Galvanized bolts are heavy-duty hardware with a zinc coating to prevent rust and corrosion. They can join wood or steel and are used in outdoor, marine, and industrial settings. Lag bolts are used when only one side of an object is accessible, while carriage bolts are used when both sides are accessible. Galvanized bolts are more expensive but reduce future maintenance costs and should be used with a zinc plated washer. Caution should be exercised when welding or cutting galvanized metal.
Galvanized bolts are a special type of hardware designed to outlast nails and screws in many applications. They feature a heavy-duty construction that allows them to support heavier loads than a nail or screw, as well as a special coating that helps prevent rust or corrosion damage. Galvanized bolts can be used to join wood or steel and are found in everything from bridge construction to residential decks.
Like many types of fasteners, galvanized bolts are made from steel, which is susceptible to rusting when exposed to moisture or chemicals. By applying a special zinc coating to the bolt, manufacturers extend its life along with strength and durability. Galvanizing also allows the bolt to be used in a much wider variety of applications due to its improved performance.
The galvanizing process actually consists of a series of chemical reactions. Initially the bolt is coated with hot zinc, which acts as a barrier between the steel and any potentially corrosive elements. Zinc oxide is formed when the zinc coating reacts with oxygen in the atmosphere. When carbon dioxide reacts with zinc oxide, zinc carbonate is formed. This zinc carbonate layer protects the bolt from corrosion and rust.
Galvanized bolts are distinguished by their crystallized and spangled surface. These bolts are primarily used in outdoor applications, where rain and humidity prohibit the use of standard steel fasteners. They are also used in coastal areas or marine environments, where exposure to salt water can rapidly corrode untreated steel. Finally, galvanized bolts are found in industrial settings, where chemical exposure often damages other fasteners.
These bolts come in two basic varieties, which can be classified by how they are installed. Lag bolts are used when only one side of an object is accessible. Bolts are installed into an object using a socket wrench and a washer is placed between the bolt head and the face of the object to prevent damage. When both sides of an object are accessible, carriage bolts are used. The carriage bolt is inserted through the front of the item, then a washer is added to the rear end of the bolt for added strength and support.
Galvanized bolts are typically more expensive than uncoated varieties, but their added strength can reduce future maintenance and repair costs. They should always be used with a zinc plated washer, as uncoated washers can affect the strength of the installation. Finally, installers should exercise caution when welding or cutting galvanized metal, as this may release toxic fumes or harmful particulates into the air.
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