Heavy-duty cylinders have cast-iron end caps for hydraulic or air pressure to 450 psi. These cylinders incorporate recessed gasketed tube seals and piston o-ring as standard features. Each assembly is prelubricated and 100% pressure tested. More than five mounting styles in 11 standard bores from 2½ to 6 in. with standard rod diameters from ¾ to 1¼ in.