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Drawing Interpretation

Understand basic mechanical two-dimensional engineering drawings, drawing elements, part and section views, dimensions, tolerances, finish and welding symbols.

This Standard was last reviewed and reaffirmed in {{activeProduct.ReaffirmationYear}}. Therefore this version remains in effect.

Drawing Interpretation
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Get 5 seats in any Self Study course, Guided Study course, or Learning Path for 25% off.

Use discount code 5FOR25 at checkout.


Learn more about our ASME Y14.5 Geometric Dimensioning and Tolerancing (GD&T) Fundamentals Learning Path.

This Self Study course is available on ASME’s Learning Hub, our online learning platform, and is designed to be taken at your convenience, and on your own schedule. You have 90 days to complete the course from the date of purchase.

This course covers the majority of information required to understand basic mechanical two-dimensional engineering drawings.  Topics covered are:

  • Basic drawing elements (formats, title block, parts list, revision block, etc.)
  • Part views (multiview, auxiliary, and isometric)
  • Section views
  • General dimensions
  • Tolerances
  • Finish and welding symbols.

The course consists of nine modules, each with a quiz; most also include drawing assignments and supplementary information.  As reference material, a drawing packet is included that shows five detail drawings and an assembly drawing for the parts of a Trolley Wheel. The package includes flat and round parts and a casting.  Possession of the ASME Y14.5 Dimensioning and Tolerancing Standard is recommended.

This is an online, self study course, allowing you to work at your own pace and convenience.

You Will Learn To

  • Describe the fundamentals of drawing interpretation
  • Identify drawing elements, including part views and sections
  • Describe general dimensions and tolerances
  • Explain how to present surface texture, fasteners and welding

Who Should Attend
Beginning designers, drafters, quality, procurement, tooling, production, manufacturing and shop personnel; more advanced designers, and those involved with tooling, production, inspection, routing in the shop; others involved with purchasing, costing and management; vendors and suppliers.

To take this course you should have a personal computer, Web browser, Internet connection, and software to display PDF files (such as Adobe Reader).


Module 1

  • Drawing Interpretation Introduction
    • Draw production
    • Standards
    • Design
    • Inspection

Module 2

  • Drawing Layout
    • Parts of two-dimensional drawings
    • Sizes and codes

Module 3

  • Part Views
    • View projection
    • Projection systems
    • Surface types
    • Line types
    • Multiview drawing visualization
    • Exercises

Module 4

  • Auxiliary Views
    • Define and recognize auxiliary views
    • Successive auxiliary views
    • Partial Views
    • Secondary auxiliary view
    • Exercise

Module 5

  • Isometric and Oblique Views
    • Pictorial Views
      • ASME Y14.4 Pictorial Drawings standard/ ASME Y14.41 Digital Product Definition Data Practices standard
    • Axonometric Projection
    • Oblique Projection
    • Exercises

Module 6

  • Section Views
    • Section line patterns
    • Section types
    • Exercises
    • Quiz

Module 7

  • General Dimensioning
    • ASME Y14.5-2009 Dimensioning and Tolerancing standard
    • Feature types
    • Dimension elements
    • Dimension construction
    • General dimensions
    • Exercises
    • Quiz

Module 8

  • Tolerances
    • Size Features
    • Dimension Expression
    • Terminology
    • Envelope Principle
    • Dimensioning Rules
    • Tolerance Allocation
    • Exercises
    • Quiz

Module 9

  • Surface Texture
    • Surface Texture Symbols and Characteristics
    • Proper placement of surface characteristics on a surface texture symbol
    • Exercises
    • Quiz

Module 10

  • Fasteners
    • Thread Characteristics
    • Thread Notes
    • Thread Drawing Appearance
    • Pipe Threads
    • Thread Uses
    • Washers
    • Nuts
    • Other Threaded Fastener Factors
    • Keys
    • Splines, Gears and Serrations
    • Pins
    • Retaining rings
    • Springs
    • Cams
    • Exercises
    • Quiz

Module 11

  • Welding
    • Common weld joints
    • Common weld type symbols
    • Parts of the weld symbol
    • Quiz
  • Final Exam
Course Developer

Patrick J. McCuistion, Ph.D., GDTPS, created all the figures for the Y14.43 standard. He was an Associate Professor in the Engineering Technology and Management Department at Ohio University for 25 years. He taught Geometric Dimensioning and Tolerancing, Dimensional Analysis, Quality Management Systems, Microsoft Office Suite, and Technical Writing. Prior to that, he taught three years at Texas A&M University and one year at Pittsburg State University.

Dr. McCuistion worked for eight years in various engineering design, drafting, and design and drafting checking positions. He has provided instruction in geometric dimensioning, dimensional analysis, and dimensional metrology to industry, military, and educational institutions since 1986. He has authored one book on geometric dimensioning, three ASME Instructor-supported online courses on Drawing Interpretation, Basic Geometric Dimensioning and Advanced Geometric Dimensioning, and two ASME self-study internet courses covering Drawing Formats, Line Conventions and Lettering, Orthographic and Pictorial Views, Dimensioning and Tolerancing, and Drawing Revisions.

Dr. McCuistion is active in the following ASME/ANSI codes and standards committees: Y14 Main, Y14.2 Line Conventions and Lettering, Y14.3 Orthographic and Pictorial Views, Y14.5 Dimensioning and Tolerancing, Y14.5.2 Certification of Geometric Dimensioning and Tolerancing Professionals, Y14.8 Castings, Forgings, and Molded Parts, Y14.35 Revision of Engineering Drawings and Associated Documents, Y14.36 Surface Texture Symbols, Y14.43 Dimensioning and Tolerancing Principles for Gages and Fixtures, and Y14/B89 Joint Committee on the Specification of Notation to Support Requirements for Size and Geometric Tolerances.


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