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GD&T Concepts

Feature
Axis
Feature-of-Size (FOS)
Maximum Material Condition (MMC)
Bonus Tolerance
Tolerance Stack
Datum
Full Indicator Movement
Datum Target
Control
Median Points

When using GD&T tolerances, there are additional concepts that are required to clarify the use of GD&T symbols. These pages explain some of the major items required to read and interpret GD&T callouts.

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