Fixing element with head and threaded shaft has internal multi-edged formation provided by tangential surfaces with radial surfaces at their ends joined by convex surfaces for operation by 6-sided key

摘要

The fixing element has a head (2) provided with an internal multi-edged formation in point-symmetry to its axis (5), which is defined by a sawtooth waveform, to provide tangential surfaces (7) with radial surfaces (8,9) at their opposite ends, joined together by coupling surfaces (10) having a convex curvature in the direction of the axis, for allowing operation of the fixing element via a 6-sided key (14).