A fixation clamp (10), more particularly for use in an external fixation system for holding bone fragments adjacent to each other with the help of fixation elements, comprises at least one clamping assembly (20, 30) having at least one reception (71, 73) to accommodate a fixation element along the longitudinal axis of the reception (71, 73) and at least one locking element (40) extending through the clamping assemblies (20, 30) for blocking the position of the clamping assemblies (20, 30) in a defined angular position. Between said locking element (40) and said at least one clamping assembly (20) there is arranged a washer (41) comprising a central through opening (84) and a cutout (87) extending radially from said through opening (84) such that said washer is mountable and demountable in essential radial direction to the middle axis of the locking element (40). The cutout (87) has a smaller distance between its sidewalls then the diameter of the through opening (84). The locking element (40) has an essentially circular cross-section below its head portion (44) adapted to fit through the through opening (84) of the washer but larger than the opening of the cutout (87) and comprises at least one pair of beveled surfaces (143) parallelly oriented one to the other and having a distance one from the other being smaller than the distance between the sidewalls of the cutout (87) of the washer (41).
