Question

5/16 - 18 unc
1.00
0.50
no answer text provided.
iso thread note
unified national thread note
no answer text provided.

Explanation:

UNC stands for Unified National Coarse. In engineering and technical drawings, the notation like 5/16 - 18 UNC is used to denote a Unified National Thread. The "5/16" represents the nominal diameter of the thread, "18" is the number of threads per inch, and "UNC" indicates it is a Unified National Coarse - type thread. ISO threads have a different designation system (e.g., M for metric ISO threads like M6×1).

Answer:

Unified National Thread Note