PRESENTS A FITTING SCREW CORTICAL BONE comprising a shaft with a screw (2) section and a cutting end and self-sharpening (3). The assembly includes a nut (14) including an elastic body (16). BODY ELASTICO (16) can be expanded to allow translational movement of the nut (14) along the axis RADIAL EXPANSION but when it becomes impossible, the translation movement ALSO BE IMPOSSIBLE. THEREFORE, THE NUT (14) DESPLAZASE CAN EVEN ALONG THE SHAFT ROTATION THROUGH THE THREAD ON (2). This allows fast forward NUT ALONG EXPOSED A shaft length, but when it enters a VOLUME RESTRICTED TO PREVENT THE EXPANSION OF elastic body (16), further forward only can be achieved by relative rotation.
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