GD&T Update Guide: ASME Y14.5-2009: Changes, Improvements, and Clarifications

If your organization still references older editions of ASME GD&T, the GD&T Update Guide: ASME Y14.5-2009 Changes, Improvements, and Clarifications is a practical way to get aligned without combing through the full standard every time a question comes up. ASME Y14.5 defines the symbols, rules, definitions, defaults, and recommended practices used to communicate and interpret dimensioning and tolerancing requirements on drawings and related product documentation.

This update guide focuses specifically on what changed in the 2009 revision, highlighting the clarifications and improvements that most often affect day-to-day interpretation. It’s designed for engineers, designers, inspectors, and quality teams who already work with GD&T and need a clear reference for what is different, so drawing reviews, supplier communication, and inspection planning remain consistent across the organization.

Keep it as a desk-side reference when comparing older and newer requirements, reviewing legacy drawings, or updating internal practices. It also works well as a training companion: Sigmetrix includes this Update Guide as one of the reference materials used in its computer-based GD&T training curriculum.