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GPS 110 - Dimensional Tolerancing

The basic rules for dimensional tolerancing within GPS.

In this course you will learn how to use dimensional tolerancing in technical drawing according to the ISO GPS rules. You will learn the feature concept and what a feature of size is. As it turns out, these are the only kind of features that you should tolerance with dimensional tolerances. This course will explain why.

You will learn how to indicate dimensions and tolerances in drawings and how to tolerance using IT (International Tolerance) codes, e.g. H7 or c6, as defined in ISO 286.

You will also learn to use envelope requirements to ensure simple assemblability between shafts and holes.

Finally, you will learn about former practice and the rules that applied before the most recent standards for size tolerancing were published in 2010. This is valuable, if you have to read and interpret or update older drawings.

Course Topics:

  • How dimensions are indicated in technical drawings
  • The different types of dimension indications
  • What should and what should not be toleranced with dimensional tolerances
  • IT tolerance codes according to ISO 286
  • The envelope requirement
  • Former rules for dimensional tolerancing


Your Instructor


Henrik S. Nielsen
Henrik S. Nielsen

Dr. Henrik S. Nielsen is the president of HN Metrology Consulting and HN Proficiency Testing, the first accredited proficiency testing provider catering to dimensional inspection and calibration laboratories in the US.

His areas of expertise include geometrical product specifications, dimensional metrology, uncertainty estimation and quality assurance for calibration laboratories. He teaches seminars on all of these subjects though various organizations.

Dr. Nielsen is the chairman of ISO Technical Committee 213 “Geometrical Product Specifications and Verification” and has been an expert serving on related committees since 1988. He has served as project leader and author of several ISO standards.

Prior to founding HN Metrology Consulting in 1998, Dr. Nielsen was the Technical Manager of Corporate Standards at Cummins Engine Co. in Columbus, Indiana. Dr. Nielsen holds a M. Sc. In Mechanical Engineering and a Ph. D. in Metrology, both from the Technical University of Denmark.


Frequently Asked Questions


When does the course start and finish?
The course starts now and never ends! It is a completely self-paced online course - you decide when you start and when you finish.
How long do I have access to the course?
How does lifetime access sound? After enrolling, you have unlimited access to this course for as long as you like - across any and all devices you own.
What if I am unhappy with the course?
We would never want you to be unhappy! If you are unsatisfied with your purchase, contact us in the first 30 days and we will give you a full refund.

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