What tool is used for fastening metal to metal with a wrench?

The tool used for fastening metal to metal with a wrench is a machine bolt. A machine bolt is a type of fastener typically used in conjunction with a nut to create a secure connection. It features a uniform diameter and is made to be driven through pre-drilled holes in metal parts, allowing for tight assembly once the nut is threaded onto the bolt. The use of a wrench to turn the nut on the bolt provides the leverage needed to create sufficient clamping force, ensuring a stable and reliable joint between the metal components.

In contrast, a pipe wrench is designed specifically for gripping and turning pipes, not for fastening metal components together. Screws can also fasten materials, but they usually do so without the use of a wrench; instead, they are driven in with a screwdriver. Rivets are used for permanent fastening but require a different installation method, typically involving deformation of the rivet itself rather than being turned with a wrench.