ADDA Mechanical Drafter Certification Practice Exam

Question: 1 / 400

Which term describes the smallest hole size in a basic hole system?

nominal

nominal minimum

maximum

minimum

The term that describes the smallest hole size in a basic hole system is "minimum." In engineering and drafting contexts, a basic hole system defines a standard method of delineating hole sizes with respect to tolerances. The minimum size represents the smallest allowable diameter that the hole can achieve while still maintaining its functional purpose.

In this system, the nominal size refers to the theoretical dimension or average of the hole size, whereas the maximum indicates the largest allowable size of the hole. The nominal minimum, while it may seem close to the correct answer, is not a standard term utilized in this context. The correct usage of "minimum" provides clarity in engineering applications by defining essential limits for hole specifications.

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