Connecting element, in particular a bolt or a nut, preferably for fastening a wheel, or rim, to a hub of a vehicle

1) A connecting element (10, 100, 100′), in particular a bolt or a nut, preferably for fastening a wheel, or rim, to a hub of a vehicle, especially of a motor vehicle such as a motor car;

• comprising a body (12) having a respective outer perimeter surface (14) which extends along a respective imaginary profile, in particular an imaginary circular profile, there being formed, at the perimeter surface, respective means (16) for the engagement of corresponding means or tool (200) for screwing and/or unscrewing the connecting element;
• and screw thread means (21) for fastening, preferably to the vehicle hub;
• the engagement means (16) comprising a plurality of perpendicularly extending and circumferentially distributed engagement troughs (18), these engagement troughs being recessed relative to the imaginary outer profile and each being separated from the adjacent trough (18) by a respective perimetrically extending outer transit zone (19);
• wherein the width (r) of the transit zone (19) between adjacent engagement troughs (18, 18) is less than the width (i) of the respective trough (18), in particular the width (r) of the outer transit zone (19) being less than half the width (i) of the trough (18), and more particularly, the width (r) of the outer transit zone being less than a quarter of the width (i) of the trough (18);
• the width (r) of the transit zone (19) being preferably less than a sixth of the width (i) of the trough (18) and still more preferably, the width (r) of the transit zone (18) being less than a seventh of the width (i) of the trough (18).