It is also useful where two surfaces must meet flush and form a tight seal, as with two surfaces bolted together with a gasket in between. The characteristic of flatness is useful in helping to ensure even wear across a surface. ![]() Symbolized in GD&T by a parallelogram, flatness allows you to limit waviness or variation in a surface without tightening its dimensional tolerance. ![]() What is surface flatness?įlatness is a measure of a surface’s form compared against itself, indicating that all the points along the surface lie in the same plane. It can also be an important consideration when optimizing for manufacturability.Īlong with positioning, cylindricity, and other geometric tolerancing characteristics, flatness tolerance may be indicated on an engineering drawing to help ensure the metal parts that are produced will have both the correct form and the desired functionality. Surface flatness is one of the Geometric Dimensioning and Tolerancing (GD&T) standards used to communicate how a part should be manufactured. ![]() Does flatness matter in small parts production?
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