Basic dimension

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In technical drawing, a basic dimension is a theoretically exact dimension, given from a datum to a feature of interest. In Geometric dimensioning and tolerancing, basic dimensions are used to communicate the critical design dimensions of a part. Basic dimensions represent an ideal case and as such, have no tolerance. To facilitate manufactureability, a feature control frame is often used to assign a manufacturing tolerance to a basic dimension.

Basic dimension are denoted by enclosing the number of the dimension in a rectangle.