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Differences Between ASME Y14.5-2009 and ASME Y14.5-2018

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Differences Between ASME Y14.5-2009 and ASME Y14.5-2018


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Written and Illustrated by Kelly L. Bramble
15 Pages
Published January 27, 2019
Revision A

The ASME Y14.5-2018 was approved for release in November of 2018. According to my copy of the standard, it was released for purchase in about January of 2019.

This document is my first effort to details the changes and edits between ASME Y14.5-2009 and ASME Y14.5-2018.

Please not that I make no claim as to which standard may or may not be better or is preferred.

The ASME Y14.5-2018 standard is the only dimensioning and tolerancing guideline for the design language of geometric dimensioning and tolerancing (GD&T.) within the United States. This standard establishes industry practices for stating and interpreting dimensioning and tolerancing or "GD&T" and related requirements for use on engineering drawings and 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.

Intended for design, drafting, mechanical, manufacturing, production, tool/gage, quality, process and project engineers, CAD/CAM/CAE specialists, inspectors and educators across a broad range of global manufacturing. Special emphasis on aerospace, automotive, medical device, precision instrumentation and related industries.