How To Purchase An AS Fastener

When purchasing aircraft parts, there are many decisions that need to be made. One important decision is the type of fastener that will be used. Fasteners are what hold the aircraft together, meaning that this is one decision that should not be taken lightly. AS fasteners, or alloy steel fasteners, are a popular choice among buyers and mechanics alike. Here are some advantages to using AS fasteners.

Safer Alternative To Carbon Steel

Carbon steel fasteners are the cheapest ones produced. These are the types of bolts and screws that one can find at a local hardware store, and are not nearly as strong as alloy steel. Aircraft manufacturers and mechanics strongly advise against purchasing carbon steel for use in aerospace technology. They are significantly weaker than alloy steel, with an ultimate strength of 55 ksi (kilo-pound per square inch). While carbon is slightly more resistant to corrosion than alloy steel, most alloy steel bolts are treated to withstand corrosion.


Alloy steel is significantly stronger than carbon steel, capable of an ultimate strength of 300 ksi if treated properly. While alloy steel is more susceptible to corrosion than carbon, it is often treated to prevent this from occurring. In addition to being incredibly strong, alloy steel is also non-magnetic, which is an important aspect of a fastener.

Range Of Components

Another perk of going with an alloy steel fastener is that not all alloy steel fasteners are the same. There are a number of different other alloys that go into making alloy steel, and different grades of steel will be comprised of different metals. Things like iron, magnesium, silicon, and zinc are added to the product to increase strength and resistance to corrosion. Depending on the part, different grades are ideal for different uses. Purchasing an alloy steel fastener give the consumer additional options with respect to strength and purpose.

Can Be Used In Heat

Unlike other types of fasteners, alloy steel won’t harden or become brittle in the heat. In fact, alloy steel can perform in temperatures of up to 900 degrees Fahrenheit, making it an ideal alternative to carbon steel. Alloy steel can also perform in lower temperatures, with the danger of it becoming brittle setting in at -65 degrees Fahrenheit.

Corrosion Prevention

As mentioned, alloy steel is often plated with another element to prevent it from corroding. This helps increase the lifespan of the steel while protecting the safety of the aircraft. Two elements often used are cadmium and zinc.  Cadmium is the most common element used with aerospace fasteners, but zinc is also widely used. Each type of plating has their own benefits and drawbacks, and is something to discuss with a mechanic to ensure the correct type is selected.

Fastener Dimensions is a leading AN fastener supplier. They offers wide range of aerospace and military components and provide with a diverse and expansive collection of parts.

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