Roller chain or bush roller chain is the type of chain drive most commonly used for transmission of mechanical power on many types of domestic, industrial and agricultural machinery, including conveyors, wire- and tube-drawing devices, printing presses, cars, motorcycles, and bicycles. It includes a series of brief cylindrical rollers held collectively by aspect links. It is driven by a toothed wheel called a sprocket. It really is a straightforward, reliable, and agricultural Chain 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.