What material are structural bolts typically made from?

Structural bolts are typically made from materials that provide the necessary strength and durability for load-bearing applications, which is why they are commonly made from steel or other high-strength metals. The correct response indicates that structural bolts are generally manufactured from the same materials as structural screws. Both structural bolts and screws are usually made of steel, which may be treated for corrosion resistance or additional strength. This similarity ensures that both fasteners perform adequately in structural applications, offering crucial tensile and shear strength required in construction and aircraft assembly.

The other options present materials that do not possess the required mechanical properties for structural integrity. Composites, plastics, and wood lack the strength and thermal stability needed for critical engineering applications such as the assembly of aircraft structures. These alternative materials do not provide the reliability and endurance under stress that metal fasteners like structural bolts and screws deliver.