Method of making metal gaskets

A method of making a conical metal gasket which comprises providing a hollow cylindrical blank formed of a first metallic material, first coating said hollow cylindrical blank on its inner and outer cylindrical surfaces with a uniform thickness of a second metallic material to form a cylindrical inner surface coating layer and a cylindrical outer surface coating layer on said inner and outer cylindrical surfaces, said second metallic material being softer than said first metallic material, then conically cutting the wall and said inner and outer surface coating layers of said coated cylindrical blank along an angle with respect to the central axis of the cylindrical blank to form a cut surface with sharpened end edges of said coating layers, said sharpened end edges lying on a uniform conical surface of revolution about the central axis of said cylindrical blank, and then conically cutting the wall and said inner and outer surface coating layers of the cylindrical blank at a second location to form a second cut surface, said second cut surface being parallel to said first cut surface.