A scaffolding coupler intended for fixed attachment to the ends of a ledger of a scaffolding system, wherein the scaffolding system comprises standards and ledgers, wherein each standard comprises: • an elongate pipe wall with a central longitudinal axis (Ls); and • a number of supporting projections extending substantially in tangential direction of the pipe wall which are formed through plastic deformation of the pipe wall, each supporting projection, viewed in a tangential direction of the pipe wall, when the standard is vertically oriented, comprising a number of alternately arranged raised parts and lowered parts; wherein the scaffolding coupler comprises: • a foot which has a first side which is configured for the fixed connection with a ledger pipe end of a first ledger, a second side of the foot, which lies opposite the first side, forming a pipe support surface for abutment against the pipe wall of a standard or ledger; • a hook which is integrally connected with the foot, the hook having a radial inside contour which is substantially circular segmental; • at least one supporting surface which is formed by the foot and the hook and which in the connected condition of the scaffolding coupler with a standard rests on said supporting projection of the respective standard, the supporting surface being provided with at least one recess which is configured for receiving a raised part of this supporting projection for tangential orientation of the scaffolding coupler relative to the standard; • a pin which is slideably connected with the hook; characterized in that the pin is a bent pin, which is provided with a substantially circular segmental inside contour located on a radial inside of the bent pin, and which, in use, abuts directly against a pipe wall of a standard to be coupled to the first ledger or a ledger, wherein the bent pin has a substantially circular segmental outside contour which is located on a radial outside of the bent pin and which abuts against the substantially circular segmental inside contour of the hook, while the inside contour of the bent pin together with the pipe support surface define a pipe receiving space having a central longitudinal axis (Lc) which in coupled condition with a standard or ledger substantially coincides with a central longitudinal axis (Ls) of such standard or ledger, the inside contour and the outside contour of the pin being oriented relative to each other such that a radial thickness of the bent pin viewed from a first free end towards a second free end of the pin gradually increases, the bent pin being received in the hook in a manner slideable in tangential direction. • an elongate pipe wall with a central longitudinal axis (Ls); and • a number of supporting projections extending substantially in tangential direction of the pipe wall which are formed through plastic deformation of the pipe wall, each supporting projection, viewed in a tangential direction of the pipe wall, when the standard is vertically oriented, comprising a number of alternately arranged raised parts and lowered parts; • a foot which has a first side which is configured for the fixed connection with a ledger pipe end of a first ledger, a second side of the foot, which lies opposite the first side, forming a pipe support surface for abutment against the pipe wall of a standard or ledger; • a hook which is integrally connected with the foot, the hook having a radial inside contour which is substantially circular segmental; • at least one supporting surface which is formed by the foot and the hook and which in the connected condition of the scaffolding coupler with a standard rests on said supporting projection of the respective standard, the supporting surface being provided with at least one recess which is configured for receiving a raised part of this supporting projection for tangential orientation of the scaffolding coupler relative to the standard; • a pin which is slideably connected with the hook;