Question 230General Subjects - QMED

70% to pass

The letters 'NC' in '1/4-20 NC' indicates the bolt is _______________.

Diagram for USCG General Subjects QMED: The letters 'NC' in '1/4-20 NC' indicates the bolt is _______________.
Athreaded with national coarse threads
Bmade of nickel-cadmium metal
Cmade of non-corrosive metal
Dnot clad with any coating
AI Explanation

The correct answer is A) threaded with national coarse threads. The 'NC' in '1/4-20 NC' refers to the thread designation 'National Coarse', which is a standard thread pattern commonly used in the United States. This thread pattern has a larger thread pitch compared to the 'National Fine' (NF) thread, making it suitable for applications where greater strength or faster assembly is required. The other answer choices are incorrect because they do not accurately represent the meaning of the 'NC' designation in the bolt specification. Option B is incorrect as it refers to the material composition, while options C and D are not directly related to the thread type indicated by 'NC'.

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Official Resources
46 CFR Machinery & Electrical 46 CFR Engineering USCG National Maritime Center
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