Classification Of Fastener Selection

Classification of fastener selection

① Bolts: Bolts are generally matched with nuts (usually with one or two washers) and are used in occasions where they play a connecting and tightening role.

② Nuts: Nuts are used in combination with bolts.

③ Screws: Screws are usually used alone (sometimes with washers) and generally play a tightening or fixing role.

④ Studs: Studs are generally threaded at both ends (single-head studs are threaded at one end). Usually, one end of the thread is firmly screwed into the body of the component, and the other end is matched with a nut, which plays a connecting and tightening role, but to a large extent also has a spacing role.

⑤ Washers: Washers are placed between the supporting surface of bolts, screws, nuts, etc. and the process supporting surface to prevent loosening and reduce the stress of the supporting surface.

⑥ Self-tapping screws: The screw holes of the workpieces matched with self-tapping screws do not need to be tapped in advance. When the self-tapping screws are screwed in, the internal threads are formed.

⑦ Rivets: There is a head at one end of the rivet, and the rod is not threaded. When in use, insert the rod into the hole of the connected part, and then rivet the end of the rod to connect or tighten.

⑧ Pin: The pin is inserted into the workpiece when in use, usually for connection or positioning.

⑨ Retaining ring: The retaining ring is usually on the shaft or in the hole, and plays a role in limiting the axial direction of the workpiece. ⑩ Wood screw: Wood screw is used to screw into wood for connection or tightening.