Short pitch driving roller chain: It is articulated by roller link and pin link.It is interference fit between pin and outer link, bush and inner link; while clearancefit between pin and bush. The roller can roll freely around the bush forreduction of friction and wear and mitigation of impingement, which is used fordriving. When it has standard or non-standard attachment, the short pitch rollerchain can also used for conveying in accordance with the function of attachment