What is the minimum diameter anchor bolt that may be used without a noncorrosive coating?

The minimum diameter anchor bolt that may be used without a noncorrosive coating is 1/2 inch. This size is established based on standards that account for the bolt's ability to withstand environmental factors, including exposure to moisture and other corrosive elements. When anchor bolts are smaller in diameter, they are typically more vulnerable to corrosion and structural weaknesses over time.

Using a 1/2 inch diameter bolt minimizes these risks, as larger bolts generally provide greater structural integrity and resistance to corrosion-related failures. This requirement helps ensure that fixtures and structures remain secure over long periods, especially in environments where they may be exposed to the elements. Smaller diameter bolts, on the other hand, are considered less reliable in these conditions, which is why they require special coatings to enhance their durability against corrosion.