Abstract: The invention discloses an installation for the automatic assembly of the lower socket-bracket of opening leaves, i.e. the part of the fitting intended to be fixed to the lower corner of an opening leaf preferably of oscillating leaf type, in line with its vertical axis of rotation and transferring the weight of the leaf to a bearing embedded in the frame.The automatic installation is essentially formed of an installation 100 for equipping the socket, formed of workstations disposed about a rotary bed-plate and an installation 200 for the automatic assembly of the bracket on the socket formed of work stations disposed in a reference plane P--P. These two installations 100 and 200 are associated together via an automatic transfer mechanism 30.The invention makes possible the equipping and assembling of socket-brackets, completely automatically, all the operations following each other in a continuous flow.