A fastening device (1) for fixing two shuttering parts comprises an armature closure (2) with two separate shell sections (2a, 2b), wherein the inner surfaces of the shell sections (2a, 2b) together form a contour and within an elongated and hollow, on both end sides open body (3) are arranged. At least one of the jacket sections (2a, 2b) is displaceable in the radial direction with respect to the longitudinal axis (x), such that the anchor closure (2) can be pushed over at least a first position of the displaceable jacket section (2b) via an anchor rod for holding the shuttering parts and in a second position of the displaceable jacket section (2b), the anchor fastener (2) on the anchor rod by means of a positive connection of the contour of the inner surfaces of the jacket sections (2a, 2b) with a corresponding mating contour in the direction of a longitudinal axis (x) of the fastening device (1) Outer surface of the anchor rod is fastened.
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