Quick attachment clamp for external fixation systems

Clamp (1) for an external fixator, preferably of the quick attachment type, comprising: a plurality of attachments (2; 3) for blocking bars and/or bone screws; a connector (5), provided with an at least partially threaded stem (50), which passes through and connects in series said plurality of attachments (2; 3); at least one first attachment (2) comprising two arms (20; 21), connected by a C-shaped flexible bridge (22); said stem (50) passing through said first attachment (2) in an intermediate position between said flexible bridge (22) and the opposite free ends of said arms (20; 21); wherein, at the free ends, said arms (20; 21) define a screw housing seat (23) for a bone screw, said screw housing seat being selectively configurable, varying the deformation of the flexible bridge (22), to clamp bone screws having different diameter.