Threaded rod diameter is measured on the outside of the threads.
10-32 is a fine thread, but it is listed under coarse thread because it is very common.
NOTE: While 12tpi is the fine thread (UNF) standard, 14tpi is far more common in actual use.
A fully threaded rod with no head or drive. Commonly used in manufacturing, automotive, electrical, plumbing, and general construction applications.