Cushioned coupling hinge for hinging a seat or a cover to a bowl of a toilet, suitable to couple rotatably a movable component and a fixed component, wherein the movable component is the seat or the cover and the fixed component is the bowl of a toilet, said cushioned coupling hinge comprising: - a first element and a second element, wherein the first element may be joined integrally to the movable component to be cushioned so as to rotate therewith around an axis of rotation, and the second element may be joined to the fixed component; wherein: - the first element comprises a body equipped with a chamber adapted to house, at least partially, the second element, said chamber having an inner circular wall; - the second element comprises a body, adapted to be inserted, at least partially, into the chamber, and equipped with a fin protruding outwards; and further comprising an elastic element, interposed between the first element and the second element housed in the chamber and adapted to slow down the rotation of the first element acting during the closure of the movable component and without interfering with the opening of the movable component, characterized in that the inner circular wall is devoid of protruding elements in the direction of the axis of rotation, and in that when rotating the seat or the cover in a closing direction, the elastic element is pulled by the first element by friction against the inner circular wall to press against the fin of the second element so as to expand against the inner circular wall of the chamber slowing down the rotation of the first element without being over-compressed, a portion of the inner circumference always remaining free. wherein the movable component is the seat or the cover and the fixed component is the bowl of a toilet, said cushioned coupling hinge comprising: - a first element and a second element, wherein the first element may be joined integrally to the movable component to be cushioned so as to rotate therewith around an axis of rotation, and the second element may be joined to the fixed component; wherein: - the first element comprises a body equipped with a chamber adapted to house, at least partially, the second element, said chamber having an inner circular wall; - the second element comprises a body, adapted to be inserted, at least partially, into the chamber, and equipped with a fin protruding outwards; and - a first element and a second element, wherein the first element may be joined integrally to the movable component to be cushioned so as to rotate therewith around an axis of rotation, and the second element may be joined to the fixed component; wherein: - the first element comprises a body equipped with a chamber adapted to house, at least partially, the second element, said chamber having an inner circular wall; - the second element comprises a body, adapted to be inserted, at least partially, into the chamber, and equipped with a fin protruding outwards; and - the first element comprises a body equipped with a chamber adapted to house, at least partially, the second element, said chamber having an inner circular wall; - the second element comprises a body, adapted to be inserted, at least partially, into the chamber, and equipped with a fin protruding outwards; and further comprising an elastic element, interposed between the first element and the second element housed in the chamber and adapted to slow down the rotation of the first element acting during the closure of the movable component and without interfering with the opening of the movable component, characterized in that the inner circular wall is devoid of protruding elements in the direction of the axis of rotation, and in that when rotating the seat or the cover in a closing direction, the elastic element is pulled by the first element by friction against the inner circular wall to press against the fin of the second element so as to expand against the inner circular wall of the chamber slowing down the rotation of the first element without being over-compressed, a portion of the inner circumference always remaining free.