What Are the ANSI Y14.5 Drafting Standards?

ANSI Y14.5 drafting standards are a set of guidelines that describe the design language of the geometric dimensioning and tolerancing. The American Society of Mechanical Engineers has developed these standards to provide precise, well-defined conventions for use in geometric drawings of engineering parts and assemblies.

The Y14.5 standards use a language of symbols to describe the geometric characteristics for different types of tolerances. The GD&T serves to provide uniform drawing specifications that allow manufacturers to produce quality parts with the desired form, fit and functionality. It aims to streamline and enhance design communication for modern and technically advanced industrial production.

The ASME revised the Y14.5M-1994 standard to form the ASME Y14.5-2009. It features the restructuring and reorganization of certain sections and materials, and it offers better readability than its predecessor. There are also some important revisions in the areas of feature and size; datum references and degrees of freedom; composite position tolerances; and symbology and modifiers tools.

The ASME Y14.5-2009 is intended for industry professionals, including design, mechanical, quality, process and project engineers. It is also used by computer-aided design and computer-aided manufacturing specialists, inspectors and educators in the field of manufacturing. The Y14.5 standards find important application in aerospace, automotive, medical device, electronic, instrumentation and related industries.