Header connector comprising an interior undercut space

A method for producing a header connector, comprising the steps of:

• providing at least two interface portions, each interface portion comprising a bottom wall and side walls, the side walls protruding perpendicular away from the bottom wall, the side walls and the bottom wall defining a receptacle with an opening for receiving a counterpart connector, a mating direction of the header connector being parallel with the side walls and pointing away from the bottom wall towards the opening, a side wall portion of the side walls having an outer side wall surface and an opposing inner side wall surface, wherein a lock protrusion transversely protrudes away from an outer side wall perpendicular to the mating direction, wherein each interface portion comprises an interior undercut space at least partly defined by the bottom wall and an inner side wall surface, and wherein each interface portion comprises a seal protrusion that protrudes from the bottom wall into the interior undercut space;
• aligning at least two interface portions side by side at a same height level;
• molding a frame around at least a portion of the at least two interface portions by means of over molding such that the side wall portions protrude inwards into the frame, and cover by over molding the lock protrusion such that they protrude into the frame and occupy by over molding the interior undercut space.