A chain screw, also known as a chain tensioner screw or chain adjuster screw, is a component used in mechanical systems that employ chains. It is typically found in applications such as bicycles, motorcycles, or industrial machinery that utilize chains for power transmission or tensioning. The chain screw is designed to adjust the tension or slack in the chain. It usually consists of a threaded rod or screw-like mechanism that is integrated into the chain tensioner system. By turning the chain screw, the position of the tensioner or guide can be adjusted, thereby altering the tension of the chain. In a bicycle, for example, the chain screw is part of the rear derailleur mechanism. By turning the chain screw, the derailleur moves back and forth, allowing for precise positioning of the chain on different gears and maintaining proper tension. Similarly, in other applications, the chain screw serves to ensure that the chain is properly tensioned and aligned for efficient and reliable operation. The specific design and features of a chain screw may vary depending on the particular application and the complexity of the chain tensioning system.
