Why Adopt GD&T at Your Company?

There are a number of reasons to adopt GD&T at your company:

Clarity and consistency in the design processGD&T provides a clear and concise method for defining a reference coordinate system on a component or assembly that can be used throughout manufacturing and inspection. This reduces misinterpretations, and the need for costly engineering changes and rework that can result from a lack of clarity.

Dramatic time savingsBy using GD&T, engineers dramatically reduce their need for drawing notes to describe complex geometry requirements on components and assemblies.

Fit with accepted design-for-manufacturing methodsThe proper application of GD&T closely dovetails accepted and logical mechanical design processes and design-for-manufacturing considerations. For example, the allowable variations as defined through GD&T can be directly read, or “imported,” into 3D tolerance analysis software such as 3DCS.

 What is GD&T? Click here to learn more. 


GD&T Courses Offered by DCS


This 2 - day course comprising a basic fundamental geometric dimensioning and tolerancing (GD&T). This course is an introduction of the geometric dimensioning and tolerancing (GD&T) aimed at developing the participants understanding of the symbols and standards.

This course is ideal for individuals who interpret engineering drawings including design, layout, assembly, checking and inspection personnel. Beginning designers, drafters, quality, procurement, tooling, production, manufacturing and shop personnel; designers, and others involved with tooling, production, and inspection.


  • Learn how to interpret engineering drawings produced in accordance with the ASME Y14.5 standard.
  • Discover the terms, rules, symbols, and concepts of GD&T as prescribed in the standard, as well as gain an in-depth understanding of the geometric symbols, including each symbol’s requirements, tolerance zones, and limitations.
  • Gain a thorough understanding of the fundamental concepts of GD&T ensuring participant have a solid foundation for understanding more advanced topics.

Program Outline, Covered Subject Matter:


  • Drawing Standards
  • Dimensions, Tolerances, and Notes Used on Drawings
  • Comparison between Coordinate Tolerancing and Geometric Dimensioning and Tolerancing
  • General Dimensioning Symbols


  • GD&T Concepts
  • Key GD&T Terms
  • Symbols and Modifiers
  • GD&T Rules


  • The Datum System
  • Datum Targets
  • Size Datum Features (RMB)
  • Size Datum Features (MMB)

Form Controls

  • Flatness Tolerances
  • Straightness Tolerances
  • Circularity Tolerances
  • Cylindricity Tolerances

Orientation Controls

  • Perpendicularity Tolerances
  • Angularity Tolerances
  • Parallelism Tolerances

Profile Controls

  • Profile Basic Concepts
  • Profile Tolerance Applications

Position Controls

  • Position Tolerance Introduction
  • Position Tolerance – RFS and MMC

Runout, Concentricity and Symmetry Controls

  • Circular and Total Runout Tolerances
  • Concentricity and Symmetry Tolerances




This 2 - Day course is focused on practical applications of GD&T for real world experience. This course focuses on the application and development of Geometric Dimensioning and Tolerancing in your application, on your drawings.

This course is ideal for professionals who use the ASME Y14.5 Dimensioning and Tolerancing standard, who work in design, drafting, quality, procurement, tooling, production, and manufacturing


  • Develop participants understanding of Datum Reference Frames
  • Develop participants knowledge of proper Datum Feature selection and specification
  • Enhance participants understanding each of the ASME Y14.5M controls and rules
  • Evolve participants ability to calculate functional tolerances for maximum cost effectiveness, a crucial skill in today’s competitive workplace.
  • Learn how to use tolerance stacks to establish part tolerances and analyze designs.

Program Outline, Covered Subject Matter:

Day 1

  • Dimensional Management Overview
  • Quick review of Basic GD&T
  • Datum
    • Datum Selection Based on Geometry Function and Process
  • Material Modifier
    • Applicability of Modifier
      • Screw Thread
      • Gears and Splines
  • Form Tolerances
    • Circularity
      • Circularity Applied to a Cone
      • Circularity Applied to a Sphere
  • Composite Profile
    • Composite Profile with a Rate of Change
    • Composite Profile with Full Datums

Day 2

  • Location Tolerances
    • Positional Tolerances
      • Least Material Condition (Bonus Tolerance, Tolerance Zone)
      • Controlling Coaxiality
      • Controlling Symmetry
      • Counter Bores
      • Two Single Segment
      • Without Projected Tolerance
      • With Projected Tolerance
  • Runout
    • Circular Runout
      • Circular Runout With Multiple Datum Features
      • Circular Runout Applied to a Shoulder
      • Circular and Total Runout
      • Circular Runout Applied to a Restrained Non-Rigid Part
  • Calculation of tolerances for maximum cost effectiveness
  • Functional gauge design
  • GD&T Standards Examples
    • Default Linear Tolerances
    • Defaults GD&T Tolerances and Datum Blocks
    • Pre-qualifying Datums
    • Preferred Fastener List and Defaults Hole Sizes
  • GD&T Drawings Review
  • Tolerances Stack Studies Calculation for GD&T Validation

Classes are available on demand at customer location or at DCS's Headquarters in Troy, Michigan, USA.

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