Fundamentals of Geometric Dimensioning & Tolerancing (GD&T) Web Seminar RePlay PD330933ON

Topics: Quality, Safety & Maintenance Design Engineering and Styling


Geometric dimensioning and tolerancing (GD&T) is used as a symbolic way of showing specific tolerances on drawings. GD&T is a valuable tool that effectively communicates the design intent to manufacturing and inspection. It is governed by the technical standard ASME Y14.5-2018 (recently revised from the 2009 edition). This course introduces participants to the GD&T system, providing a working knowledge of the correct interpretation and application of each symbol, general rules, the datum system, and 'bonus' tolerance and highlighting some of the changes in the updated Y14.5 standard - - most notably, the deletion of concentricity and symmetry. The material is reinforced with many practice exercises.


By participating in this course, you'll be able to:

  • Explain the benefits of geometric tolerancing
  • Identify datum features and determine their order of precedence
  • Identify and interpret each of the characteristic symbols
  • Describe the material condition modifiers and how "bonus" tolerance occurs
  • Correctly interpret GD&T feature control frames, and explain the impact on manufacturing and inspection

Materials Provided

  • 90 days of online single-user access (from date of purchase)
  • 16 hours of instructor-delivered content
  • Course workbook (downloadable, .pdf's)
  • Online learning assessment
  • Instructor follow up to your content questions
  • 1.6 CEUs* (upon completion of all course modules and satisfactory assessment score)

*SAE International is authorized by IACET to offer CEUs for this course.

Is this Web Seminar RePlay for You?

This course is ideal for anyone who has a need to apply or interpret geometric tolerances on a product print. Product engineers, manufacturing engineers, CAD designers, quality inspectors, and other engineering and manufacturing personnel will all benefit from a better understanding of design requirements; improved communication with customers and suppliers; and improving designs by taking advantage of bonus tolerance and other GD&T benefits. Participants should have an understanding of basic blueprint reading.

This course satisfies a requirement in the Product Engineering Tools and Methods Certificate Program.

Have colleagues who need this course? See Special Offers to the right.

Click on the Requirements tab to make sure you are properly equipped to interact with this course.


"This course gave a great overview of GD&T principles, and pointed me in the right direction for further training."
Jay Johnson
Motorsports Design Engineer
Goodridge USA


"Great course for anyone that has been exposed to GD&T for a few years and wants to gain a great fundamental knowledge of the topic!"
Dennis Smith
Mechanical Engineer

For More Details

Email, or call 1-877-606-7323 (U.S. and Canada) or 724-776-4970 (outside US and Canada).

Session 1
  • Why Use GD&T?
    • Review of traditional dimensioning
    • Benefits of GD&T
    • Technical standards
    • Definitions
    • Basic dimensions
    • How to read the feature control frame
    • Rule #1: Size controls form
Session 2
  • Rules and the Form Symbols
    • Rule #2: Assume RFS
    • Flatness
    • Surface straightness
    • Circularity
    • Cylindricity
    • GD&T applied to a feature of size
    • MMC modifier and "bonus tolerance"
    • Virtual condition
Session 3
  • Datums
    • Datum vs. datum feature
    • Proper ways to label the datum feature
    • The datum reference frame
    • Primary, secondary, and tertiary datums
    • Datums modified with "M" (MMB)
    • Datum targets
Session 4
  • Position Tolerance 
    • Definition of "true position"
    • Simple example of position on hole/pin
    • Using the MMC or LMC modifiers
    • The "boundary" concept
    • Position on screw threads; pitch diameter rule
    • Projected tolerance zone
    • Composite position tolerancing on a pattern
Session 5
  • Profile and Orientation
    • General definition of profile
    • Profile of a line
    • Profile of a surface
    • Use of datums with profile
    • Perpendicularity
    • Angularity
    • Parallelism
Session 6
  • Symmetry and Coaxial Controls
    • Concentricity (and why it's been deleted in Y14.5)
    • Symmetry (and why it's been deleted in Y14.5)
    • Circular runout
    • Total runout
  • Application of GD&T to a real-world part
  • Inspection and gaging of GD&T callouts
  • Wrap-up

  • Windows or macOS
  • Microsoft Edge, Mozilla Firefox, Google Chrome, Safari (Other OSs and browsers including mobile devices are not supported by may work)
  • Broadband-3Mbps minimum

John-Paul A. Belanger
John-Paul A. Belanger

John-Paul Belanger is president of Geometric Learning Systems, a consulting firm specializing in geometric dimensioning and tolerancing (GD&T). For over twenty years, he has trained people throughout North America and Europe in the proper interpretation and application of GD&T per the Y14.5 standard by using practical examples. Mr. Belanger is certified by the American Society of Mechanical Engineers as a Senior GD&T Professional, and has worked with a wide range of companies in the automotive, aerospace, electronic, and other industries to apply tolerances and perform stack calculations. He holds a B.S. in aerospace engineering from the University of Michigan specializing in aircraft design and safety.

Access Period: 90 Days      CEUs: 1.6

Duration: 16 Hours
Members save up to 9% off list price.
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Special Offers: To cost effectively train multiple team members, contact Corporate Learning Solutions for discount pricing. Email, call 724-772-8529, or complete a Corporate Learning Solutions Request Form.