What is the diameter of number 5 rebar?

The diameter of number 5 rebar is indeed 5/8 inch. Rebar, or reinforcing bar, is categorized by a numerical designation that corresponds to its diameter in eighths of an inch. Therefore, a number 5 rebar has a diameter of 5 eighths, which translates to 5/8 inch. This sizing system allows for a straightforward understanding of the dimensions of rebar based on its number, providing clear specifications for construction and engineering applications. Understanding these measurements is critical for professionals in the field to ensure proper reinforcement in concrete structures.