GD&T Symbols - Geometric Dimensions & Tolerance Symbols

GD&T Symbols - Geometric Dimensions & Tolerance Symbols 

GD&T stands for Geometric dimensions and Tolerances, It is symbolic language used to define the nominal or allowable tolerances and variations in models or drawings. 

GD&T helps designers to say “what they mean?” with regard to their design models or drawings.

 ASME Y14.5 standard has standardized Geometric Dimension and Tolerance symbols in detail.

Lets Learn about GD&T Symbols in this article.....

Note- To know the more about any symbol, Please click on the symbol name...

There are Five category of GD&T symbols that are used to define a part design intent accurately. and these five symbols includes 14 GD&T symbols that control part features and geometry.

Geometric Dimension and Control Tolerance (GD&T) Symbols:

SYMBOLS	GEOMETRIC CHARACTERISTICS
	STRAIGHTNESS
	FLATNESS
	CIRCULARITY (ROUNDNESS)
	CYLINDRICITY
	POSITION
	SYMMETRY
	CONCENTRICITY
	ANGULARITY
	PARALLELISM
	PERPENDICULARITY
	PROFILE OF A SURFACE
	PROFILE OF A LINE
	CIRCULAR RUNOUT
	TOTAL RUNOUT

Feature Control Frame:

GD&T Modifier Symbols:

	LMC-  LEAST MATERIAL CONDITION
	MMC-  MAXIMUM MATERIAL CONDITION
	DIAMETER
	RADIUS
	SPHERICAL RADIUS
	CONTROLLED RADIUS
	DATUM