The designation ".50-13 UNC-2A" means ____.
A. the minor diameter of the thread is 0.50 inches, there are 13 threads per inch, the classification is Unified National coarse, general purpose moderate tolerance, external thread
B. the major diameter of the thread is 0.50 inches, there are 13 threads per inch, the classification is Unified National coarse, general purpose moderate tolerance, internal thread
C. the major diameter of the thread is 0.50 inches, there are 13 threads per inch, the classification is Unified National coarse, general purpose moderate tolerance, external thread
D. the major diameter of the thread is 0.50 inches, there are 13 pitches per inch, the classification is Unified National coarse, general purpose moderate tolerance, external thread
E. none of the above
Answer: C
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