"Universal end mountings. A favorite for contractors, industrial, and agricultural applications. All steel welded construction weld-on cross tube. Heavy wall steel tubing, ground and polished chrome piston rod with pin eye, cast iron piston. O-rings and back up washers, trac-type gland retainer. Maximum working PSI is 2500, bursting PSI is 5000. 2 1/2in. bore cylinders have 3/4in. pin holes. The 3in. and 3 1/2in. bore cylinders have 1in. pin holes. The 4in. bore cylinders have 1 1/4in. pin holes. 2 1/2in. bore cylinders have 3/8in. working ports. The rest have 1/2in. working ports. Double acting. U.S.A. Bore Diameter in. 4, Closed Pin Center in. 39, Stroke Length in. 30, Max. PSI 2,500, Shaft Diameter in. 2."