Abstract: A cam cleat designed to secure sheets, halyards, lines etc. introduced into it on boats. The cam cleat includes two parts moving respectively, towards and away from each other, the faces of these parts which face each other being serrated, and these parts being so designed that they adopt a fixed position and a free position and are so pivoted that when they rotate in the same direction they either move towards each other or away from each other. These parts are spring-loaded in such a way that the first of the parts strives to adopt the free position and the other of these parts strives to adopt the fixed position. Further, the first of these parts can be locked in the fixed position by an eccentric control device. The first part is pivoted about a point in such a way that when rotated from the fixed position to the free position its serrations tend to detension a line in the cam cleat.