Connection socket and connector

A connection socket for use in a connector comprising:

• a casing which extends along a connection axis at least in some regions and which extends in the circumferential direction about the connection axis at least in some regions, wherein a receptacle is disposed in the interior of the casing,
• a base region which is connected to the casing or is part of the casing and which extends perpendicular to the connection axis at least in some regions, wherein the base region delimits the connection socket in the direction of the connection axis on one side,
• at least one securing element which is disposed on or in the casing or on or in the base region,
• at least one pressure surface which extends in the radial direction to the connection axis, wherein the pressure surface forms a front surface of the connection socket in the direction of the connection axis or projects beyond the front surface of the connection socket disposed on the base region in the radial direction to the connection axis,
• at least one undercut which forms a cavity in the interior of the casing, wherein the undercut is delimited by elements of the connection socket projecting in the radial direction to the connection axis and adjoining the undercut on two opposite sides in the direction of the connection axis, and the undercut is open in some regions in the radial direction to the connection axis.