What is the diameter of a #3 ASTM standard reinforcing bar?

The diameter of a #3 ASTM standard reinforcing bar is 0.375 inches. This specific size is part of the standardized system used for reinforcing bars, which assigns a number to each rebar size based on its diameter in eighths of an inch. In this case, a #3 rebar has a diameter of 3/8 inches, which converts to 0.375 inches when expressed in decimal form. Understanding this standard is essential for ensuring that reinforced concrete structures have adequate strength and safety in alignment with engineering specifications.