Standard fasteners are divided into ten categories. When selecting, it should be determined according to the application occasion and function of standard fasteners.

①Bolt: Bolts are generally matched with nuts (usually with one or two washers added) and are used in occasions for connection and fastening.

②Nut: Nuts are used in combination with bolts.

③Screw: Screws are usually used alone (sometimes with washers added) and generally play a fastening or setting role.

④Stud: Studs generally have threads on both ends (single-end studs have threads on one end). Usually, one end of the thread is firmly screwed into the component body, and the other end is matched with a nut to play a role in connection and fastening. To a large extent, it also has a spacing function.

⑤Washer: Washers are used between the bearing surfaces of bolts, screws, nuts, etc. and the process bearing surfaces to prevent loosening and reduce the stress on the bearing surface. ⑥Self-tapping screw: The workpiece screw hole matched with the self-tapping screw does not need to be tapped in advance. While screwing in the self-tapping screw, the internal thread is formed. ⑦Rivet: One end of a rivet has a head and the rod has no thread. When in use, insert the rod into the hole of the connected part, and then rivet the end of the rod to play a role in connection or fastening. ⑧Pin: Pins are inserted into workpieces when in use and usually play a role in connection or positioning.

⑨Retaining ring: Retaining rings are usually on shafts or in holes and play a role in restricting the axial direction of workpieces.

⑩Wood screw: Wood screws are used to be screwed into wood to play a role in connection or fastening.