Which group of thread sizes is listed as NC thread sizes?

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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

Which group of thread sizes is listed as NC thread sizes?

Explanation:
National Coarse threads use the coarser pitch family, meaning fewer threads per inch for a given diameter. The group given includes three sizes that all have coarse pitches: 12-24, 1/2-13, and 10-24. Each of these is a coarse-thread combination for its diameter, typical of NC (often aligned with UNC in modern terminology). The other groups mix sizes that include finer pitches (for example, 6-32, 5-40, 4-40, 3/16-24, 1/8-22, and even 1-80), which are not all coarse. So the trio that stays within the coarse-thread family best represents NC thread sizes.

National Coarse threads use the coarser pitch family, meaning fewer threads per inch for a given diameter. The group given includes three sizes that all have coarse pitches: 12-24, 1/2-13, and 10-24. Each of these is a coarse-thread combination for its diameter, typical of NC (often aligned with UNC in modern terminology). The other groups mix sizes that include finer pitches (for example, 6-32, 5-40, 4-40, 3/16-24, 1/8-22, and even 1-80), which are not all coarse. So the trio that stays within the coarse-thread family best represents NC thread sizes.

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