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The Difference Between Bolts, Screws And Studs

Sep 23, 2020

Different methods of use


Bolts are widely used in detachable connections in mechanical manufacturing. Generally, 4102 is used in conjunction with nuts (usually plus a washer or two washers).


Studs are mostly used to connect one of the connected parts with a large thickness, and need to be used where the structure is compact or the bolt connection is not suitable due to frequent disassembly. Usually one thread is firmly screwed into the component body, and the other end is matched with the nut to play the role of connection and fastening, but to a large extent it also has the role of fixed distance.


Different shapes:


A bolt is a type of fastener consisting of a head and a screw (cylinder with external threads).


The stud has no head, only a type of fastener with threads on both ends.


A type of fastener consisting of a head and a screw, with threads on both ends.


1. Bolt:


Mechanical parts, cylindrical threaded fasteners with nuts. A type of fastener consisting of a head and a screw (cylinder with external threads), which needs to be matched with a nut to fasten and connect two parts with through holes. This type of connection is called bolt connection. If the nut is unscrewed from the bolt, the two parts can be separated, so the bolt connection is a detachable connection.


2. Stud:


Without a head, there is only a type of fastener with threads on both ends. When connecting, one end of it must be screwed into the part with internal threaded hole, the other end must pass through the part with through hole, and then the nut is screwed on, even if the two parts are tightly connected as a whole. This type of connection is called a stud connection, which is also a detachable connection. It is mainly used where one of the connected parts has a large thickness, requires a compact structure, or is not suitable for bolt connection due to frequent disassembly.


3. Screw:


It is also a type of fasteners composed of two parts, a head and a screw, which can be divided into three categories according to their uses: machine screws, set screws and special purpose screws. Machine screws are mainly used for a tightening threaded hole part, and a fastening connection between a part with a through hole, and no nut is required (this connection form is called a screw connection, which is also a detachable connection; it can also be It is matched with a nut and used for the fastening connection between two parts with through holes.) The set screw is mainly used to fix the relative position between the two parts. Special purpose screws, such as eyebolts, are used for lifting parts.