Fasteners come in a variety of materials. The choice of materials will be decided by the application and environment. Steels and stainless steels are the most popular material options however aluminum and other non-ferrous alloys are also available. Depending on the material selected, different processes are required to obtain the proper mechanical properties. Heat treatment is a process used to increase mechanical strength, ductility, toughness and, for some alloys, its resistance to corrosion. The white paper will go thru a few examples of materials needing a heat treatment before being put in service.