298 Geometric Dimensioning and Tolerancing Copyright Goodheart-Willcox Co., Inc. B Orthographic View Datum plane A ∅0.2 Perpendicularity tolerance zone at MMC ∅0.7 Perpendicularity tolerance zone at LMC Meaning B Datum plane A ∅0.2 Perpendicularity tolerance zone A A 19.25 0.2 19.2 0.25 19.1 0.35 Possible Feature Sizes ∅ Tolerance Allowed 19.0 0.45 18.9 0.55 18.8 0.65 18.75 0.7 Goodheart-Willcox Publisher Example 7-14. Specifying a perpendicularity tolerance to control a feature axis relative to a datum plane. A—Regardless of feature size application. B—Maximum material condition application.