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Category: GD&T Symbol Rules and Examples

Articles related to GD&T symbol rules and walk-through examples of GD&T Symbols and their uses

Free State Symbol

by Jason Richter on June 8, 2022.

The Free State Symbol is in used GD&T to indicate that a specific dimension and its associated tolerance are to be assessed in an unrestrained state.

Projected Tolerance Zone

by Jason Richter on June 6, 2022.

The Projected Tolerance Symbol is in used GD&T to indicate the tolerance zone of a feature is to be assessed beyond the surface extents of the feature.

Continuous Feature

by Jason Richter on May 17, 2022.

The Continuous Feature Symbol is used to indicate that a group of disjointed features or surfaces are to be considered as one continuous feature.

Datum Target

by Jason Richter on March 28, 2022.

The Datum Target Symbol is used to define a specific point, line, or area to be used in order to establish a datum on a drawing.


by Jason Richter on March 9, 2022.

The Independency Symbol is used on drawings to declare that the requirement for perfect form at MMC or LMC is removed and the form tolerance may be larger than the size tolerance. This symbol only exists in the ASME Y14.5 standards, not the ISO GPS standards.