Jason compares three profile tolerancing methods and explains which option he would recommend.
In this question line video, we explain when to use the diameter symbol in a feature control frame. The examples below illustrate the unique tolerance zones shapes and sizes for position, perpendicularity, straightness, runout, and cylindricity controls.
Controls a surface or axis at exactly 90° to a datum. Squareness has a formal definition in GD&T, and this is it.