Category: Profile

Unilateral Tolerance and Bilateral Tolerance

by Seth Elder on October 12, 2020.

In this article, we explain the differences between bilateral, unilateral, and unequally disposed tolerances. What is a Tolerance? Tolerances on technical drawings communicate the amount of variation permitted from a target dimension.  The allowable variation...

Profile of a Surface

by GD&T Basics on December 18, 2014.

Defines a 3D tolerance zone around any surface shape. One of the most powerful controls in GD&T for complex or freeform geometry.

Profile of a Line

by GD&T Basics on December 2, 2014.

Defines a 2D tolerance zone along any curved line or cross-section. Think of it as profile of a surface, but applied one slice at a time.