Form tolerances are applicable to single (individual) features or elements of single features; therefore, form tolerances are not related to datums. The following subparagraphs cover the particulars of the form tolerances — straightness, flatness, circularity, and cylindricity.
6.4.1 Straightness. Straighmess is a condition where an element of a surface, or an axis, is a straight line.
straightness tolerance specifies a tolerance zone within which the considered element or derived median line must lie. A straightness tolerance is applied in the view where the elements to be controlled are represented by a straight line.
18.104.22.168.1 Cylindrical Features. Figure 6-1 shows an example of a cylindrical feature where all circular elements of the surface are to be within the
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