... C1045, ground & polished hard chrome plated rod4.Tube Weldment High tensile cold drawn tube, precision honed for extended seal life5.Port Plug ... expanderB. Piston OD seal(A type piston) Polyurethane U-capC. Tube seal O-ring(1)+back up ring(1)D. Rod ... : ISO9001-2000, ISO9001-2008 Quality Assurance System, the USA UL.4. Products covering hydraulic cylinders, pistons, flanges, valves parts, casting and ...