of screw 10 with a shape matching the oblong orifice 9 and which delimits with head 13 of screw 10 an annular groove 14 as illustrated in fig4 it will be noted that stop 11 delimits two protuberances 15 and 16 which ensure that the clamping means are locked in translation when it is necessary to arrange the ring 2 in the area of connection of the two members of the exhaust system and thus ensure hermetic connection between them it should also be emphasized that bearing lugs 5 and 6 have on either side of a vertical median plane a reinforcing side piece 17 which can be produced by appropriately upsetting the metal sheet during manufacture of the ring 2 these reinforcing side pieces 17 delimit in the lug 5 a housing 18 and inside the lug 6 a housing 19 inside the housing 19 is placed a bearing ring 20 which is substantially square in shape and in which is provided substantially in its central portion an orifice 21 designed to take up a position facing an oblong orifice 22 provided in bearing lug 6 this bearing ring 20 cooperates with a nut 23 such as the one that is more particularly illustrated in fig5 and which comprises a cylindrical body 24 with an outside diameter that is substantially smaller than the inside diameter of orifice 21 and of oblong orifice 22 so as to be able to pass through them this cylindrical body 24 is hollow 1 and it has an internal threaded portion 25 designed to cooperate with the thread of threaded shank 12 the other.