Hollow Industrial standard high quality single acting/spring return cylinders manufactured from durable high strength alloy steel with a Baked Enamel finish. The plunger is chrome plated to resist wear and rust. The saddles are hardened which prevents the piston from jamming in the top bearing and heavy-duty return springs enable fast piston retraction. Port connections on all cylinders are 3/8-18 NPT and are fitted with a female high flow coupler. Enerpac cylinders are designed to ANSI B30.1 and have a maximum operating pressure of 700 bar.