What is the effect of the screw?
Special purpose screws such as rings are used for lifting parts.
The set screw is mainly used to hold the relative position between the two parts. We call the "head screw", the role of the equivalent of the role of positioning pin.
The machine screw is mainly used for a fastening screw hole part, with a through hole between the parts of the fastening connection, no need to match the nut (this connection is called the screw connection, also belong to the detachable connection; Used in conjunction with nuts for fastening connections between two parts with through holes.) Also the most common screws.
Screws are also called screws, and the screws can be divided into three categories: machine screws, set screws and special purpose screws.
