GD&T Symbols Reference Guide from Sigmetrix
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In geometric dimensioning and tolerancing (GD&T), a unique set of GD&T symbols are used to define the relationships between part features and measurement references. Designers and engineers utilize this international language on their drawings to accurately describe part features on the basis of size, form, orientation and location.
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|GD&T Symbol||Control Type||Name||Summary Description|
|Form||Straightness||Controls the straightness of a feature in relation to its own perfect form|
|Form||Flatness||Controls the flatness of a surface in relation to its own perfect form|
|Form||Circularity||Controls the form of a revolved surface in relation to its own perfect form by independent cross sections|
|Form||Cylindricity||Like circularity, but applies simultaneously to entire surface|
|Profile||Profile of a Surface||Controls size and form of a feature. In addition it controls the location and orientation when a datum reference frame is used.|
|Profile||Profile of a Line||Similar to profile of a surface, applies to cross sections of a feature|
|Orientation||Perpendicularity||Controls the orientation of a feature which is nominally perpendicular to the primary datum of its datum reference frame|
|Orientation||Angularity||Controls orientation of a feature at a specific angle in relation to the primary datum of its datum reference frame|
|Orientation||Parallelism||Controls orientation of a feature which is nominally parallel to the primary datum of its datum reference frame|
|Location||Position||Controls the location and orientation of a feature in relation to its datum reference frame|
|Location||Concentricity||Controls concentricity of a surface of revolution to a central datum|
|Location||Symmetry||Controls the symmetry of two surfaces about a central datum|
|Runout||Circular runout||Controls circularity and coaxiality of each circular segment of a surface independently about a coaxial datum|
|Runout||Total runout||Controls circularity, straightness, coaxiiality, and taper of a cylindrical surface about a coaxial datum|
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