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What is GDT in Product Design? | Emergnt Design Labs

Updated on: June 3, 2022

If you’ve spent some time around mechanical engineering or manufacturing, then you might have heard of GD&T. But what is it? And why is it relevant to your product design project?

Geometric Dimensioning and Tolerancing (or GD&T) is a system for defining and communicating the tolerances of size, shape, orientation, and location for features on mechanical parts. It uses a set of symbols to convey this information clearly and concisely. GD&T is important because it helps ensure that manufactured parts meet the designer’s intent and are interchangeable with other parts. In other words, GD&T ensures that products are made to specifications.


There are three main benefits of using GD&T in product design:

  • improved communication between designers and manufacturers

  • increased accuracy of manufactured parts

  • reduced cost of rework due to errors.

Using GD&T can help you avoid costly mistakes in manufacturing, improve communication between designers and engineers.


On-Demand Product Development GD&T is effectively a language for designers and manufacturers to communicate about what is an acceptable part.

One common problem that can be avoided with GD&T is mismatches between parts. For example, if two parts are supposed to fit together but don’t, GD&T can help identify the mismatch and prevent the part from being manufactured. GD&T can also help reduce the cost of rework due to errors. By specifying the tolerances of size, shape, and location for features on a part, GD&T can help ensure that the part is manufactured accurately the first time. This can save time and money in the manufacturing process.


At Emergnt Design Labs, we use GD&T to ensure our clients’ success. We work closely with our clients to understand their needs and specifications, and then use GD&T to create detailed drawings that accurately communicate those requirements to our manufacturing partners. This ensures that our clients’ products are made to the highest standards and meet their exact specifications.

GD&T is an essential part of our design toolkit, and we know that- depending on the project needs, it’s crucial to ensuring the accuracy and interchangeability of manufactured parts. We are confident in our ability to use GD&T effectively, and we are committed to providing our clients with the best possible product design services.

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