Wedge anchors are used for fastening fixtures onto a concrete base. These anchors are designed to hold the weight of the material being attached. A wedge anchor can come in different types. It is important that you know the right anchor for the job because their composition and size can affect their performance. Here are the various types of concrete anchors that you can choose from.
Types Based on Steel Used to Make Wedge Anchors
1. Stainless Steel Anchors
These are the most ideal anchors for all types of environments or jobs. Made from stainless steel, these anchors are more durable and rust resistant compared to all the other types available. They are also the most expensive type of anchors.
Still, the anti-rust properties of these anchors depend on the type of stainless steel used, which typically include Type 303, 304, or 316. Type 303 stainless steel can fight off the effects of most chemicals, whether organic or inorganic. Meanwhile, anchors made from Type 316 stainless steel have the best protection against rust or corrosion even under harsh environmental conditions, including exposure to seawater.
2. Galvanized Anchors
These anchors are mechanically galvanized or hot-dipped, which gives them a reasonable amount of protection against rust or corrosion. Mechanically galvanized anchors can be installed outdoors and even in humid surroundings. Apart from concrete bases, they can be used with treated lumber.
However, these wedge anchors are not ideal for environments that are totally exposed to the elements. Rusts can still develop on them, which can ultimately compromise the sturdiness of this type of anchor. To get the most out of galvanized anchors even if installed outdoors, make sure to use them only in areas that are not heavily polluted.
3. Zinc Plated Anchors
These anchors are the most common among all types and they perform very well when used indoors and with relatively light fixtures. However, the zinc plating provides very little resistance against rust and corrosion, making this type of anchor unsuitable for outdoor use. Zinc plated anchors are also not recommended for use with treated lumber.
Types Based on Wedge Anchor Threading
Apart from the types of steel used in manufacturing wedge anchors, the threading found on the main piece or the rod of the anchor assembly can also be used as a basis for classifying these devices. There are two main types of threading applied to anchors.
1. Fully Threaded Wedge Anchors
The threading on these anchors runs for the entire length of the steel rod. Fully threaded anchors provide more flexibility because you can fully adjust their leveling or shimming to match your needs.
2. Partially Threaded Anchors
The threading for these anchors runs for only 1/3 of the length of their steel rods. A partially threaded anchor cannot be installed if the hole in which it will be embedded in has not been drilled according to the required depth and diameter.
A type of partially threaded anchor, called full-bodied anchor, is made from special steel that offers a higher level of durability and stability. Full-bodied anchors are more reliable than fully threaded and other types of partially threaded wedge anchors.