A Cap screw is a threaded fastener designed to be used with a nut. It's important to note that this type of fastener is not to be confused with a bolt, as the latter must be installed into the existing threading of an object, whereas a cap screw can create its own threading when installed.

This type of fastener is ideal for use in projects that require a strong, durable connection between multiple components. It is also commonly used in heavy-duty and structural applications where a robust joint is required. These screws can be found in a variety of sizes and materials, each providing different levels of strength and resistance to environmental conditions or stresses.

For example, some of these screws are made from aluminum, which is a corrosion-resistant material often used in outdoor applications. Other fasteners are manufactured from stainless steel, which can withstand high temperatures and chemical exposure. Brass is an alloy of copper and zinc that resists rust and moderate atmospheric corrosion. It is nonmagnetic and electrically conductive.

Cap screws can be either fully or partially threaded, but the latter are typically designed for applications that don't provide enough room to install a full-length hex bolt. These fasteners are easier to tighten or loosen, and they don't need external clearance for a wrench or socket spanner to be applied. They are most commonly used in furniture manufacturing, automotive industry and industrial equipment, as well as in electronic applications.   Cap screw