RATCHET TIGHTENER

The invention relates to a tensioning device for tensioning chains, straps, cables or similar tensioning means (), having at least one tubular tensioning nut () and at least one threaded bolt () passing into the tensioning nut () and interacting therewith, wherein the threaded bolt () is equipped with at least one unscrewing prevention means (a, ) at the end, and wherein the threaded bolt () is equipped at the end with a thread-free region () and a stop () adjoining thereto as the unscrewing prevention means (a, ).