True-position dimensioning defines the exact location on a component of features such as holes, slots, keyways, etc., and also differentiates between 'ideal' and other toleranced dimensions. True-position dimensions are always shown 'boxed' on engineering drawings; they are never individually toleranced, and must always be accompanied by a positional or zone tolerance for the feature to which they are applied.
The positional tolerance is the permitted deviation of a feature from a true position.
The positional-tolerance zone defines the region which contains the extreme limits of position and can be, for example, rectangular, circular, cylindrical, etc.
zone 0 0.05
Fig. 23.2 Product requirement zone 0 0.05
Fig. 23.2 Product requirement
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