Do the tolerances on diameters and wall thickness given in B16.9 or MSS SP75 apply throughout the fitting?

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Do the tolerances on diameters and wall thickness given in B16.9 or MSS SP75 apply throughout the fitting?

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No. The tolerances on diameters (I.D. or O.D. ) apply only at the ends. The minimum wall thickness applies throughout the fitting, but there is no maximum wall other than that implied at the ends based on diameter tolerances.