By providing uniformity in drawing specifications and interpretation, GD&T reduces guesswork throughout the manufacturing process - improving quality, lowering costs, and shortening deliveries. GD&T is an essential tool for communicating design intent - that parts from technical drawings have the desired form, fit, function and interchangeability.
The Y14.5 standard is considered the authoritative guideline for the design language of geometric dimensioning and tolerancing (GD&T.) It establishes symbols, rules, definitions, requirements, defaults, and recommended practices for stating and interpreting GD&T and related requirements for use on engineering drawings, models defined in digital data files, and in related documents.
