Fig Projected Tolerance Zone Applied For Studs Or Dowel Pins

One feature control frame is placed under the callout specifying hole requirements and the other under the callout specifying counterbore requirements. See Fig. 5-38. Different diameter tolerance zones for hole and counterbore are coaxially located at true position relative to the specified datums.

(c) Where positional tolerances are used to locate holes and to control individual counterbore-to-hole relationships (relative to different datum features), two feature control frames are used as in (b) above. In addition, a note is placed under the datum feature symbol for the hole and under the feature control frame for the counterbore, indicating the number of places each applies on an individual basis. See Fig. 5-39.

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