Four M Technologies [P] Limited manufactures Single Acting, Spring-Return Threaded Body Cylinders. Four M Technologies [P] Limited also manufactures various types of hydraulic cylinders and hydraulic modular fixturing systems. The Single Acting, Spring-Return Threaded Body Cylinders are ideal for external plumbing mounting. The Single Acting, Spring-Return Threaded Body Cylinders are available in metric coarse or fine threads. The Single Acting, Spring-Return Threaded Body Cylinders have mounting brackets and lock nuts. These Threaded Body Cylinders has crowned threaded inserts thereby preventing damage to the work piece and the cylinder.