#Industry News
GD&T Symbols
A Comprehensive Guide, Explained
GD&T, short for Geometric Dimensioning and Tolerancing, is a universally accepted system used to precisely communicate part design requirements on engineering drawings. The standard includes 14 main symbols that represent different geometric controls.
1. Straightness
2. Flatness
3. Circularity
4. Cylindricity
5. Line Profile
6. Surface Profile
7. Parallelism
8. Perpendicularity
9. Angularity
10. Concentricity
11. Symmetry
12. Position
13. Circular Runout
14. Total Runout
For detailed GD&T symbol definitions and related information, please click the link below.
In GD&T, think of feature symbols as powerful codes—not just pictures, but carriers of key information. When these symbols are used in conjunction with other design elements, they establish rules for how accurately certain features on a part can be formed. This article breaks down the key GD&T symbols from five aspects: shape tolerance, contour tolerance, orientation tolerance, position tolerance, and runout tolerance.
