Roller chain or bush roller chain is the type of chain drive mostly used for tranny of mechanical power on many types of domestic, commercial and agricultural Conveyor Chain machinery, including conveyors, wire- and tube-drawing devices, printing presses, vehicles, motorcycles, and bicycles. It contains a series of brief cylindrical rollers held collectively by part links. It is driven by a toothed wheel known as a sprocket. It is a simple, reliable, and efficient[1] method 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.