Fundamentals of GD&T ASME Y14.5M 1994 - Advanced Level

This 3-day advanced-level Fundamentals of GD&T course is an in-depth study of the terms, rules, symbols, and concepts of geometric dimensioning and tolerancing as prescribed in the ASME Y14.5M-1994 Standard. The course can be conducted in three 8-hour sessions or with flexible scheduling including five mornings or five afternoons. 

This class includes all the content from the Fundamentals of GD&T 2-day foundational course: an explanation of geometric symbols, including each symbol’s requirements, tolerance zones, and limitations. It compares GD&T to coordinate tolerancing, and explains 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 100 practice problems using industrial drawings.

This in-depth, advance-level course also covers
  • More detailed discussion of terms, concepts, and symbols used in GD&T
  • Using tolerances on CAD models
  • Discussions of verification principles for each geometric tolerance
  • Related and unrelated actual mating envelope
  • Functional and cartoon gages
  • Examples of inspection methods for each geometric tolerance
  • Critical thinking discussion
  • 50 additional practice problems using industrial drawings

Newly acquired learning is reinforced throughout the class with more than 150 practice exercises. 

Each attendee receives:
  • The Fundamentals of GD&T (ASME Y14.5M-1994) textbook by Alex Krulikowski
  • GD&T Ultimate Pocket Guide (1994)
  • A GD&T Workbook with Engineering Drawings (1994)

This course provides a complete look at GD&T Fundamentals. For more complex GD&T topics, like the expanded use of composite position and profile tolerances, customized datum reference frames, the translation modifier, and applying GD&T to non-rigid parts, see our Advanced Concepts of GD&T course.

What Will You Learn

By attending this class, you will be able to:
  • Describe engineering drawings: importance, drawing conventions, dimensions and tolerances, standards*
  • Describe what dimensioning and tolerancing is
  • Explain why geometric tolerancing is superior to coordinate tolerancing*
  • 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, concentricity*, symmetry*, runout, and profile)
  • Describe the datum system
  • Interpret applications of datum targets, feature of size datum specifications (RFS & MMC)
  • Describe the fundamental concepts of tolerance of position
  • Interpret tolerance of position special applications*
  • Calculate tolerance of position tolerance values using the fixed and floating fastener formulas*

*Not covered in 2-day foundational-level course

This course teaches GD&T fundamentals. For more advanced GD&T concepts (composite tolerancing, tolerance analysis, datum selection, non-rigid part dimensioning) see our Advanced Concepts of GD&T course offering. 

Is This Course For You

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.

Materials Provided

This data is not available at this time

Course Requirements

This data is not available at this time


  • 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*
  Runout Controls
  • Circular runout
  • Total runout
Profile Controls
  • Profile tolerancing
  • Profile of a surface
  • Profile of a line
  • Profile tolerance applications*
*Not covered in 2-day foundational-level course