A 3/8 inch UNC bolt is being discussed. Technician A says that the bolt diameter is 3/8 inch and that it has 16 threads per inch. Technician B says that the bolt meets the measurement standards developed by the University of North Carolina. Who is correct?

Question

Quizplus · Accepted Answer

Technician A is correct because a 3/8 inch UNC bolt indeed has a diameter of 3/8 inch and typically has 16 threads per inch as part of the Unified Thread Standard, not the University of North Carolina. Technician B is incorrect; UNC stands for Unified National Coarse, a standard for threads, not a reference to the University of North Carolina.

A 3/8 Inch UNC Bolt Is Being Discussed