Plug-in connector system comprising a first plug-in connector and a second plug-in connector , wherein the first plug-in connector has an assembly housing portion and a shielding spring contact connected to the assembly housing portion , and the second plug-in connector has a shielding housing connected to the shielding spring contact , wherein the assembly housing portion has a bottom side and a first passage opening , wherein the shielding spring contact has a flat base portion and a shielding portion , wherein the base portion has a top side and a cutout , wherein the shielding portion of the shielding spring contact has a wall connected to the base portion and encircling the cutout , wherein the wall has an outer side , an inner side , an upper side and a lower side , wherein the wall is arranged, by way of its lower side , on the top side of the base portion in such a way that the lower side of the wall laterally surrounds the cutout in the base portion , wherein the shielding housing of the second plug-in connector has a shielding housing wall with a second passage opening facing the assembly housing portion , wherein the shielding spring contact bears, by way of the top side of the base portion , against the bottom side of the assembly housing portion , wherein the shielding portion of the shielding spring contact projects through the first passage opening in the assembly housing portion , characterized in that the shielding portion projects through the second passage opening in the shielding housing wall into the shielding housing and bears against the shielding housing wall in the region of the second passage opening . wherein the first plug-in connector has an assembly housing portion and a shielding spring contact connected to the assembly housing portion , and the second plug-in connector has a shielding housing connected to the shielding spring contact , wherein the assembly housing portion has a bottom side and a first passage opening , wherein the shielding spring contact has a flat base portion and a shielding portion , wherein the base portion has a top side and a cutout , wherein the shielding portion of the shielding spring contact has a wall connected to the base portion and encircling the cutout , wherein the wall has an outer side , an inner side , an upper side and a lower side , wherein the wall is arranged, by way of its lower side , on the top side of the base portion in such a way that the lower side of the wall laterally surrounds the cutout in the base portion , wherein the shielding housing of the second plug-in connector has a shielding housing wall with a second passage opening facing the assembly housing portion , wherein the shielding spring contact bears, by way of the top side of the base portion , against the bottom side of the assembly housing portion , wherein the shielding portion of the shielding spring contact projects through the first passage opening in the assembly housing portion , characterized in that the shielding portion projects through the second passage opening in the shielding housing wall into the shielding housing and bears against the shielding housing wall in the region of the second passage opening . <EOS>