A clamping element for use in a product for forming a floor or wall composed of boards from a plurality of boards or in an assembled floor or wall constructed from said product, wherein the clamping element comprises: a substantially rectangular plate-like part with a plate width and a plate length and provided with a central opening for receiving a screw provided with a screw head, wherein the plate-like part on a surface thereof is provided with a bar-like edge element which is perpendicular to the plate-like part and has a constant width up to an end face thereof which is smaller than the plate width, and extends on the surface over substantially the length of the plate-like part, wherein the clamping element, on each of the head sides in the plate longitudinal direction, is provided with a bar-like protrusion perpendicular to the plate-like part towards a first side of the plate-like part, wherein each protrusion lies in the middle of one of the respective head sides, wherein the edge element extends between the protrusions on the first side; the edge element having a height which is less than a length of the protrusions, so that the protrusions extend past a free end of the edge element, characterised in that: - the central opening extends through the edge element, - the width of the edge element is at least equal to the dimension of the central opening in the width direction, - each protrusion has a width which is smaller than the plate width, and that - the width of the edge element is substantially equal to the width of the protrusion. a substantially rectangular plate-like part with a plate width and a plate length and provided with a central opening for receiving a screw provided with a screw head, wherein the plate-like part on a surface thereof is provided with a bar-like edge element which is perpendicular to the plate-like part and has a constant width up to an end face thereof which is smaller than the plate width, and extends on the surface over substantially the length of the plate-like part, wherein the clamping element, on each of the head sides in the plate longitudinal direction, is provided with a bar-like protrusion perpendicular to the plate-like part towards a first side of the plate-like part, wherein each protrusion lies in the middle of one of the respective head sides, wherein the edge element extends between the protrusions on the first side; the edge element having a height which is less than a length of the protrusions, so that the protrusions extend past a free end of the edge element, characterised in that: - the central opening extends through the edge element, - the width of the edge element is at least equal to the dimension of the central opening in the width direction, - each protrusion has a width which is smaller than the plate width, and that - the width of the edge element is substantially equal to the width of the protrusion. - the central opening extends through the edge element, - the width of the edge element is at least equal to the dimension of the central opening in the width direction, - each protrusion has a width which is smaller than the plate width, and that - the width of the edge element is substantially equal to the width of the protrusion.