The Geometrical Tolerancing Desk Reference: Creating and Interpreting ISO Standard Technical Drawings
By Paul Green

Chapter 11: Projected Tolerance Zone

Projected tolerance zone symbol

In the case of a tolerance of orientation (angularity) and position, the tolerance can also apply to the external projection of it and NOT to the tolerance itself, hence this is a projected tolerance zone.

Example 1: Explanation of a projected tolerance zone
Example 2: No projected tolerance zone
Example 3: With a projected tolerance zone
Copyright Paul Green 2005 under license agreement with Books24x7
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