Durchmessern

Durchmessern is a German verb used in mechanical engineering and related fields. It denotes performing one of two related actions concerning a circular feature: either measuring its diameter or producing a feature with a specified diameter. In measurement contexts, Durchmessern means determining the diameter of a component or hole with precision instruments such as calipers, micrometers, dial gauges, or bore gauges. The result is expressed in units of length, typically millimeters or inches, together with a stated tolerance.

In manufacturing contexts, Durchmessern refers to finishing a bore or hole to a required diameter. This can involve enlarging, refining, or removing material to achieve the target size, commonly by reaming, boring, or honing. Finishing steps are guided by technical drawings and tolerances (for example, corresponding fit classes). The term emphasizes the final dimensional exactness of the circular feature rather than just rough sizing.

Etymology: The word combines Durchmesser (diameter) with the suffix -ern to form a verb meaning “to make or assess a diameter.” Usage varies by region and company; more explicit phrases such as Durchmesser messen (to measure the diameter) or eine Bohrung auf Durchmesser nacharbeiten (to finish a bore to a given diameter) are also common.