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What is GD&T?

GD&T stands for Geometric Dimensioning and Tolerancing, as defined by ASME Y14.5M-1994. 

GD&T: An International Language
Geometric dimensioning and tolerancing is an international language used on drawings to accurately describe a part. The language consists of a well-defined set of symbols, rules, definitions, and conventions that can be used to describe the size, form, orientation, and location tolerances of part features. 

GD&T: An Exact Language
Geometric tolerancing is an exact language that enables designers to “say what they mean” on a drawing, thus improving product designs. Production uses the language to interpret the design intent, and inspection looks to the language to determine set up. 

GD&T Provides Uniformity
By providing uniformity in drawing specifications and interpretation, GD&T reduces controversy, guesswork, and assumptions throughout the manufacturing and inspection process.

Effective Training Knows GD&T
ETI’s materials were developed by GD&T expert Alex Krulikowski, a recognized expert in the field of Geometric Dimensioning and Tolerancing. Alex deals with the tolerancing issues of “real world” GD&T on a daily basis, and he is a member of several national and international standards committees

With a degree in industrial vocational education and over 30 years of industry experience, Alex understands GD&T and utilizes the best teaching methods. He has written books, workbooks and software with his proven method for GD&T training, using a set of goals and objectives that keeps the training focused on the material that is most important. Many large corporations and hundreds of colleges have adopted our GD&T training materials as the best in the field.

ETI also uses outstanding GD&T instructors. All of our trainers have: 

1. Expert knowledge of the Y14.5 standard 
2. Current or recent industrial experience using GD&T 
3. At least ten years of experience using GD&T 
4. Experience and skill using ETI teaching materials 

Read more about our instructors.

Click each link to learn course details
ET2011 Advanced Concepts of GD&T 1994 3-Day
ET2512 Applications of GD&T 1994 & 2009 2-Day
ET8000 ASME Y14.5 1994-2009 Comparison 1-Day
ET2025 ASME to ISO Standards Comparison 1-Day
ET2421 Critical Concepts of Tolerance Stacks 1994 2-Day
ET1701 Critical Concepts of Tolerance Stacks 2009 2-Day
ET2701 Engineering Drawing Requirements 1-Day - Exclusively from ETI!
ET8200 Functional Gaging and Measurement 2-Day
ET2001 Fundamentals of GD&T 1994 3-Day
ET1151 Fundamentals of GD&T 2009 3-Day
ET2053 Fundamentals of GD&T for Inspectors 2-Day
ET2726 GD&T for Manufacturing 1-Day - Exclusively from ETI!
ET2055 Intro to Statistical Tolerance Stacks 1-Day- Exclusively from ETI!
ET7100 ISO Geometrical Tolerancing 3-Day
ET2501 Solid Model Tolerancing 1-Day - Exclusively from ETI!

Click on any link to learn more about our products and services
Software Web-Based Training Textbooks
Workbooks Reference Books & Materials Free Resources


Do you know how to use stacks to determine part distances or assembly conditions? Do you understand design analysis using geometric tolerances in stacks?

Take our Stacks Skills Survey today.

How well do you know GD&T? Do you know the symbols, requirements, tolerance zones, and limitations?

Take the GD&T Skills Survey today.

Geometric dimensioning and tolerancing can give your company the edge over the competition in today's cost competitive marketplace, and Effective Training can provide the training and materials you need to reap those benefits. If you’d like to discuss how geometric tolerancing will benefit your company, call 1-800-886-0909 or email today.


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This file last modified 08/19/16