Fundamentals of GD&T 1994 2-day
I.D. # ET2401 Duration 2 Days
Providing you have a basic understanding of mechanical drawings, this course teaches the terms, rules, symbols, and concepts of GD&T as prescribed in the ASME Y14.5M-1994 Standard.

Utilizing the expertise of world-renowned GD&T expert Alex Krulikowski, the course offers an in-depth explanation of geometric symbols, including each symbol's requirements, tolerance zones, and limitations. It also includes a comparison of GD&T to coordinate tolerancing; an explanation of tolerance zones; Rules #1 and #2; form and orientation controls; tolerance of position; runout and profile controls. Newly acquired learning is reinforced throughout the class with more than 300 practice problems.

Each attendee receives a robust collection of learning resources including:

  • The Fundamentals of GD&T (ASME Y14.5M-1994) textbook, by Alex Krulikowski
  • A GD&T Ultimate Pocket Guide ('94)
  • A Fundamentals of GD&T Exercise Workbook ('94)
  • 30-day access to the Fundamentals of GD&T '94 web training course ($209 value) to practice and reinforce what was learned in the classroom

Tens of thousands of students have learned GD&T through Alex Krulikowski┐s textbooks, self-study courses, computer based training, and online learning center. Students who attend courses like this one walk away with more than knowledge. They gain on-the-job skills because the learning materials are performance-based.
Learning Objectives
By attending this class, you will be able to:

  • Describe what dimensioning and tolerancing is
  • Describe the key terms used in geometric tolerancing
  • Recognize the modifiers and symbols used in GD&T
  • Explain the rules used in GD&T
  • Describe the concepts of basic dimensions, worst-case boundary, virtual condition, inner and outer boundary, and bonus tolerance
  • Interpret the various types of tolerances (flatness, straightness, circularity, cylindricity, perpendicularity, angularity, parallelism, position, runout, and profile)
  • Describe the datum system
  • Interpret applications of datum targets, feature of size datum specifications (RFS & MMC)
  • Calculate tolerance of position tolerance values using the fixed and floating fastener formulas

Who Should Attend
This course is valuable for individuals who create or interpret engineering drawings, product and gage designers; process, product, and manufacturing engineers; supplier quality engineers/professionals; CMM operators; buyers/purchasers; checkers; inspectors; technicians; and sales engineers/professionals.
Student should have completed ETI's Engineering Drawing Requirements course or equivalent.
Seminar Content

  • Engineering drawings
  • GD&T/coordinate dimensioning comparison
  • Eight key GD&T terms


  • GD&T modifiers and symbols
  • Rule #1 and Rule #2
  • Basic dimensions, virtual condition, bonus tolerance

Form Controls

  • Flatness
  • Straightness
  • Circularity
  • Cylindricity


  • The datum system (planar datums)
  • Interpreting datum targets
  • Feature of size datum specifications (RFS)
  • Feature of size datum specifications (MMC)

Orientation Controls

  • Perpendicularity
  • Angularity
  • Parallelism

Tolerance of Position Controls

  • Definitions, conventions, advantages, basic theories
  • RFS and MMC tolerance of position applications
  • Cartoon gages for tolerance of position (MMC) applications
  • Tolerance of position special applications
  • Calculating distances on parts dimensioned with tolerance of position
  • Fixed and floating fastener formulas

Concentricity / Symmetry Controls

  • Concentricity
  • Symmetry

Runout Controls

  • Circular runout
  • Total runout

Profile Controls

  • Profile tolerancing
  • Profile of a surface
  • Profile of a line

Final learning assessment; closing comments

All of ETI's instructors are industry professionals with years of experience applying GD&T on the job. ETI trainers have:

  • Expert knowledge of the Y14.5 Standard
  • Current or recent industrial experience using GD&T
  • At least five years
Fees: $1280 SAE Members*: $1024 - $1152
* The appropriate SAE Member discount will be applied through the Registration process.  Discounts vary  according to level of membership: Elite Member 20%; Premium Member 15%; Classic Member 10%
CEU 1.3