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          GD&T

          GD&T Symbols Reference Guide from Sigmetrix

          By
          2 Minute Read

          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.

          Are you looking for GD&T training? We teach GD&T so every team member:

          • Understands what the GD&T means
          • Understands how the GD&T works
          • Understands the effect of the GD&T on product function, manufacturing, inspection, and assembly
          • Understands the effects of the GD&T throughout the product lifecycle

          We ensure that your design, manufacturing, inspection, assembly, quality, and service personnel and your suppliers understand GD&T as needed to be successful and produce the highest quality, lowest cost products possible.

          SEE ALL AVAILABLE GD&T COURSES

          To download your copy of the free GD&T Symbols Reference Guide, please click here.

           

           

          GD&T Symbol Control Type Name Summary Description
          GDT_Symbols_Straightness

           

          Form Straightness Controls the straightness of a feature in relation to its own perfect form
          GDT_Symbols_Flatness

           

          Form Flatness Controls the flatness of a surface in relation to its own perfect form
          Sigmetrix_GDT_Symbols_Circularity

           

          Form Circularity Controls the form of a revolved surface in relation to its own perfect form by independent cross sections
          Sigmetrix_GDT_Symbols_Cylindricity

           

          Form Cylindricity Like circularity, but applies simultaneously to entire surface
          GDandT_Symbols_Profile_of_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.
          GDandT_Symbols_Profile_of_Line

           

          Profile Profile of a Line Similar to profile of a surface, applies to cross sections of a feature
          Sigmetrix_GDandT_Symbol_Perpendicularity

           

          Orientation Perpendicularity Controls the orientation of a feature which is nominally perpendicular to the primary datum of its datum reference frame
          Sigmetrix_GDandT_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_GDandT_Symbol_Parallelism

           

          Orientation Parallelism Controls orientation of a feature which is nominally parallel to the primary datum of its datum reference frame
          Sigmetrix_GDT_Symbol_Position

           

          Location Position Controls the location and orientation of a feature in relation to its datum reference frame
          Sigmetrix_GDT_Symbol_Concentricity

           

          Location Concentricity Controls concentricity of a surface of revolution to a central datum
          Sigmetrix_software_GDandT_symbol_Symmetry

           

          Location Symmetry Controls the symmetry of two surfaces about a central datum
          Sigmetrix_software_GDandT_symbol_circular_runout

           

          Runout Circular runout Controls circularity and coaxiality of each circular segment of a surface independently about a coaxial datum
          Sigmetrix_software_GDandT_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
          GDT_Symbol_Least_Material_Condition

           

          MMC –
          Maximum Material Condition
          GDandT_Symbols_Tangent_Plane

           

          Tangent Plane
          GDandT_Symbols_Projected_Tolerance_Zone

           

          Projected Tolerance Zone
          Sigmetrix_GDT_Symbol_Free_State

           

          Free State
          Sigmetrix_GDT_Symbol_Diameter

           

          Diameter
          Sigmetrix_GDT_Symbol_Radius

           

          Radius
          Sigmetrix_software_GDandT_symbol_Spherical_Radius

           

          Spherical Radius
          Sigmetrix_software_GDandT_symbol_Spherical_Diameter

           

          Spherical Diameter
          Sigmetrix_software_GDandT_symbol_Controlled_Radius

           

          Controlled Radius
          GDT_Symbols_Statistical_Tolerance

           

          Statistical Tolerance
          Sigmetrix_GDT_Symbol_Basic_Dimension

           

          Basic Dimension
          Sigmetrix_GDT_Symbols_Reference_Dimension

           

          Reference Dimension
          Sigmetrix_software_GDandT_symbol_places

           

          Places
           
          Symbol Meaning
          GDT_Symbols_Dimension_Origin

           

          Dimension Origin
          GDT_Symbols_Counterbore

           

          Counterbore
          Sigmetrix_software_GDandT_symbol_Countersink

           

          Countersink
          Sigmetrix_software_GDandT_symbol_Depth

           

          Depth
          Sigmetrix_GDandT_All_Around_Symbol

           

          All Around
          Sigmetrix_software_GDandT_Between_symbol

           

          Between
          Sigmetrix_software_GDandT_Target_Point_symbol

           

          Target Point
          GDandT_Conical_Taper_Symbol

           

          Conical Taper
          GDandT_Slope_Symbol

           

          Slope
          GDT_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.

          Sigmetrix Team

          Sigmetrix Team

          For more than 30 years, we’ve developed innovative software solutions to help enterprises produce better products. Our expertise helps companies ensure design intent aligns with manufacturing processes, enabling companies to achieve higher quality and efficiency in product development and manufacturing.

          Author