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1. GD&T Symbols Reference
SEE WHAT YOU’RE MISSING Copyright © Sigmetrix, LLC
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
SEE WHAT YOU’RE MISSING Copyright © Sigmetrix, LLC
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
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