Metal O-ring seal

A joint in a fluid media flow system, comprising:

• a first part of the joint;
• a second part of the joint;
• a space separating the first part of the joint and the second part of the joint;
• and
• a metal O-ring in the space between the first part and the second, the metal O-ring comprising:
• an inner surface having a constant inner diameter;
• an outer surface, wherein the outer surface of the sidewall is machined such that the sidewall has a plurality of thicknesses between a maximum thickness and a minimum thickness;
• and
• wherein the sidewall comprises at least a pair of opposed facets where the sidewall is machined, and
• wherein the sidewall comprises at least a pair of opposed sealing points.

A method of making a metal O-ring comprising,

• obtaining a metal tube with a sidewall having an inner surface and an outer surface, wherein the sidewall has a constant sidewall thickness between the inner surface and the outer surface;
• and
• machining the outer surface of the sidewall such that at least a pair of facets are formed on the outer surface of the sidewall and the sidewall has a variable thickness wherein the minimum thickness of the sidewall is along the pair of facets and wherein at least a pair of opposed sealing points are formed on the sidewall,
• such that a metal O-ring with selectively reduced outer surfaces is provided.