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Orientation Tolerance on a Surface

As shown in the animation, the Orientation tolerance of Parallelism on the surface refines the variation due to Size. The Size is defined across the Datum and the feature under measurement. Hence once Size variation is accounted for, a separate accounting of the Orientation tolerance is not required to be done.

This principle applies to all other Orientation tolerances (Perpendicularity and Angularity) that may be applied in such a manner.