302 Geometric Dimensioning and Tolerancing Copyright Goodheart-Willcox Co., Inc. Angularity Tolerance Angularity is the condition of a surface, center plane, or axis at any specified basic angle from a datum plane or datum axis. An angularity tolerance specifies a tolerance zone formed by two parallel planes or parallel lines, or a cylindrical tolerance zone, oriented at any specified basic angle to a datum and within which the controlled sur- face, center plane, or axis of the feature must lie. An angularity tolerance can apply to a feature at an implied 90° angle (perpendicular), implied 0° angle (parallel), or any other basic angle from the datum. Example 7-19 details the angularity geometric char- acteristic symbol and associated feature control frame. Angularity of a Surface When applying an angularity tolerance to a surface, the feature control frame nor- mally connects to the surface by a leader, but it can attach to an extension line from the surface. The specified angle must be basic and dimensioned from the datum feature, as shown in Example 7-20. No material condition modifier can be used, because the feature to which the angularity applies does not have size. H = Letter height Symbol Specifications 1.5H H 2H 30° Goodheart-Willcox Publisher Example 7-19. A feature control frame with the angularity geometric characteristic symbol.