Abstract: A threaded pin comprises a threaded cylindrical stem that extends between a proximal stem end and a distal stem end, and a coupling end portion that extends from the distal stem end. In the coupling end portion, at least one annular groove is formed, which is distally delimited by a distal annular ridge that defines a maximum outer diameter of the coupling end portion. The maximum outer diameter of the coupling end portion is smaller than the inner diameter of the threaded cylindrical stem in such a way that the coupling end portion may be inserted with play into a threaded hole wherein the threaded pin may be screwed, the distal annular ridge being suitable for insertion between the ridges of the female thread of the threaded hole.

Abstract: A self-locking pin comprising a pin body, a movable body slidably housed in the pin body in a form-fitting manner, the movable body being subjected to an axial force exerted by a first elastic element and having an end portion protruding from the pin body. The movable body has a radial detent seat wherein a locking detent is slidably housed, pushed radially outwards through a radial hole made in the pin body by a second elastic element housed in the detent seat. The radial locking detent has a distal detent portion which engages with play the radial hole and a proximal detent portion, which is larger in diameter than the distal detent portion, which engages with play the detent seat.

Abstract: A threaded pin comprises a threaded cylindrical stem that extends between a proximal stem end and a distal stem end, and a coupling end portion that extends from the distal stem end. In the coupling end portion, at least one annular groove is formed, which is distally delimited by a distal annular ridge that defines a maximum outer diameter of the coupling end portion. The maximum outer diameter of the coupling end portion is smaller than the inner diameter of the threaded cylindrical stem in such a way that the coupling end portion may be inserted with play into a threaded hole wherein the threaded pin may be screwed, the distal annular ridge being suitable for insertion between the ridges of the female thread of the threaded hole.