oil cylinder 1) doubling rods 2) inner/external thread 3) bore 20mm~100mm 4) carbon steel material HRPC brand double rods hydraulic oil cylinder 1) type:doubling acting2) inner/external thread3) bore 20mm~100mm4) packing material NBR/FPM HRPC company is a china manufacturer of hydraulic components, our products include:hydraulic ball valves, high pressure ball valves, threaded ball valve, flanged ...