How is a screw thread used as a datum axis unless otherwise specified, and what do you specify if you do not want the implied definition?
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When a screw thread is used as a datum axis, the datum axis is established from the pitch cylinder unless otherwise specified. If another feature of the screw thread is desired, then a note such as MAJOR DIA or MINOR DIA is placed next to the datum feature symbol. For example, the note MAJOR DIA is specified when the datum axis is established from the major diameter cylinder.
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