The distance between the two planes is the tolerance limit for the callout. In the case of surface parallelism, the parallelism tolerance zone is made of two theoretically exact parallel planes. With both types of GD&T parallelism, the goal is to maintain parallelism (0° alignment) with the datum element (axis or plane) according to the limits specified in the feature control frame. The use of surface parallelism is more common than axis parallelism. It may either refer to surface parallelism or axis parallelism depending on whether you use it to control a surface or an axis. There are two types of parallelism in GD&T. You can use it to control centerlines, center planes, cylindrical and planar surfaces parallel to the datum elements. Parallelism is a 3D GD&T orientation tolerance which maintains that two part features are parallel to each other. VI Important Points to Remember What Is Parallelism in GD&T?
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