A method for producing a T-cork, wherein the latter comprises: a disc-shaped component, and a stopper, which is produced by a primary moulding process, wherein the disc-shaped component comprises a bore with an undercut, in the region whereof the connection between the latter and the stopper is formed, wherein the T-cork can be produced by a number of successive, temporarily overlapping or simultaneous work steps, in such a way that: - in a first work cycle, a disc-shaped component is produced in a device from a starting material and its outer contour is processed on all sides, - a cylindrical bore of infinite depth is simultaneously introduced into an end face of the disc-shaped component - and the disc-shaped component is ejected, - subsequently in a second work cycle, machining takes place in a device roughly in the region of the bore base of the disc-shaped component, by means of which a partial, non-circumferential undercut is formed, wherein the latter is formed asymmetrical to the bore, - in a third work cycle, the disc-shaped component is fed to a moulding tool, is positioned in the latter in such a way that it is positioned with its outer side in a die, a connection to the remaining cavity of the moulding tool exists at least with the bore and subsequently a foamable plastic material is injected, foamed and the remaining mould cavity and the concentric bore with the undercut is thus completely filled, in such a way that a stopper, comprising a foamed plastic, is integrally moulded to the disc-shaped component. a disc-shaped component, and a stopper, which is produced by a primary moulding process, wherein the disc-shaped component comprises a bore with an undercut, in the region whereof the connection between the latter and the stopper is formed, wherein the T-cork can be produced by a number of successive, temporarily overlapping or simultaneous work steps, in such a way that: - in a first work cycle, a disc-shaped component is produced in a device from a starting material and its outer contour is processed on all sides, - a cylindrical bore of infinite depth is simultaneously introduced into an end face of the disc-shaped component - and the disc-shaped component is ejected, - subsequently in a second work cycle, machining takes place in a device roughly in the region of the bore base of the disc-shaped component, by means of which a partial, non-circumferential undercut is formed, wherein the latter is formed asymmetrical to the bore, - in a third work cycle, the disc-shaped component is fed to a moulding tool, is positioned in the latter in such a way that it is positioned with its outer side in a die, a connection to the remaining cavity of the moulding tool exists at least with the bore and subsequently a foamable plastic material is injected, foamed and the remaining mould cavity and the concentric bore with the undercut is thus completely filled, in such a way that a stopper, comprising a foamed plastic, is integrally moulded to the disc-shaped component. - in a first work cycle, a disc-shaped component is produced in a device from a starting material and its outer contour is processed on all sides, - a cylindrical bore of infinite depth is simultaneously introduced into an end face of the disc-shaped component - and the disc-shaped component is ejected, - subsequently in a second work cycle, machining takes place in a device roughly in the region of the bore base of the disc-shaped component, by means of which a partial, non-circumferential undercut is formed, wherein the latter is formed asymmetrical to the bore, - in a third work cycle, the disc-shaped component is fed to a moulding tool, is positioned in the latter in such a way that it is positioned with its outer side in a die, a connection to the remaining cavity of the moulding tool exists at least with the bore and subsequently a foamable plastic material is injected, foamed and the remaining mould cavity and the concentric bore with the undercut is thus completely filled, in such a way that a stopper, comprising a foamed plastic, is integrally moulded to the disc-shaped component.