Patent ID: 7665772

Claim:
A metallic cutting ring for a screw connection for sealingly connecting a tube to an attachment part, the cutting ring having an outer periphery and comprising: a tube abutment section, and a cutting section adjoining the tube abutment section in an axial direction; with the cutting section including cutting edges and a stop; said edges being disposed in said cutting section opposed to said attachment part; wherein said stop: is disposed closer to said tube abutment section than said edges, is directed radially outward from the outer periphery of the cutting ring, said outer periphery having an outer diameter, and includes a stop face for the attachment part which is disposed transversely to a cutting ring longitudinal axis, wherein the stop has an annular peripheral stop edge which extends beyond the stop face; wherein the stop edge divides the stop face into an inner and an outer annular partial face which are concentrically disposed to each other; wherein the partial faces have respectively different angles of inclination relative to the cutting ring longitudinal axis; wherein the inner partial face widens conically in the direction of the attachment part; wherein the outer partial face narrows conically in the direction of the attachment part; and wherein an obtuse angle is enclosed between the partial faces.