Abstract: A rivet structure includes a main body having a first end formed with an enlarged head and a second end formed with an extended column. The main body is provided with four opposite fixing plates each having a tapered face and each having a bottom face. The bottom faces of the four fixing plates form a square shaped configuration. Thus, the rivet structure can be combined with an article rigidly and stably, thereby preventing the rivet structure from being rotated relative to the article.

Abstract: A fastener assembly includes a lock nut secured to an object, and a screw engaged through the other objects and threaded to the lock nut for securing the objects together. The lock nut includes a peripheral flap extended from one end of a tubular member and engaged with the object, and one or more ribs engaged into the object, for preventing the lock nut from rotating relative to the objects. The screw may thus solidly engage with the lock nut. The other end of the lock nut is machined radially outward to engage with the object, and to secure the ribs in the object.