Standard fasteners are divided into ten categories, and the selection should be determined according to the use occasion and function of the standard fasteners.
①Bolts: Bolts are generally matched with nuts (usually plus a washer or two washers), and are used for connection and fastening occasions.
②
Nut: match the nut with the bolt.
③
Screw: The screw is usually used alone (sometimes with a washer), and generally serves as a fastening or tightening function.
④ Stud: studs are generally threaded at both ends (single-end studs are threaded at one end), usually one end of the rib is firmly screwed into the body of the component, and the other end is matched with the nut to play the role of connection and fastening , But to a large extent still has the role of fixed distance.
⑤ Washer: The washer is placed between the supporting surface of bolts, screws, nuts, etc. and the process supporting surface to prevent loosening and reduce the stress on the supporting surface.
⑥Self-tapping screw: The screw hole of the workpiece matching with the self-tapping screw does not need to be tapped in advance. When the self-tapping screw is screwed in, the internal thread is formed.
⑦ Rivet: One end of the rivet has a head, and the rod has no thread. When in use, the rod is inserted into the hole of the connected piece, and then the end of the rod is riveted to play the role of connection or fastening.
⑧Pin: The pin is inserted into the workpiece when in use, and usually plays a role of connection or positioning.
⑨ Retaining ring: The retaining ring is usually on the shaft or in the hole, and plays the role of limiting the axial direction of the workpiece.
⑩Wood screws: Wood screws are used to screw into wood to connect or fasten.
