Angularity defines a condition between two related planes, surfaces, or lines which are not perpendicular or parallel to one another. Angularity tolerances control this relationship.
The specified angle is a basic dimension, and is defined by a theoretically exact boxed dimension and must be accompanied by a tolerance zone. This zone is the area between two parallel lines inclined at the specified angle to the datum line, plane, or axis. The tolerance zone may also be the space within a cylinder, the tolerance value being equal to the cylinder diameter: In this case, symbol 0 precedes tolerance value in the tolerance frame.
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