Number drills increase in size from #1 to #80.

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Prepare for the Machinist Apprentice Level One Test. Utilize flashcards and multiple choice questions, complete with hints and explanations, to ensure readiness for your exam!

Multiple Choice

Number drills increase in size from #1 to #80.

Explanation:
Numbered drill sizes work so that the diameter decreases as the number increases. In this system, a No. 1 drill is larger than a No. 80 drill, with No. 80 being one of the smallest bits. So the idea that drills increase in size from #1 to #80 is not correct—the sequence actually shows the opposite: size goes down as the number goes up. When you need a bigger hole, you’d use a drill with a smaller number (larger diameter) rather than a larger number.

Numbered drill sizes work so that the diameter decreases as the number increases. In this system, a No. 1 drill is larger than a No. 80 drill, with No. 80 being one of the smallest bits. So the idea that drills increase in size from #1 to #80 is not correct—the sequence actually shows the opposite: size goes down as the number goes up. When you need a bigger hole, you’d use a drill with a smaller number (larger diameter) rather than a larger number.

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