Abstract: A plug-in connector between an ignition coil and a spark plug is designed so that the longitudinal tolerances cause no undesired coupling of the plug-in connector to the spark plug. When the plug-in connector is brought together with the ignition coil to form a pre-assembly unit, a latch connection is formed between a first socket of the plug-in connector and a coil stud, which can absorb the joining forces of this pre-assembly unit on the spark plug without deformation. After full coupling with the spark plug, further setup movement of the pre-assembly unit, in which the remaining assembly clearances are compensated, result in the first socket being latched on the coil stud and the longitudinal tolerances being internally compensated by the first socket being slid onto a press-over section of the coil stud. The plug-in connector is intended in particular for use in ignition systems of automobiles.