Fixation device for pins to be attached to an external fixation system, comprising: a first attachment or clamp comprising a first pair of opposite jaws (2) for housing at least one pin, said first pair of jaws (2) being formed by a lower jaw element (20) and an upper jaw element (30) a second attachment comprising a second pair of opposite jaws (6) that define together at least one seat for housing a rod of the external fixation system a first clamping screw (4) for clamping the first pair of jaws (2) in order to lock in position the at least one pin, said first clamping screw (4) screwing along a screw axis (X) one of said jaw elements (30) of the first pair of jaws (2) having at least one appendix (33) on its outer edge that is shaped to interact with a corresponding recess (23) made on the other jaw element (20) of the first pair of jaws (2) so that the only possible sliding will be along the screw axis (X) of the first clamping screw (4) a second clamping screw (5) for clamping the second pair of jaws (6) onto the rod, said lower jaw element (20) of the first attachment having a projecting portion (21) with a hole (22) which the second clamping screw (5) passes through, wherein the second pair of jaws (6) is held in an open position by an elastic element (8) housed in an annular seat made around the hole (22) on the projecting portion (21), the second clamping screw (5) passing through the spring (8).
