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The Three Concepts Of Bolts, Screws And Screws, Don't Be Silly

May 23, 2020

In life, bolts, screws, screws, etc. are often mentioned. What is the difference between them? In fact, the standard argument is that there are no screws or 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 to tighten the related parts. Nuts are commonly known as "nuts" in the standard. The head of the bolt is generally hexagonal, and the shaft has external threads. The screw is small, the head has a flat head, cross head, etc., and the shaft has an external thread. The stud should actually be called a "double-headed stud". Both ends have external threads, and the middle is generally a smooth rod. The long end of the thread is used to connect with the deep hole, and the short end is connected with the nut.


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


1. Bolt


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

2. Nut


The three concepts of bolts, screws, and screws, don't be silly!


3. Screws


The screw is usually used alone (sometimes with a washer), generally used for tightening or tightening, and should be screwed into the internal thread of the body.


4. Stud


The studs are mostly used to connect one of the connected parts with a large thickness, which needs to be used in a place where the structure is compact or the bolt connection is not suitable because of frequent disassembly. Studs are generally threaded at both ends (single-end studs are threaded at one end), usually one thread is screwed into the body of the component, and the other end is matched with the nut to play the role of connection and tightening To a large extent, it also has the function of setting a distance.


5. Wood screws


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


6. Self-tapping screws


The working screw hole matched with the self-tapping screw does not need to be tapped in advance, and the internal thread is formed while the self-tapping screw is screwed in.


7. Washer


Lock washers


The washer is used between the supporting surfaces of bolts, screws, nuts, etc. and the supporting surface of the workpiece to prevent loosening and reduce the stress on the supporting surface.


Lock washer



8. Retaining ring


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


The three concepts of bolts, screws, and screws, don't be silly!

Industrial meson


9. Sell


Pins are usually used for positioning, they can also be used to connect or lock parts, and can also be used as overload shearing elements in safety devices.



10. Rivets


The rivet has a head at one end, and the shank has no threads. When in use, the rod is inserted into the hole of the connected piece, and then the end of the rod is riveted for connection or fastening.


11. Connection Vice


The connection pair is a combination of screws or bolts or self-tapping screws and washers. After the washer is installed on the screw, it must be able to rotate freely on the screw (or bolt) without falling off. Mainly play the role of fastening or tightening.


12. Other


Mainly include welding nails and other content.


Determine varieties


(1) The principle of variety selection


① Considering the working efficiency of processing and assembly, within the same machine or project, the variety of fasteners should be minimized;


② For economic considerations, priority should be given to varieties of commodity fasteners.


③ According to the expected use requirements of fasteners, determine the selected varieties according to the type, mechanical properties, accuracy and thread.