Abstract: Bush-like and plug-like contact elements and plug-in connectors which contain such contact elements. The contact elements have, on one front box section which is provided for insertion into a chamber of a plug-in connector body, a first latching element which can make a latching connection with a complementary second latching element of the plug-in connector body, in order to hold the contact element non-displaceably in the body. The first latching element is arranged on a flexible tongue of the box section, which tongue can move perpendicularly with respect to the plugging-in direction in order to release the latching connection.