Which of the following rivets must be heat treated before use?

The correct answer is 2017T. This rivet is made from an alloy that requires heat treatment to achieve its maximum strength and other desirable properties. The 2017 alloy is often used in aerospace applications due to its high strength-to-weight ratio and excellent mechanical properties; however, it must be heat treated after fabrication to ensure these attributes are realized.

In contrast, while options like 2117T and 2024T can also provide good strength, they have different treatment requirements or may come in forms that do not necessitate prior heat treatment. For example, 2117T rivets are typically used in applications where high strength is not critical and are often used in non-structural applications. The 2024T rivet relies on a different alloy composition, and though it benefits from heat treatment, it is often available in forms that can be used as is depending on the specific application.

The 2017T-HD represents a variation of the 2017T alloy which incorporates additional provisions, yet the specifics of its treatment might align closely with the 2017 alloy.

Understanding the requirements for heat treatment of different alloys is essential for ensuring safety and performance in aviation applications.

In this context, 2017T is specifically