An automotive bolt has a designation of 12-13 unc auto technician a says the bolt is a coarse thread bolt auto technician b says the bolt has a diameter of 13millimeters which of the statements is co?
The first technician is correct, it is a coarse thread. I'm not sure there is a bolt called 12-13 so I am assuming you meant 1/2 - 13. Wich would be a bolt 1/2 inches long. The diameter of a #13 unc bolt would be ( 13 x .013in ) + .06 = .229 inches in diameter.
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