Roller chain or bush roller chain is the kind of chain drive mostly used for transmission of mechanical power on many types of domestic, commercial and agricultural machinery, including conveyors, wire- and tube-drawing machines, printing presses, cars, motorcycles, and bicycles. It consists of a series of brief cylindrical rollers held jointly by side links. It is Conveyor Chain driven by a toothed wheel called a sprocket. It really is a straightforward, reliable, and efficient[1] means of power transmission.

Though Hans Renold is credited with inventing the roller chain in 1880, sketches by Leonardo da Vinci in the 16th century show a chain with a roller bearing.