ISO 10303-214:2010(E)
A Symmetry_tolerance is a constraint on the amount of deviation a toleranced element may have from being symmetrical to a datum. Any edge or (median) plane of the part must lie in a tolerance zone limited by two parallel lines or planes, symmetrically located with respect to a datum.
A Symmetry_tolerance is a type of Geometric_tolerance.
The data associated with a Symmetry_tolerance are the following:
The affected_plane specifies the plane in which the tolerance applies.
This attribute covers information that is given on drawings implicitly by the drawing plane. If the affected_plane is not specified, the tolerance applies in all directions (on drawings indicated by the diameter symbol) .
See symmetry_tolerance to reference_plane for the application assertion.
The affected_plane need not be specified for a particular Symmetry_tolerance.
The reference_datum specifies the Datum_reference objects that define the reference for this type of geometric tolerance.
See symmetry_tolerance to datum_reference for the application assertion.
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