Overlapping arrangement of at least two gangplanks (22, 23) for a scaffolding, a work platform, a cantilever, a stage or the like, comprising at least one first gangplank of metal and second gangplank of metal, each gangplank (22, 23) having a walk surface (24, 25) of sheet metal provided with substantially round passage holes (27, 31), wherein at least a part of the passage holes (27, 31) of each gangplank (22, 23) is respectively bounded by an encircling hole edge (28, 32) which spans an inner diameter and is bulged out to a hole edge height above or below a surface of the metal sheet, wherein the second gangplank is arranged above the first gangplank and overlaps the first gangplank in such a way that the walk surface of the upper, second gangplank at least partly engages over the walk surface of the lower, first gangplank, wherein the first gangplank and the second gangplank are fastened to one another by means of a fastening bolt to be secure against displacement relative to one another in a displacement plane extending parallel to the walk surfaces (24, 25) thereof and against lifting off one another, but to be detachable again, wherein the fastening bolt comprises a fastening head having a head height and a bolt shank projecting not only through a passage hole, which is bounded by a bulged-out encircling hole edge spanning an inner diameter, of the passage holes of the upper, second gangplank, but also through a passage hole, which is bounded by a bulged-out encircling hole edge spanning an inner diameter, of the passage holes of the lower, first gangplank, and wherein the fastening head engages over a hole edge of that passage hole of the passage holes of the upper, second gangplank through which the bolt shank of the fastening bolt projects and bears against this hole edge, characterised in that the fastening bolt is a securing screw of metal having a thread, that the fastening head is a screw head, which has the head height, of the securing screw, that the bulged-out hole edges (28, 32) are each bounded in encircling manner and as considered in a cross-section containing a passage hole axis (52, 53) by an inner radius (54, 55), that the hole edge height of the hole edges (28, 23) is 3.5 to 4 millimetres, that the head height of the screw head approximately corresponds with the hole edge height or is the same size as or smaller than the hole edge height, that the thread has a thread pitch which approximately corresponds with the inner radius (54, 55) or is the same size as or slightly smaller or slightly larger than the inner radius (54, 55), that the thread has a thread base, which spans a core diameter and which as considered in the direction of the screw longitudinal axis of the securing screw has a width of approximately 1.5 to 2.5 millimetres or approximately 2 millimetres between adjacent thread flanks, that the securing screw is directly screwed by its thread at least into the said passage hole of the lower, first gangplank without plastic deformation and without elastic enlargement of the hole edge of this passage hole, that the geometry of the thread of the securing screw is formed to be matched to the geometry of the bulged-out hole edges (28, 32) in such a way that during screwing of the securing screw into the passage hole of the lower, first gangplank neither a plastic deformation nor an elastic enlargement of the hole edge of this passage hole occurs, and that the second gangplank and the first gangplank are frictionally and mechanically positively clamped together free of play to be secure against lifting off one another and against lateral displacement relative to one another only with the aid of the securing screw bearing by the screw head thereof against the hole edge of the said passage hole of the upper, second gangplank, thus free of further auxiliary fastening means and without the assistance of a nut screwed onto the securing screw.