288 Geometric Dimensioning and Tolerancing Copyright Goodheart-Willcox Co., Inc. Meaning Datum axis A SECTION A-A ∅0.2 Parallelism tolerance zone at MMC ∅1.2 Parallelism tolerance zone at LMC Orthographic View Model View 11.5 0.2 11.6 0.3 11.7 0.4 Possible Feature Sizes Diameter Tolerance Allowed 11.8 0.5 11.9 0.6 12.0 0.7 12.1 0.8 12.2 0.9 12.3 1.0 12.4 1.1 12.5 1.2 Goodheart-Willcox Publisher Example 7-6. Specifying parallelism of an axis relative to a datum axis with the tolerance applicable at MMC.