While solving technological tasks of production, it is impossible to do without chains with attachments or with increased contact surfaces. The design of such chain contains hollow or elongated pins, curved links, attachments of different types and openings in links. In case of transportation of small and lightweight products for short distances, single-pitch chains with attachments are used. These chains are characterized by smooth run and low noise. In most cases, they are compatible with standard sprockets for roller chains. In case of long conveyors, double-pitch chains with attachments are used, to decrease number of chain elements and reduce expenditures.