GD&T Basics

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GD&T Basics At GD&T Basics we break down the complex world of GD&T and focus only on exactly what you need for success in engineering or machining.

10/23/2026

When Y14.5 hits different...

How is Total Runout different from Circular Runout?Both control surface variation on rotating parts, but Total Runout ta...
10/21/2026

How is Total Runout different from Circular Runout?
Both control surface variation on rotating parts, but Total Runout takes it a step further by controlling the entire surface—not just individual cross sections.
What does the Total Runout tolerance zone look like? How is it inspected? And how does it's control compare to other symbols?
Take a look at the enhanced Total Runout symbol page to learn more!
👉 https://hubs.la/Q04zV8cf0

10/16/2026

The machinist love language...

If a part rotates, it probably requires Runout.Radial deviations on a circular part can lead to unwanted wobble or vibra...
10/14/2026

If a part rotates, it probably requires Runout.
Radial deviations on a circular part can lead to unwanted wobble or vibration, especially at high speeds. Runout controls that deviation relative to a datum axis.
Learn how Runout works, how it’s inspected, and when to use it in our freshly updated GD&T Symbols page, now with more examples and improved visuals:
👉 https://hubs.la/Q04zhSvp0

10/09/2026

Training costs money. So do bad parts, scrap, rework, and time spent arguing over drawings. 😅

Here's a look at the true costs of training versus potential savings that GD&T knowledge can bring your company:
https://hubs.la/Q04xGJNw0

What’s the difference between Circularity and Cylindricity?Both are form controls, but while Circularity controls indivi...
10/07/2026

What’s the difference between Circularity and Cylindricity?

Both are form controls, but while Circularity controls individual cross sections of a feature, Cylindricity is a 3D tolerance that controls the overall form of a cylindrical feature.

What does the Cylindricity tolerance zone look like? How is it inspected? And when would you use Cylindricity instead of Circularity?

Jason has been working behind the scenes, refreshing our GD&T Symbols pages to add even more helpful content. Learn all about cylindricity here:
https://hubs.la/Q04xGFr80

No CAD model, no chill
10/02/2026

No CAD model, no chill

Have you visited our GD&T Symbols pages lately?Jason has been working behind the scenes to make these resources even mor...
09/30/2026

Have you visited our GD&T Symbols pages lately?

Jason has been working behind the scenes to make these resources even more helpful by adding more examples, improving visuals, and linking related content.

This week’s featured symbol: Circularity
The circularity symbol is used to describe how close any given cross section of a feature should be to a true circle. So, how is it actually applied on an engineering drawing? What does the tolerance zone look like? How is it inspected?

Check out our refreshed Circularity page to learn more, see examples, and better understand how this symbol is used.
👉 https://hubs.la/Q04xzMC00

Some GD&T callouts just hit different in the shop. 😂 Which one gets the biggest reaction from your machinists?
09/25/2026

Some GD&T callouts just hit different in the shop. 😂 Which one gets the biggest reaction from your machinists?

Thinking about getting ASME GD&T certified? With the new 2018 GDTP exams now available, you may be wondering which exam ...
09/23/2026

Thinking about getting ASME GD&T certified? With the new 2018 GDTP exams now available, you may be wondering which exam is right for you.

We’ve updated our ASME GD&T Exam Certification Guide to help you navigate your options and understand what’s changed.

In the updated guide, we cover:
• The differences between the 2009 and 2018 exams
• The Technologist and Senior certification levels
• How to determine which exam best fits your experience and goals

Not sure which exam to take? Start here.
https://hubs.la/Q04x8NNT0

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