If you like Don's Tips, you will love our products, produced with the same quality by the same author.

New Release! The GD&T Hierarchy Coach is a self-paced GD&T Fundamentals training package in accordance with ASME Y14.5-2009. The GD&T Hierarchy Coach
Hierarchy Text
Hierarchy Wall Chart
Hierarchy PowerPoint
Hierarchy Workbook

Free GD&T Tips

Tec-Ease, Inc. is passionate about GD&T (Geometric Dimensioning and Tolerancing) and we want to help ensure you apply the Y14.5 Standards correctly. This is one reason we offer these GD&T Tips for free! If you would like additional help understanding the concepts in the Standard, we also provide some of the best GD&T training (On-site, Public Seminars, Webinars, and Computer Based). Our online store is filled with GD&T training and reference materials.

Recent GD&T Tips


February 2013 - Datum Shift

January 2013 - Using the Y14.8 Standard

December 2012 - Basic Dimension


Look for "Video Clip" to indicate that there is a clip of Don Day explaining that Tip. 


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Don't miss the new tips as they become available! 

Since 1997 Tec-Ease, Inc. has created a GD&T Tip-of-the-Month.  These tips are listed below in alphabetical order.  To view a tip, either scroll down the list and click on the GD&T topic or click a letter group, and be taken to those topics.  If you have a suggestion for an upcoming tip, please