May 11, 2017

The purpose of this blog is to share information on ASME GD&T and ISO GPS standards. It will also discuss real-life tolerancing issues and dimensional engineering applications, practical solutions related to the topics of engineering drawing standards, GD&T usage, inspection, gaging and measurement design analysis, and tolerance stack-ups.. This blog will become your go-to source for information on standards and all things about GD&T.

The blog will contain a variety of informative / interactive features such as: discussions, surveys, quizzes, teaching methods, tips, notices of standards meetings and publication of new standards. 

About the author 

Alex Krulikowski

‚ÄčAuthor of 22 books on GD&T, teacher, mentor, instructional designer, ASME and ISO standards member, product designer, dimensional engineering manager, speaker, and successful entrepreneur.

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  1. I don’t know if this is the place for this but where can I find a hard to find thread dimension? I’m referring to a 7 7/8-16 N.S Class 4 fit?

    1. Chris,

      I did a bit of checking in the thread standards I have at hand and was not able to find an answer to your question. You are correct; this is a hard to find thread specification. Another source that may be able to help you is to post your question on my GD&T / Dimensional Engineering group on Linkedin. The URL is
      If I find an answer, I will post it on that site.

    2. I have engaged in Standards decades ago. And even developed a spreadsheet to produce thread specifications with gage specifications as well. It is a long time in my history, however, I know you can find this thread specification from industry standards.

  2. Dear Alex,

    Hope we will get more gems of wisdom in GD&T from this new blog.

    You have already made a huge contribution to mechanical industry, but still going strong.

    Appreciated your passion and commitment at this age. So active.

    Best wishes,

    Swapnil Gujarathi
    Senior GD&T trainer (GDTP-S)
    Nashik, India

    1. Swapnil,

      Thanks for the kind words. Stay tuned! Lots of GD&T related stuff coming in this blog.

  3. Dear Alex,

    Hope we will get more gems of wisdom of GD&T from this new blog.

    You have already made a huge contribution to mechanical industry, and you are still going strong.

    Appreciated your passion and commitment to GD&T at this age. You are so very active.

    Swapnil Gujarathi
    Senior GD&T trainer (GDTP-S)
    Nashik – India

  4. Greetings Alex,

    I hope the GD&T Blog is a hit.

    To help get you started…I’d like to discuss how we should handle independence of size and form controls…as one of the first topics. If an OEM has a directed supplier @ the tier 2 level…and we’re the tier 1…

    Industry practice is to put a size control on the cylindrical feature…yet the OEMs…all of them it seems…require measurement plans that omits checking certain types of form error.


  5. Mike from Siemens Newark De.
    Hello Mr. Krulikowski
    I look forward to following your blog. It is timely as we are about to kick off a new project. Will be working with a design house in Bangalore India. The company is HCL and they deffinetly need help with understanding the application of GD&T.

    1. Hi Gordon

      You sign up using the “Sign up for blog alerts” box on the upper right of this page.

  6. You should find a way for users to assign standard legend keyword to a blog to add to what will become a 10,000 blog post archive. This way another user can select only CONGRATULATIONS posts and/or PROFILE blog posts that the user is interested really interested in reading.

    For example, The Tec-Ease GDT tips page has all tips cross referenced in a standard legend. Pick POSITION from the legend and only 25 related tips from the entire directory appear, not 10,000.

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