Sealing device

A sealing device for a fluid-tight screw connection, comprising:

• a component (16) that has a threaded bore with a countersink (28) extending into a mouth of the threaded bore, a washer-shaped bottom face (34) of the countersink constitutes a first sealing face of the sealing device,
• a screw-in element (12) that is screwed into the threaded bore and has a radially protruding annular shoulder face oriented toward the component,
• an annular seal ring (30) that is inserted into the countersink of the component and which rests sealingly against the first sealing face, a circumferential wall (33) of the countersink, and against a collar (38) of the screw element that protrudes axially from an annular shoulder face (36) of the screw element, the countersink (28) in the component (16) is at least as deep as the annular seal ring (30) is thick, an end face of said collar constitutes a second sealing face (40), the collar (38) protrudes into the countersink (28) in the component (16) and the collar (38) sealingly presses the annular seal ring (30) against the first and second sealing faces (34, 40) and the circumferential wall (33), radially outside of the countersink (28), the component (16) has a surface (32) oriented toward the screw-in element (12), and once the screw-in element (12) is fully secured to the component (16), the annular shoulder face (36) of the screw-in element rests firmly on the surface (32) (32) radially outside the axially protruding collar (38) to prevent any portion of the seal ring to be exposed to the outside of the device.