Final answer:
Screws are typically made from metals like steel for its strength and durability, aluminum alloys for their corrosion resistance and lightness, and titanium for its superior strength-to-weight ratio and corrosion resistance. Manual labor is often used to ensure precision in screw installation.
Step-by-step explanation:
Screws are commonly made from different types of metals depending on their intended use and requirements of their application. One common metal used for screws is steel, which is known for its strength and durability. Steel screws are a standard choice because they provide good resistance to shear and tensile forces, making them suitable for a wide range of applications. However, steel is susceptible to corrosion; thus, it sometimes needs to be coated or treated, or alternative materials like stainless steel or brass are used in corrosive environments.
Additionally, aluminum alloys are also utilized for screw manufacturing because of their resistance to corrosion and lightweight properties, which makes them ideal for applications where weight is a critical factor. In more demanding environments, such as those exposing screws to high levels of corrosion or in medical applications, titanium screws may be used for their excellent strength-to-weight ratio and superior resistance to corrosion.
For electrical applications, screws may sometimes be made of brass due to its good conductivity and corrosion resistance. When it comes to the assembly of products using screws, manual labor is often required to ensure precision and avoid over-tightening, which can strip the screw or damage the material it's being screwed into. While power tools can speed up the process, they also need to be used with care to maintain the integrity of both the screw and the assembled components.