334 Geometric Dimensioning and Tolerancing Profile of a Feature to Be Restrained When any geometric tolerance is to be verified with the part in a restrained condition, the features to be used as datum features must be identified. It may also be necessary to specify the force required to restrain the part. Refer to Example 9-20. In the drawing shown, the part relaxes after being removed from the bending press and the profile must be maintained in the restrained condition. Notice that NOTE 1 under the feature control frame specifies the process used and the force required to restrain the part. Because of the releases of internal stresses, after forming the part, it may look like the Profile Tolerance Zone in Free State view in Profile Tolerance Zone in Free State view in Profile Tolerance Zone in Free State Example 9-20. The free state profile tolerance zone limits how far the part can be out of profile. The other 0.3 profile tolerance zone in the restrained condition controls the shape of the part in a simulated assembly condition. The Drawing 2 profile tolerance zone in the free state Profile Tolerance Zone in Free State Example 9-20. Specifying a profi le of a surface tolerance to be verifi ed in a restrained condition.