GD&T Symbols Reference Guide from Sigmetrix

Sigmetrix’s GD&T Advisor software provides designers and engineers technology integration with popular modeling systems using the current standard in variance GD&T Symbols. Therefore saving your company time and money in the long run.  Our software team not only provides  GD&T Advisor softwaretolerance analysis solutions , training and services.  Contact us now at info@sigmetrix.com.

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
GD&T Symbols Straightness Form Straightness Controls the straightness of a feature in relation to its own perfect form
GD&T Symbols Flatness Form Flatness Controls the flatness of a surface in relation to its own perfect form
Sigmetrix GD&T Symbols Circularity Form Circularity Controls the form of a revolved surface in relation to its own perfect form by independent cross sections
Sigmetrix GD&T Symbols Cylindricity Form Cylindricity Like circularity, but applies simultaneously to entire surface
GD and T Symbol Profile of a 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.
GD and T Symbols Profile of a Line Profile Profile of a Line Similar to profile of a surface, applies to cross sections of a feature
Sigmetrix GD and T Symbol Perpendicularity Orientation Perpendicularity Controls the orientation of a feature which is nominally perpendicular to the primary datum of its datum reference frame
Sigmetrix GD and T Symbol Angularity Orientation Angularity Controls orientation of a feature at a specific angle in relation to the primary datum of its datum reference frame
Sigmetrix GD and T Symbol Parallelism Orientation Parallelism Controls orientation of a feature which is nominally parallel to the primary datum of its datum reference frame
Sigmetrix GD&T Symbol Position Location Position Controls the location and orientation of a feature in relation to its datum reference frame
Sigmetrix GD&T Symbol Concentricity Location Concentricity Controls concentricity of a surface of revolution to a central datum
Sigmetrix software GD and T symbol symmetry Location Symmetry Controls the symmetry of two surfaces about a central datum
Sigmetrix software GD and T symbol circular runout Runout Circular runout Controls circularity and coaxiality of each circular segment of a surface independently about a coaxial datum
Sigmetrix software GD and T symbol total runout Runout Total runout Controls circularity, straightness, coaxiiality, and taper of a cylindrical surface about a coaxial datum

Our GD&T Advisor software solution provides the automation you need to make manual GD&T methods a thing of the past!

Sigmetrix’ unique, state-of-the-art solution accelerates the design process, saving valuable time, and reduces the manufacturing costs like scrap and change orders, saving thousands of dollars every year. Each of our expertly designed software programs the internationally recognized GD&T Symbols throughout the modeling and reporting processes.

Symbol Meaning
GD&T Symbol Least Material Condition LMC –
Least Material Condition
GD&T Symbol Maximum Material Condition MMC –
Maximum Material Condition
GD and T Symbols Tangent Plane Tangent Plane
GD and T Symbols Projected Tolerance Zone Projected Tolerance Zone
Sigmetrix GD&T Symbol Free State Free State
Sigmetrix GD&T Symbol Diameter Diameter
Sigmetrix GD&T Symbol Radius Radius
Sigmetrix software GD and T symbol Spherical Radius Spherical Radius
Sigmetrix software GD and T symbol Spherical Diameter Spherical Diameter
Sigmetrix software GD and T symbol Controlled Radius Controlled Radius
GD&T Symbols Statistical Tolerance Statistical Tolerance
Sigmetrix GD&T Symbol Basic Dimension Basic Dimension
Sigmetrix GD&T Symbols Reference Dimension Reference Dimension
Sigmetrix software GD and T symbol places Places
Symbol Meaning
GD&T Symbols Dimension Origin Dimension Origin
GD&T Symbols Counterbore Counterbore
Sigmetrix software GD and T symbol Countersink Countersink
Sigmetrix software GD and T symbol Depth Depth
Sigmetrix GD and T All Around Symbol All Around
Sigmetrix software GD and T Between symbol Between
Sigmetrix software GD and T Target Point symbol Target Point
GD and T Conical Taper Symbol Conical Taper
GD and T Slope Symbol Slope
GD&T Square Symbol Square

Sigmetrix is premier source for tolerance analysis and design optimization software, training, and engineering solutions. For more information about GD&T Advisor software or any of our tolerance analysis solutions and services,contact us at info@sigmetrix.com or  via our website here.