Скачать или смотреть USPS EXAM 955 | Q10: What does 1/4-20 mean on a screw or bolt?

What does 1/4-20 mean on a screw or bolt?

A. ¼ " shaft, 20 threads per inch
B. ¼ pitch, 20mm long
c. number 1, 4mm shaft, 20mm long
d. None of the above

The Answer of The Question:
A. ¼ " shaft, 20 threads per inch

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