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Regardless of Feature of Size (RFS)

Regardless of Feature Size (RFS) is the default condition of all geometric tolerances by rule #2 of GD&T and requires no callout. Regardless of feature size simply means that whatever GD&T callout you make, is controlled independently of the size dimension of the part.

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RFS Concept — Straightness

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RFS Concept — Flatness

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Inner Boundary

RFS Concept — Internal Feature

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Outer Boundary

RFS Concept — Internal Feature

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RFS Concept — External Feature

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RFS Concept — External Feature

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When a geometric tolerance is applied on an RFS basis, the specified tolerance is independent of the size of the considered feature of size.
A tolerance, other than form, applied RFS on a feature of size establishes a tolerance zone that controls the center point, axis, or center plane of the unrelated AME.
A form tolerance applied RFS on a feature of size establishes a tolerance zone that controls the derived median plane or derived median line.
The tolerance is limited to the specified value regardless of the size of the unrelated AME.

Effect of RFS :