This document provides a reference for geometric dimensioning and tolerancing (GD&T) symbols, including: 1) A table listing common GD&T control types, their symbols, and brief descriptions; 2) A table listing additional GD&T symbols and their meanings; 3) Information about an automated GD&T software solution that can accelerate design processes and reduce manufacturing costs compared to manual GD&T methods.

1. GD&T Symbols Reference
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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
³ Form Cylindricity Like circularity, but applies simultaneously to entire surface
º 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.
¹ Profile Profile of a Line Similar to profile of a surface, applies to cross sections of a feature
¼ Orientation Perpendicularity
Controls the orientation of a feature which is nominally
perpendicular to the primary datum of its datum reference frame
² 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
µ 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
½ Runout Circular runout
Controls circularity and coaxiality of each circular segment of a
surface independently about a coaxial datum
¾ Runout Total runout
Controls circularity, straightness, coaxiiality, and taper of a
cylindrical surface about a coaxial datum

2. GD&T Symbols Reference
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Symbol Meaning Symbol Meaning
Ë LMC – Least Material Condition Ê Dimension Origin
Ì MMC – Maximum Material Condition Ö Counterbore
Ò Tangent Plane Õ Countersink
Î Projected Tolerance Zone É Depth
Å Free State ¤ All Around
Ø Diameter ¯ Between
Ù Radius × Target Point
Ú Spherical Radius Í Conical Taper
Û Spherical Diameter Ï Slope
Ü Controlled Radius Ô Square
Æ Statistical Tolerance
{77} Basic Dimension
(77) Reference Dimension
5X Places
Our GD&T Advisor software solution provides the automation you need to make manual GD&T methods a thing
of the past! This 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.
This reference guide brought to you compliments of Sigmetrix – the world leader in tolerance analysis and
design optimization solutions. To learn more about the GD&T Advisor solution or any of our tolerance analysis
software and services, contact us at info@sigmetrix.com.