GDT (Geometric Dimensioning and Tolerancing)

Geometric Dimensioning and Tolerancing (GDT) is a system used in engineering and manufacturing to specify precise shapes, sizes, and allowable variations for parts and assemblies. It communicates how accurately components must be made and how they fit and function together, using symbols, notes, and dimensions on technical drawings. GDT ensures that parts can be manufactured consistently within specified limits, which helps maintain quality and interoperability in complex assemblies. Essentially, it provides a clear, standardized language so engineers, designers, and manufacturers understand exactly how parts should be produced and assembled.