What is the diameter of number 5 rebar?

The diameter of number 5 rebar is actually 5/8 inch. This sizing system relates directly to the nominal number associated with the rebar, where the number denotes the approximate 1/8 inch increments in diameter. Therefore, a number 5 rebar, correlating to 5, indicates a diameter of 5/8 inch. This classification is significant in the construction industry for determining structural integrity and the proper materials needed for various applications. Understanding these specifications helps contractors select the right rebar for reinforcement in concrete, ensuring durability and strength in construction projects.