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Is there a difference in the face to hub dimension of a RF weld neck flange and a FF weld neck flange. Is a FF flange a RF with the 1/16 face ground off?

I was asking if a FF flange was a RF with the RF ground off, or does the flange start as a FF then you remove the outer ring to make it a RF. We are only talking about a 1/16″ in most cases but as you move up in pressure rating the Rf becomes 1/4″.

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