We needed 500 ton clamping force between two large plates. We modified eight 60 Ton hollow ram hydraulic cylinders to accomplish that. The modification involved machining a different saddle to allow the cylinder to be held to the stationary plate and also replacing the bottom plug with a one threaded for a 2 threaded rod. With all eight cylinders mounted around the circumference of the stationary plate the rods would go through the holes in the moving plate allowing to clamp a stack of hydrolysis cells between the plates and compressing them with a constant force for testing. The fixture was located in the laboratory environment and was not used much at all before the program ended. Those cylinders are great whenever a high force clamping is needed. The set includes the cylinder with modified saddle, the threaded rod 2″- 4.5 about 30″ long 3 matching nuts and washers.