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Common fastener types and names

2018-08-17

A general term for a class of mechanical parts used to securely join two or more parts (or components) into one piece. The market is also known as standard parts. It typically includes the following 11 types of parts - bolts, studs, screws, nuts, self-tapping screws, wood screws, washers, retaining rings, pins, rivets, assemblies. The less common ones in the table below are not shown.

Bolt A type of fastener consisting of a head or a screw (a cylinder with an external thread) that is fitted with a nut for fastening two parts with through holes. This form of connection is called a bolted connection. If the nut is unscrewed from the bolt, the two parts can be separated, so the bolt connection is a detachable connection.

Studs There are no heads and only one type of fastener with external threads on both ends. When connecting, one end must be screwed into the part with the internally threaded hole, the other end is passed through the part with the through hole, and then the nut is screwed, even if the two parts are fastened together as a whole. This type of connection is called a stud connection and is also a detachable connection. It is mainly used for the case where one of the connected parts has a large thickness, requires a compact structure, or is not suitable for bolting due to frequent disassembly.

Nuts with internal threaded holes, generally in the shape of flat hexagonal columns, but also in the form of flat square or flat cylinders, with bolts, studs or machine screws for fastening two parts to make them a whole .

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