A quick-assembly nut forming assembly for a formwork rod including a nut body having interior tapping suitable for cooperating with a thread of a formwork rod and a nut head which extends at one end of the body with a greater diameter than the nut body and which is suitable for bearing against a formwork element and thus ensuring the blocking by bearing of the formwork element, wherein the nut body and the nut head each comprise three disjoint parts (10a, 10b and 10c) each forming an angular portion of the nut body and of the nut head and an assembly element which protrudes from the nut body angular portion at the nut head, the assembly also including a retractable ring having an opening, the retractable ring being mounted on the nut body and suitable for being moved on it between at least two positions: - a first position wherein the opening retains the parts of the nut body (10a, 10b and 10c) close to one another by clamping, the different angular portions of the nut body (39a, 39b, 39c) having interior walls defining together a tapping of the nut, - a second position wherein the angular portions of the nut body (10a, 10b and 10c) are separated from one another, thus allowing the nut body to slide in translation on the threaded rod, wherein the assembly elements at one end of a nut body (10a, 10b and 10c) angular portion include, on the one hand, a contact plate (13a, 13b, 13c) which extends transversely in a first direction starting from said angular portion and at a first height of it, and on the other hand an interlocking leg (14a, 14b, 14c) which extends transversely in a second direction at a height that is set back from that of the contact plate (13a, 13b, 13c), the interlocking leg (14a, 14b, 14c) associated with an angular portion of the nut body (10a, 10b, 10c) being capped by the contact plate (13a, 13b, 13c) of another part when the different angular portions are assembled to form the nut-forming assembly. wherein the nut body and the nut head each comprise three disjoint parts (10a, 10b and 10c) each forming an angular portion of the nut body and of the nut head and an assembly element which protrudes from the nut body angular portion at the nut head, the assembly also including a retractable ring having an opening, the retractable ring being mounted on the nut body and suitable for being moved on it between at least two positions: - a first position wherein the opening retains the parts of the nut body (10a, 10b and 10c) close to one another by clamping, the different angular portions of the nut body (39a, 39b, 39c) having interior walls defining together a tapping of the nut, - a second position wherein the angular portions of the nut body (10a, 10b and 10c) are separated from one another, thus allowing the nut body to slide in translation on the threaded rod, - a first position wherein the opening retains the parts of the nut body (10a, 10b and 10c) close to one another by clamping, the different angular portions of the nut body (39a, 39b, 39c) having interior walls defining together a tapping of the nut, - a second position wherein the angular portions of the nut body (10a, 10b and 10c) are separated from one another, thus allowing the nut body to slide in translation on the threaded rod, wherein the assembly elements at one end of a nut body (10a, 10b and 10c) angular portion include, on the one hand, a contact plate (13a, 13b, 13c) which extends transversely in a first direction starting from said angular portion and at a first height of it, and on the other hand an interlocking leg (14a, 14b, 14c) which extends transversely in a second direction at a height that is set back from that of the contact plate (13a, 13b, 13c), the interlocking leg (14a, 14b, 14c) associated with an angular portion of the nut body (10a, 10b, 10c) being capped by the contact plate (13a, 13b, 13c) of another part when the different angular portions are assembled to form the nut-forming assembly.