GD&T symbols chart and reference materials. Geo Symbol Chart PDF · ASME and ISO Standands related to Product Defination and Metrology PDF. Created by Tony Cantrell on Mar 9, AM. Last modified by Tony Cantrell on Mar 9, AM. GD&T Color ( KB) View Download. The Tec-Ease GD&T Glossary and free resource features explainations of Use this quick reference to find definitions of common GD&T symbols and terms.

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Position is always used with a feature of size. Controls the orientation of a feature which is nominally perpendicular to the primary datum of its datum reference frame.

Profile of a line is a 2-Dimensional tolerance range that can be applied to any linear tolerance. Profile of a surface describes a 3-Dimensional tolerance zone around a surface, usually which is an advanced curve or shape.

Controls circularity and coaxiality of each circular segment of a gf&t independently about a coaxial datum. The feature control frame consists of four pieces of information: Concentricity, sometimes called coaxially, is a tolerance that controls the central axis of the referenced feature, to a datum axis.

It is essentially a control of a circular feature, and how much variation it has[…].

GD&T Symbols

Yes Uncommon Drawing Callout: Controls orientation of a feature which is nominally parallel to the primary datum of its datum reference frame. In addition it controls the location and orientation when a datum reference frame is used. Axis Parallelism is a tolerance[…].


If it shmbols called out[…]. It can reference a 2D line referenced to another 2D element, but more commonly it relates the orientation of one surface plane[…]. Sometimes called roundness, circularity is a 2-Dimensional tolerance that controls the overall form of a circle ensuring it is not too oblong, square, or[…]. It comes in useful if hd&t feature is to be defined on a drawing that needs to be uniformly flat without tightening any other dimensions on the drawing.

A datum feature is usually an important functional feature that needs to be controlled during measurement as[…]. Angularity is the symbol that describes the specific orientation of one feature to another at a referenced angle.

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In its normal form or Surface Straightness, is a tolerance that controls the form of a line somewhere on the surface or the feature. Designers and engineers utilize this international language on their drawings to accurately describe part features on the basis of size, form, orientation and location. The flatness tolerance references two parallel planes parallel to the surface that it is called out on that define a zone where the entire reference surface must lie.

Controls size and form of a feature. The circularity symbol is used to describe how close an object should be to a true circle.

Surface Perpendicularity is controlled with two parallel planes acting as its tolerance zone. Cylindricity is a 3-Dimensional tolerance that controls the overall form of a cylindrical feature to ensure that it is round enough and straight enough along[…].


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Sigmetrix is premier source for tolerance analysis and design optimization software, training, and engineering solutions. Controls orientation of a feature at a specific angle in relation to the primary datum of its datum reference frame.

The axes for the datum and referenced feature are derived from the median points of the part or feature. If it is a hole or internal feature: Controls chzrt, straightness, coaxiiality, and taper of a cylindrical surface about a coaxial datum.

Profile of a line describes a tolerance zone around any line in any feature, usually of a curved shape. Axis Straightness is a tolerance that controls how much curve is allowed in the[…].

Controls the form of a revolved surface in relation to its own perfect form by independent cross sections. None — Always Implied default condition abbreviated: The Cylindricity symbol is used to describe how close an object conforms to a true symbold.

Feature of Size Definition: Axis Perpendicularity is a tolerance that[…]. Total runout controls both the amount of variation in the surface as the part is[…].

Therefore saving your company time and money in the long run. The normal form or Surface Parallelism is a tolerance that controls parallelism between two surfaces or features.