Chapter 7 Orientation Tolerances 305 Copyright Goodheart-Willcox Co., Inc. Angularity of a Center Plane and Single Element Control An angularity tolerance, just like parallelism and perpendicularity tolerances, can control the orientation of the center plane of a width feature, such as a slot. This appli- cation establishes a tolerance zone formed by two parallel planes at a specified basic angle to a datum plane between which the center plane of the feature must lie. Angu- larity can also be controlled on a single line element basis by placing the note EACH ELEMENT below the feature control frame. Applying Orientation Tolerances at RFS, MMC, and Zero Orientation Tolerance at MMC RFS is default when the feature control frame does not show a material condition symbol. This means that the geometric tolerance is the same when the feature is manu- factured at any produced size. Orthographic Section View Meaning ∅0.2 Angularity tolerance zone Datum plane A 60° Possible orientation of feature axis Model Section View Goodheart-Willcox Publisher Example 7-22. Controlling the axis of a feature within a cylindrical angularity tolerance zone relative to a datum plane.