@ emartin74 - Good question. There are different types of lag bolts that can be used depending on what you’re fastening. Zinc-plated lag bolts provide the minimum amount of against rust. Stainless steel lag bolts are highly resistant to corrosion from moisture and saltwater, so they would be good to use if you were building a deck on an oceanfront condo or house. Another type of lag bolt that can be used for this purpose is the galvanized lag bolt, which is recommended for use in coastal regions. Silicone-bronze lag bolts are also resistant to corrosion and are usually used for fastening wood timbers together.