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ASME Y14.5-2009 Standard

asme y14.5 2009

Publisher: American Society of Mechanical Engineers

This is the official ASME Y14.5-2009 Standard for Dimensioning and Tolerancing. Revised and updated from the ASME Y14.5M-1994 Standard, this book covers all the rules and principle concepts of GD&T. A copy of this standard belongs in every engineering and inspection department. Published by American Society of Mechanical Engineers.

Description of the Standard from ASME:
The Y14.5 Standard is considered the authoritative guideline for the design language of geometric dimensioning and tolerancing (GD&T.)  It establishes uniform practices for stating and interpreting GD&T and related requirements for use on engineering drawings and in related documents.

GD&T is an essential tool for communicating design intent — that parts from technical drawings have the desired form, fit, function and interchangeability.  By providing uniformity in drawing specifications and interpretation, GD&T reduces guesswork throughout the manufacturing process — improving quality, lowering costs, and shortening deliveries.

Now, a consensus committee of experts has revised Y14.5 for 21st-century applications. Important changes address: 

  • Concept of feature of size
  • Datum references and degrees of freedom
  • Composite position tolerances
  • Surface boundaries and axis methods of interpretation
  • Profile tolerances
  • Symbology and modifiers tools 

Additionally, the subject matter has been restructured for better readability, with profile, orientation, and form now in separate sections, and material within sections reorganized.


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This file last modified 04/13/09