Standard Roller Chains or bush roller chain are chain drives. They are most commonly used for transmission. They are used in various mechanical power machines such as domestic, industrial & agricultural machinery. They are sometime used in conveyors, wire- and tube-drawing machines, large printing presses, cars, motorcycles, bicycles & many more. Standard roller chains are basically made up of a series of short cylindrical rollers that are held together by side links. Now these rollers are driven by a toothed like wheel structure that is known as a sprocket. Basically chains are used to transfer the power transmission from the engine to the gear or to the wheels. It is a very simple, reliable, and efficient method used in machines nowadays.