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What Is The Difference Between Screws, Bolts And Screws?

Nov. 26, 2019 | 00:00:00
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In life, bolts, screws, screws, etc. are often mentioned. What is the difference between them? In fact, the standard statement is that there are no screws and nuts. Screws are commonly known as "screws" with external threads. The shape of the nut is usually hexagonal, and the inner hole is an internal thread, which is used to cooperate with the bolt and tighten the related parts. Nuts are commonly known as "nuts" as standard. The head of the bolt is generally hexagonal, and the rod has external threads. The screw is small, the head has a flat head, a cross head, etc., and the rod has external threads. The stud should actually be called a "double-headed stud", with external threads at both ends, and generally a polished rod in the middle. The long end of the thread is used to connect with the deep hole, and the short one is connected to the nut.


Standard fasteners are divided into twelve categories, and the selection is based on the use occasion of the fastener and its use function.


1. Bolt

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

General purpose bolts: There are many varieties, there are hexagonal head and square head. Hex head bolts are the most common applications, and are mainly used in important, high assembly accuracy, and places subject to large shocks, vibrations or variable loads.


2. Nuts

General purpose nuts: There are many varieties, including hexagon nuts, square nuts and so on. Hex nuts are most commonly used in conjunction with hex bolts. Hex thin nuts are used as auxiliary nuts in anti-loosening devices to play a locking role, or where the threaded joint is mainly subjected to shear forces. Hex thick nuts are mostly used in connections that are often disassembled. The square nut is used with the square head bolt. It is difficult to slip when the wrench is stuck. It is mostly used for rough and simple structures.

Slotted Nut: Mainly refers to Hex Slotted Nut, that is, the groove is processed above the hexagon nut. It is used in combination with a screw bolt with a hole and a split pin to prevent the bolt and nut from rotating relative to each other.


Hex Slotted Nut


Hex Slotted Nut


Special-purpose nuts: such as Butterfly Nut, cap nut, knurled nut, and flush nut. The wing nut can generally be disassembled without tools, and is usually used in places where frequent disassembly and low force are needed; the cover nut is used in the place where the end screw cap needs a cover.


3. Screw

Screws are usually used alone (sometimes with washers), generally for tightening or tightening, and should be screwed into the internal threads of the body.


4. Studs

Studs are mostly used to connect one of the connected parts with a large thickness, which needs to be used in a place with a compact structure or due to frequent disassembly. Studs are generally threaded at both ends (single-headed studs are single-ended with threads). Usually, one end of the screw is firmly screwed into the body of the component, and the other end is matched with the nut to play a role of connection and fastening. To a large extent, it also has the function of distance.


5. Wood screws

Wood screws are used to screw into wood for connection or fastening.


6. Self-tapping screws

The working screw holes matched with self-tapping screws do not need to be tapped in advance. When the self-tapping screws are screwed in, the internal thread is formed.


7. Washers

The washer is used between the support surface of the bolt, screw and nut and the support surface of the workpiece to prevent loosening and reduce the stress on the support surface.


8. Retaining ring

The retaining ring is mainly used to position, lock or stop the part on the shaft or in the hole.


9. Pin

Pins are often used for positioning, but also for attaching or locking parts, and as overload shear elements in safety devices.


10. Rivets

The rivet has a head at one end, and the rod is unthreaded. When in use, the rod is inserted into the hole of the connected part, and then the end of the rod is riveted to play a role of connection or fastening.


The above is the classification of fasteners introduced by Hex Nut Manufacturer. Hope to help you.