What do FF, RF, and RTJ stand for in Flange Face and Finish specifications?

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written by Omaa Metal Sources
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What do FF, RF, and RTJ stand for in Flange Face and Finish specifications?

Category: Industrial Flanges
  • FF stands for Flat Face.
  • RF stands for Raised Face.
  • RTJ stands for Ring Type Joint.

These terms describe the surface finish and sealing characteristics of flanges. FF has a flat, smooth face, RF has a raised face with a gasket sealing surface, and RTJ has a groove to accommodate a ring gasket for high-pressure applications.

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