Screws are also a type of fastener consisting of two parts, the head and the screw. They can be divided into three categories according to their application: machine screws, set screws and special purpose screws. The machine screw is mainly used for a tightly threaded part and a tight connection with a part with a through hole. No need for a nut fit (this type of connection is called a screw connection and is also a detachable connection; Fitted with a nut for a secure connection between two parts with through holes.) The set screw is primarily used to secure the relative position between the two parts. Special purpose screws such as eyebolts are used for lifting parts.
The nut has an internally threaded hole and is generally in the shape of a flat hexagonal column. It is also in the form of a flat square or a flat cylinder. It is fitted with bolts, studs or machine screws for fastening two parts to make it a The whole piece.
Self-tapping screws are similar to machine screws, but the threads on the screw are dedicated self-tapping screws. It is used to fasten and connect two thin metal members to make them integral. The holes need to be made in advance on the members. Since the screws have high hardness, they can be directly screwed into the holes of the members. Responsive internal thread
Wood screws are similar to machine screws, but the threads on the screw are special wood screw threads that can be screwed directly into the wood component (or part) for a metal (or non-metal) part with a through hole. The wooden components are fastened together. This connection is also a detachable connection.
