Common GD&T Symbols

Geometric Dimensioning and Tolerancing GD&T uses symbols to represent feature characteristics and dimensions. Here is a list of the most common symbols you’ll use when writing and reading GD&T:
Geometric Category refers to whether or not the Feature Control Frame includes a Datum Reference Frame (DRF.) Tolerances for individual features do not have DRF’s. Tolerances for related features control one or more features relative to the specified DRF.
Using GD&T Geometric Dimensioning and Tolerancing
GD&T is applied using symbols and Datums. Click below to see common symbols, and to better understand Datums and Material Conditions

Learn about using common GD&T symbols

Learn about the value and ROI of GD&T

Find out how Material Modifiers affect specifications

Where Do You Start with GD&T?
GD&T is applied using symbols and Datums. Click below to see common symbols, and to better understand Datums and Material Conditions
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