GD&T Rule #1: Envelope Principle

GD&T Rule #1, also known as the Envelope principle, states that the form of a regular feature of size is controlled by its “limits of size." Limits of size, or otherwise known as size tolerances, can be seen in many forms. A few of them are symmetric, unilateral, and bilateral.

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Envelope Requirement, GD&T Techniques, GD&T Fundamentals