The invention relates to a coupling comprising at least two parts (10, 11) to be assembled and a bolt (1), said bolt (1) including a screw (2) provided with a screw head (4) and with a threaded portion (5), and a nut (3) provided with a threaded portion (8) capable of engaging with said threaded portion (5), in order to clamp said two parts (10, 11) between said screw (2) and said nut (3), said at least two parts (10, 11) being provided with a bore (12) arranged so as to enable said threaded portion (5) to pass therethrough. Said bolt (1) includes a penetration cone (6) secured either to the screw (2) or to the nut (3), said penetration cone (6) being provided with at least two teeth (7), and the crimping diameter of the penetration cone (6), which is defined as the maximum diameter thereof, is greater than the diameter of the bore (12) by a value of 4 to 6% of the nominal diameter of the screw.