GD&T Symbols

GD&T (Geometric Dimensioning and Tolerancing) symbols are standardized symbols used on engineering drawings to precisely communicate the features and allowable variations of a part's geometry. These symbols specify how much a feature can deviate from its ideal shape or position, ensuring parts fit and function correctly. For example, symbols indicate whether a hole must be perfectly round, located within a certain area, or aligned in a specific way. This precise language helps manufacturers produce parts consistently, reduces errors, and ensures interoperability in complex assemblies.