Below are two examples that show how the flatness tolerance symbol is specified with and without MMC. This is what that means Flatness Tolerance Drawing Calloutįlatness can be specified with or without MMC or LMC modifiers. The flatness tolerance zone consists of two parallel planes that create the boundary within which all specified surface points should lie. Must Read: GD&T symbols with examples Flatness Symbol Flatness Tolerance Zone When flatness tolerance is specified on top of any dimensional tolerance, then the flatness tolerance is always less than the dimensional tolerance.įlatness is the 3D version of straightness tolerance and needs to be measured all across the specified surface. If any part is way out of the specified flatness tolerance, it may not be accepted in production as it may not fulfill the purpose. Since perfect flatness is not possible, flatness tolerance is specified on drawings so that the part can be flat enough to function properly. That means how much deviation is allowed for the surface to deviate with respect to its perfectly flat form. That is why most of the engineering drawings specify flatness tolerance. When a surface is perfectly flat ( Theoretical), all surface points should rest on the same plane. Let’s learn more about flatness tolerance in this article. That tolerance is called flatness tolerance. We have to have some tolerance for how flat a surface should be. Right? It’s next to impossible to make a perfectly flat surface.
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