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

Course code: PD330933ON

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
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Starting date: Upon request

Type: TOD

Course duration: 90 days

Language: en

Price without VAT: 1 005 EUR


Type Course
Language Price without VAT
Upon request TOD 90 days en 1 005 EUR Register
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Course structure

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
  • 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.


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.

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