Device for coupling (connecting) tubes (18) including a body (1) provided with a bore (2) to receive the end of this tube and means for retaining the tube in the bore, which device is made up of a substantially frustoconical washer (13) of which the internal circumference is of smaller diameter than that of the tube and is divided into a plurality of teeth (14), the outer part of the washer being located in a groove (12) formed in the bore (2). Each tooth (14) of the washer is made up of a bladelet (14) having a root part (15) and being of small height which at rest extends in a radial plane and an active part (16) inclined to the radial plane of the root (15) and is connected to the adjacent teeth (14) by a peripheral linkage part (17) of small cross-section and of which the length (L) is at least equal to the length (l) of each tooth 14. <IMAGE>
