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ASME Y14.5-2009 Standard
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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.
