North Carolina Building Contractor License Practice Exam

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What is the diameter thickness of a No.5 rebar?

0.5 inches
0.6 inches
0.625 inches
0.75 inches

The correct answer is: 0.625 inches

The diameter thickness of a No.5 rebar is correctly identified as 0.625 inches. Reinforcing bars, commonly referred to as rebar, are typically sized according to a standardized numbering system, where the number corresponds to a certain diameter measurement in eighths of an inch. For No.5 rebar, the number 5 indicates a diameter of 5/8 of an inch. When converted to decimal form, 5/8 inches equals 0.625 inches. This standard measurement is crucial in construction and engineering, as it informs the structural integrity and load-bearing capacity of concrete elements in construction projects. Understanding these measurements is essential for compliance with building codes and ensuring the safety and durability of structures.