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This Enerpac RCH-1003 single-acting hollow-plunger hydraulic cylinder with 100-ton capacity and 3.00" stroke has a one port, spring return of the single piston rod, and a hollow plunger for use in applications where the need for push and pull forces might alternate, such as testing, maintenance, and tensioning applications. The single-acting hydraulic cylinder uses liquid pumped through its single port for rod extension and an internal spring for rod retraction to produce continued movement. The port is a quick-connect CR-400 female coupler for use with a CH-604 male coupler (sold separately). Baked enamel body finish provides corrosion resistance. The center tube floats to extend the life of the seals. The threaded collar accepts accessories (sold separately). Specifications Cylinder capacity 100 tons (103.1 maximum) Stroke length 3.00 inches Effective area 20.63 square inches Oil capacity 61.88 cubic inches Cylinder bore diameter 6.50 inches Collapsed height 10.00 inches Extended height 13.00 inches Outside diameter 8.38 inches Center hole diameter 3.11 inches Port size 1/4" NPTF Weight 132 lb. Enerpac manufactures high-pressure tools and equipment for industrial applications. The company, founded in 1910, is headquartered in Menomonee Falls, WI.