Abstract: To permit the connection of an electric cable (12) in an end element (10) having a partly frustum-shaped outer surface, a crimping tool is proposed incorporating a gripping plier (50) and a crimping die (60). When the element (10) to be crimped has Been placed in a recess (48), an actuation of the tool has the effect of the element (10) being gripped by the plier (50), the closure of the die (60) and then the application of a tension to the end element by said plier (50), so as to make the die pass through said element. The die (60) then opens automatically and remains open until the tool has returned to the inoperative position.