From a structural point of view, a bolt consists of two parts: a head and a screw (a cylinder with external threads). A nut is an internally threaded part, usually hexagonal or octagonal, used in conjunction with a bolt or screw. The head design of the bolt makes it easy to tighten and loosen, while the external threads on the screw cooperate with the internal threads of the nut to achieve a tightening effect.
From a functional point of view, a bolt needs to be used in conjunction with a nut to provide a tightening force and connection by passing the bolt through one or more parts and fixing it on the other side with a nut. This type of connection is called a bolt connection, and it is a detachable connection, that is, the two parts can be separated by unscrewing the nut. In contrast, the main function of a nut is to fix the bolt or screw so that it is not easy to loosen or fall off.
In addition, in terms of application, bolts are generally used for through-hole connections, which can be easily replaced after damage; while nuts are mostly used for blind hole connections, and when the connected parts need to be disassembled frequently. In terms of material selection, the materials of bolts and nuts are usually carbon steel, stainless steel or non-ferrous metals, etc.
In summary, the main differences between bolts and nuts are:
Structure: Bolts consist of a head and a screw with external threads, while nuts are internal threaded parts.
Function: Bolts need to be used with nuts to achieve fastening connections, while nuts are mainly used to fix bolts or screws.
Application: Bolts are mostly used for through-hole connections, while nuts are mostly used for blind-hole connections.
These differences give them specific application scenarios and advantages in mechanical design and manufacturing.