Since that time, the ASME standard has been updated in approximately 10-year intervals, most recently in 2018: The modern ASME Dimensioning and Tolerancing standard can trace its roots to the MIL-STD-8 military standard, circa 1949, but it is the 1982 Y14.5 publication that is generally accepted as the first standard to fully incorporate GD&T. Within ASME, Subcommittee 5 of the Y14 Engineering Product Definition and Related Documentation Practices committee is responsible for maintaining and updating the Y14.5 standard. ASME AND HISTORY OF Y14.5ĪSME is an acronym for The American Society of Mechanical Engineers, a non-profit organization founded to advance, standardize, and disseminate engineering knowledge. This article focuses on the ASME Y14.5 standard and provides a brief overview of its history, purpose, and content. The International Organization for Standardization (ISO) publishes a group of standards, known collectively as the Geometrical Product Specifications, or ISO GPS Standards, and the American Society of Mechanical Engineers publishes the ASME Y14.5 Standard. There are two main standards for Geometric Dimensioning and Tolerancing in use today. Knowledge of the GD&T standard that your company uses is essential to ensure that drawing information is being interpreted properly.

This concept is known as standardization, and it is just as important for GD&T as any other language. One way to ensure this common understanding is by publishing a document describing the proper use of the language. In order to communicate accurately in any written language, the writer and the reader must share the same understanding of the symbols and structure of that language. Geometric Dimensioning and Tolerancing, or GD&T for short, is a language of symbols used to communicate information on technical drawings. This article provides an in-depth look at of the contents, history, and purpose of the standard.

ASME Y14.5 is an established, widely used GD&T standard containing all the necessary information for a comprehensive GD&T system.

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