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GD&T: A Common Language for Manufacturing


Machined components being reviewed against engineering drawings.

GD&T, or Geometric Dimensioning and Tolerancing, is a standardized symbolic language used on engineering drawings to define the allowable variation of a part's geometry. It is a critical tool for ensuring that parts are manufactured to the correct size, shape, orientation, and location.


What is GD&T?

GD&T is a system of symbols and notations that are used to define the allowable variation of a part's geometry. It is based on ASME Y14.5.


Why is GD&T important?

GD&T is important because it allows manufacturers to communicate the precise requirements of a part to suppliers and other stakeholders. It also helps to ensure that parts are manufactured to the correct tolerances, which can help to improve product quality and reduce costs.


How does GD&T work?

GD&T works by defining a series of features on a part. Each feature is assigned a tolerance, which is the allowable variation in the size, shape, orientation, or location of the feature.


What are the benefits of using GD&T?

There are many benefits to using GD&T, including:

  • Improved communication between designers, manufacturers, and inspectors

  • Reduced manufacturing costs

  • Improved product quality

  • Increased productivity


At VP Expert Machining, we understand the critical role GD&T plays in precision manufacturing. We leverage GD&T, along with other standards, to deliver you parts required for your specifications. Located in the Stoney Creek area of Hamilton Ontario, we not only service the Greater Toronto and Hamilton Area, we ship parts all across North America, including the United States, and Mexico.

© 2025 by VP Expert Machining Inc.

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