Symmetry is that condition where the median points of all opposed or correspondingly-located elements of two or more feature surface.«; are congruent with the axis or center plane of a datum feature. Where design requirements dictate a need for the use of a symmetry tolerance and symbol, the method shown in Fig. 5-61 may be followed. The explanation given in para. 5.12 applies to the considered feature^), since symmetry and concentricity controls are the same concept, except as applied to different part configurations. Symmetry tolerance and the datum reference can only apply on an RFS basis.
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