Tank cover, in particular an SCR closure

Tank cover for mounting on a filler neck of a container, comprising a grip cap, a threaded part and a locking mechanism which is provided between the grip cap and the threaded part, the locking mechanism being formed by latching noses and by elastically deformable latching lugs interacting therewith, the latching lugs being integrally formed on either of the threaded part or grip cap and the latching noses being integrally formed on either of the grip cap or the threaded part, respectively, characterized in that the latching lugs are formed on or in the vicinity of a thread turn of the threaded part, wherein the latching noses comprise an entraining surface extending in parallel with the central longitudinal axis of the grip cap and running obliquely to the circumferential and radial direction, and an entraining surface extending in parallel with the central longitudinal axis of the grip cap and running in the radial direction, and in that the latching lugs comprise corresponding noses which project in the radial direction and comprise an entraining surface extending in parallel with the central longitudinal axis of the threaded part and running obliquely to the circumferential and radial direction, and an entraining surface extending in parallel with the central longitudinal axis of the threaded part and running in the radial direction, the oblique entraining surfaces of the latching lugs and latching noses interacting when the tank cover is rotated in the closing direction, and the entraining surfaces of the latching lugs and latching noses running in the radial direction interacting when the tank cover is rotated counter to the closing direction.