What is GD&T?

GD&T (Geometric Dimensioning and Tolerancing) is a particular way of communicating dimensions and tolerances for size, location, orientation, and form. In North America, the current standard is ASME Y14.5-2009, which is very similar to ISO, DIN, JIS, and other standards used outside of the US. The basic idea of GD&T:

Geometric: A way of thinking about and communicating dimensions and tolerances for a product.

Dimensioning: Calculating, recording, and communicating desired values for size, location, orientation, and form.

Tolerancing: Calculating, recording, and communicating acceptable ranges for size, location, orientation, and form.

GD&T is sort of a "self-contained" language for communicating desired and acceptable product geometries, defined by ASME (the American Society of Mechanical Engineers) in ASME Y14.5-2009. Previous editions include ASME Y14.5M-1994 and ANSI Y14.5M-1982. (Even though the standard has changed over the years from "ANSI" to "ASME" it is still considered an ANSI standard.) We offer training on the ANSI/ASME standard, but also discuss differences between the ASME and ISO standards.

To get started with GD&T, download a free reference guide to see the symbols used to control features, or enroll in our "Introduction to GD&T" course for only $49.

Who are we?

www.gd-t.com is home to ASME Senior Level GDTP providers of Geometric Dimensioning & Tolerancing (GD&T) ASME Y14.5M-1994 training programs, including Tolerance Stack Analysis Using GD&T.

We offer on-site training, public seminars, and online training. Please This e-mail address is being protected from spambots. You need JavaScript enabled to view it with any questions.

It's easy to cut costs for training, but how do you account for the costs associated with engineering errors, manufacturing mistakes, or inspection inaccuracies? Call to ask how we can save you money NOW - we also offer consulting, on-site (or via the web) drawing reviews and GD&T checks, and we can schedule custom training on-site (or via the web) at your convenience.

We offer a 3-day Fundamentals of GD&T ($1095) course and a 2-day Tolerance Stack Analysis Using GD&T ($895) class. A 1/2-day GD&T Overview ($250) class is also available, and is actually the first 4-hours of the 3-day Fundamentals of GD&T class - the same course manual is included (a $70 value), and now all attendees will also receive copies of ASME Y14.5-2009 (a $170 value).  You can see all of the current seminar offerings by clicking on Scheduled Events on the top menu.

If your organization has five or more individuals who need training in GD&T or tolerance stack analysis, please contact us - we'd love to bring the training to you. We have run public seminars in Detroit, Dallas-Ft. Worth, Los Angeles, and Boston in recent years, and we are planning on holding classes in Boston, Detroit, Phoenix, and Houston in 2010.

Our GD&T instructors are dedicated to helping you learn job related skills in a challenging yet fun environment. All of our instructors are certified by ASME as GDTP (Geometric Dimensioning & Tolerancing Professional) in accordance with the qualifications of ASME Y14.5.2 in the Senior Level.

We have three online courses ready for enrollment:

GDT099: Introduction to GD&T. ($49)

TOL301: Tolerance Stack Analysis Using GD&T ($260)

GDT201: Fundamentals of GD&T ($325)

Click on Online GD&T Training on the side menu to see course descriptions or to enroll. The courses are all available in a self-study format, and you can enroll any time with a credit card. Call us at (586) 693-0219 if you have any problems or questions. Thanks!

John Stolter

President, Stolter, LLC