An implied datum is an assumed plane, axis, or point from which a dimensional measurement is made.

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An implied datum is an assumed reference point or axis that is used as a starting point for taking dimensional measurements. It is not explicitly stated but is assumed based on the design or function of the part being measured. An example of an implied datum could be a flat surface on a part that serves as a reference plane for taking height measurements.

An Implied Datum Is an Assumed Plane, Axis, or Point