Lock Nut Cylinders  Single-acting,Website:http://www.dudemachinery.com, load return  Safety Lock Nut for mechanical load holding  Special synthetic coating for improved corrosion  resistance and lower friction for smoother operation  Overflow port functions as a stroke limiter  Interchangeable, hardened grooved saddles are  standard  Plunger wiper reduces contamination, extending  cylinder life  Can bear unbalanced loads to 5% of capacities  All models have CR-400 couplers and dust cap.