Counterbored Holes

Where positional tolerances are used to locate coaxial features, such as counterbored holes, the following practices apply.

(a) Where the same positional tolerance is used to locate both holes and counterbores, a single feature control frame is placed under the callouts specifying hole and counterbore requirements. See Fig. 5-37. Identical diameter tolerance zones for hole and counterbore are coaxially located at true position relative to the specified datums.

(b) Where different positional tolerances are used to locate holes and counterbores (relative to common datum features), two feature control frames are used.

Counterbored Hole Callout
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