Snap hooks, particularly snap hooks with a screw lock for mountaineering and climbing are provided. Such snap hooks may include a ring which has a straight side, interrupted by an opening defined by first and second ends, in which the opening is closed by a spring closing element which has an open position and a closed position, the snap hook having a separation lever dividing the space enclosed by the ring in two separate areas wherein the lever is independent from the closing element, and wherein the closing element and the separating lever are hinged to the same hinge.