Standard fasteners are divided into ten categories, and the selection should be determined according to the use of standard fasteners and their use functions.
(1) Bolts: Bolts are generally matched with nuts (usually add a washer or two washers) for connecting and fastening occasions.
(2) Nut: The nut is used with the bolt.
(3) Screws: Screws are usually used alone (sometimes with washers) and generally play a fastening or tightening role.
(4) Stud: Studs are generally threaded at both ends (single-ended studs are single-ended with threads), usually one end ribbed is firmly screwed into the part body, and the other end matches the nut, playing the role of connection and fastening, but to a large extent also has the role of fixed distance.
(5) Washer: The washer is used between the supporting surface of bolts, screws and nuts and the process supporting surface to prevent loosening and reduce the stress of the supporting surface.
(6) Self-tapping screw: The workpiece screw hole matching the self-tapping screw does not need to be pre-tapped, and the internal thread is formed while screwing into the self-tapping screw.
(7) Rivet: There is a head at one end of the rivet, and the rod is unthreaded. When in use, insert the rod into the hole of the connected part, and then rivete the end of the rod to play the role of connecting or fastening.
(8) Pin: The pin is embedded in the workpiece when used, and usually plays a role in connection or positioning.
(9) Retaining ring: The retaining ring is usually on the shaft or in the hole, which plays the role of restricting the axial direction of the workpiece.
(10) Wood screws: Wood screws are used to screw into wood and play a role in connecting or fastening.
Standards fasteners are divided into three types of communication.