Abstract text

Element for fastening accessories to metal window and door frames, comprising: a monolithic metal body with a cylindrical central portion having a threaded inner hole, an insertion portion with cone frustum shape with decreasing diameter from the diameter of the cylindrical central portion towards one end, a stop portion comprising a circumferential throat delimited by a shoulder whose outer diameter is greater than the diameter of the cylindrical central portion, the outer diameter of the shoulder being joined to the cylindrical central section by means of a cone frustum shaped segment, a first series of through longitudinal grooves that extend on a part of the length of the cylindrical central portion and on the insertion portion and which define a first section able to be deformed radially inwards relative to a non-deformed resting configuration, and a second series of through longitudinal grooves that extend on a part of the length of the cylindrical central portion and on the stop portion and which form a second section able to be deformed elastically inwards relative to the non-deformed resting configuration.