Joint for articular braces comprising: - a main body having a first and second end (A, B) opposite to each other with respect to an axis of symmetry of said main body; - a first movable rod hinged to said first end of the main body; - a second movable rod hinged to said second end of the main body, said rods (2, 3) being engaged with each other to define a relative movement of mutual pivoting towards or pivoting away of said first and said second movable rod (2, 3); - at least one limiting element insertable between said first movable rod and said second movable rod to limit the relative movement of mutual pivoting towards and/or pivoting away of said rods (2, 3); said limiting element defining a predefined limit pivoting away position and/or a predefined limit pivoting towards position between said first and said second movable rod (2, 3); - at least one engagement element housable in a wall of said main body and reversibly engageable in a respective seat of said limiting element so as to maintain said limiting element in position during the relative movement of mutual pivoting towards or pivoting away of said movable rods (2, 3), said engagement element comprising a movable body inside a respective housing obtained in the wall of the main body between a constraint position in which it at least partially extends inside the seat of the limiting element, and a release position in which it is retracted inside the housing to allow the insertion or extraction of the limiting element; said joint being characterized in that said movable body has a substantially spherical conformation and is made of magnetic material, said movable body in the respective constraint position being attracted by magnetic effect inside the seat of the limiting element. - a main body having a first and second end (A, B) opposite to each other with respect to an axis of symmetry of said main body; - a first movable rod hinged to said first end of the main body; - a second movable rod hinged to said second end of the main body, said rods (2, 3) being engaged with each other to define a relative movement of mutual pivoting towards or pivoting away of said first and said second movable rod (2, 3); - at least one limiting element insertable between said first movable rod and said second movable rod to limit the relative movement of mutual pivoting towards and/or pivoting away of said rods (2, 3); said limiting element defining a predefined limit pivoting away position and/or a predefined limit pivoting towards position between said first and said second movable rod (2, 3); - at least one engagement element housable in a wall of said main body and reversibly engageable in a respective seat of said limiting element so as to maintain said limiting element in position during the relative movement of mutual pivoting towards or pivoting away of said movable rods (2, 3), said engagement element comprising a movable body inside a respective housing obtained in the wall of the main body between a constraint position in which it at least partially extends inside the seat of the limiting element, and a release position in which it is retracted inside the housing to allow the insertion or extraction of the limiting element;