Geometric Dimensioning & Tolerancing

Geometric Dimensioning and Tolerancing (GD&T) is a system used in engineering and manufacturing to define and communicate tolerances and design intent for parts and assemblies. It provides a clear and concise way to describe the allowable variation in a part's geometry, ensuring that it meets the desired specifications for proper fit, form, and function.

GD&T is governed by standards like ASME Y14.5 in the United States and ISO 1101 internationally. It improves communication between designers, manufacturers, and quality control, reducing errors and ensuring parts are interchangeable and function as intended.