F series gear reducer is one kind of parallel shaft helical gear reducer , which consist of 2 or 3 stages helical gears  (relate to gear ratio) in the same case . The hard tooth surface gear use the high quality alloy steel ,the process of carburizing and quenching, grinding ,which give it follow characters :Stable transmission ,low noise and temperature ,high loading ,long working lift . Wide application ,specialize in Metallurgy ,Sewage treatment,Chemical Industry , Pharmacy ,Agriculture equipment and Oil industry.