assyMaterial: 45# steel,40CrApplied excavator: ... of hydraulic cylinders for excavator including Boom cylinder, Arm cylinder and Bucket cylinder, which are applicable for Catepillar, Komatsu. ... ,EC450,EC460 R210 arm, boom, bucket cylinder assy for hyundai