Chapter 9 Profile Tolerances 327 A B C E E D D Example 9-12. Unilateral and unequally disposed profi le of a surface tolerance applications. A— Applying the unilateral profi le tolerance where the entire profi le tolerance provides additional material to the feature or part. This is the preferred ASME Y14.5 use for this application. B—Applying the unilateral profi le tolerance where the entire profi le tolerance removes material from the feature or part. This is the preferred ASME Y14.5 use for this application. C—Applying an unequally disposed profi le tolerance. This is the preferred ASME Y14.5 use for this application. D—An alternate method when an unequally disposed profi le tolerance is required uses a basic dimension to indicate where the tolerance zone is intended. E—An alternate option when a unilateral profi le tolerance is required uses a short phantom line on the side of the true profi le to indicate where the tolerance zone is intended. An alternate option used when a unilateral profile tolerance is required is to draw a short phantom line on the side of the true profile where the unilateral tolerance zone is intended. The feature control frame is connected to the feature with a leader as shown in Example 9-12E. Note Example 9-12 shows six methods of applying profi le tolerances. An actual drawing would only show one profi le tolerance application. Non-Uniform Profile Tolerance Zone A non-uniform profile tolerance zone is specified by a maximum material boundary and a least material boundary of a unique shape. The boundaries are defined on a drawing by basic dimensions with phantom lines used to indicate that the tolerance zone or the boundaries may be defined in a CAD file. The term NON- UNIFORM replaces the tolerance value in the feature control frame and the leader line points to the true profile. Example 9-13 shows an application of a non-uniform profile tolerance.