What is the primary material used in 2117 rivets?

The primary material used in 2117 rivets is aluminum alloy. These rivets are part of the 2xxx series of aluminum alloys, which are known for their high strength-to-weight ratio. This characteristic makes them particularly suitable for aircraft construction, where both strength and weight considerations are critical.

Aluminum alloy 2117 features good corrosion resistance and is often used in aircraft structures due to its ability to maintain integrity under extreme conditions. The alloy is typically used as a general-purpose material for rivets due to its balance of strength and workability. Hence, it's essential in various applications where safety and performance are paramount.

In contrast, the other materials listed do not pertain to 2117 rivets. Steel alloy is heavier and is generally used in applications requiring higher tensile strength, while brass and copper alloys have different properties and applications, such as electrical conductivity and resistance to corrosion, which do not align with the requirements for aircraft rivets.