Pancake Lock Nut Cylinders  Extremely low height for use in confined areas  Safety lock nut for mechanical load holding  Overflow port functions as a stroke limiter  CR-400 coupler and dust cap included on all models  Single-acting,Website:http://www.dudemachinery.com, load return  Optional special synthetic coating for improved corrosion  resistance and lower friction for smoother operation to  with stand side load forces up to 3% of rated cylinder  capacity without scoring