GD&T Symbol

GD&T (Geometric Dimensioning and Tolerancing) symbols are visual tools used in engineering drawings to specify precise allowable variations in a part's shape, size, and position. Each symbol indicates a specific geometric requirement, such as flatness, roundness, parallelism, or perpendicularity. These symbols communicate how much a feature can deviate from its ideal form, ensuring parts fit and function correctly while allowing some flexibility in manufacturing. Overall, GD&T symbols help maintain quality and consistency by clearly defining the geometric tolerances necessary for proper assembly and performance.