Racon cutting ring for metal pipes.

The present invention concerns a fitting (1) for a tube (10) with a connection (4) having an opening (8) for the pipe (10), a nut (6) THREADED with the connection (4) and a cutting ring (18) METALICO mounted between the connection and the nut (6). The cutting ring (18) cooperates with an outer cone (30) and an inner cone (28) of the connection (4) so ​​that tightening the nut (6) penetrated with a cutting edge (32) at least at the DUCT MATERIAL (10). The cutting ring (18) adjacent the outer cone (30) has a stop member (38) BASICALLY SURFACE FOR LIMITING RADIAL TIGHTEN abutment against a front surface (40) of the connection (4). The cutting ring (18) has, in the transition between the outer cone (30) and the abutment surface (38), a circumferential seal (44) ELASTOMERIC So when the circumferential BOARD (44) is set MOUNTED, SE HALLA elastically prestressed between the cutting ring (18) on one side and part of the inner cone (28) at least of the connection (4) following the front surface (40) for another.