Mechanical locking system for building panels

A set of panels comprising a first and a second panel, a panel edge of the second panel being insertable into a core groove of the first panel to obtain a mechanical connection between the first and the second panel, the panel edge being insertable into the core groove by an linear relative displacement of the first and second panel when the first and second panel are arranged perpendicularly to each other,

• said panel edge comprising a separate and flexible tongue and said core groove comprising a tongue groove,
• wherein the separate and flexible tongue is insertable into the tongue groove for connecting said panels to each other in a first direction, which is perpendicular to a main plane of the first panel,
• wherein the panel edge of the second panel is configured to cooperate with the core groove of the first panel for connecting said panels to each other in a second direction, which is perpendicular to a main plane of the second panel,
• wherein a longitudinal direction of the separate and flexible tongue extends parallel with said panel edge and/or core groove, and
• wherein the separate and flexible tongue is arranged in an insertion groove, said separate and flexible tongue being displaceable inwardly towards a bottom of the insertion groove and outwardly into the tongue groove during a locking of the first and second panel,
• wherein a corner of the core groove, where the core groove meets a surface of the first panel, is beveled and is configured to form an engagement portion of the core groove that engages with said separate and flexible tongue during locking of the first and second panel for displacing the separate and flexible tongue inwardly towards the bottom of the insertion groove,
• wherein the second panel comprises an overlapping portion, wherein at least a portion of the beveled corner and at least a portion of the overlapping portion of the second panel are parallel.