Is a bolt made from steel?

Bolts can be made of various kind of metal. They are mostly made of steel that has been hardened to make them stronger. A traditional hex bolt has a head that is forged using either a hot or cold forming process. In the hot-forging method steel is cut to length, one end is heated to 800-1200 degrees Fahrenheit. Using an upsetter or press the material is forced into dies that form the steel into the desired pattern. Cold form uses large machines that form coils of steel wire in a process that creates a finished bolt.