What Are Bolts And Nuts?

Bolts and nuts are a common fastener in our daily life and are very versatile. Without them, many machines, equipment, transportation, etc. would not be able to function properly. So, what are bolts and nuts? This article will introduce in detail the concept, structure, classification and use of bolts and nuts.

1. The Concept Of Bolts And Nuts

Bolt, also known as a screw, is a cylindrical metal rod, usually with external threads, used to connect two objects. It usually needs to be used with nuts. The nut is the supporting fastener required by the bolt, usually hexagonal or other shapes with internal threads.

2. The Structure Of Bolts And Nuts

A bolt usually consists of a thread, a shank and a head. The thread refers to the helical thread formed on the surface of the bolt around its axis for one revolution. The shank is the part of the bolt not covered by the threads. The head is divided into flat head, semi-round head, hexagonal head and other types.

Nuts include general nuts, thick nuts, thin nuts, hexagonal nuts, stop nuts and other different types. The shape is usually hexagonal, and the inner hole is an internal thread, which is used to cooperate with the bolt. 

3. Classification Of Bolts And Nuts

Bolts are usually classified according to their use and structural characteristics, mainly in the following categories:

A. Classification by Application

The bolts can be classified according to different applications as follows:

Connecting bolts: connecting two objects, usually need to be used together with nuts.

Anchor bolts: Used to fix steel bars, plates, etc.

High strength bolts: Usually used to connect equipment or structures that are subjected to strong forces. 

B.Classification by Material

According to the different materials, the bolts can be divided into the following categories:

Carbon steel bolts: conventional material, inexpensive.

Stainless steel bolts: with certain corrosion resistance, more expensive than carbon steel bolts.

Alloy steel bolts: have excellent strength and durability, and can be used in various occasions.

There are also many kinds of nuts, which are divided into ordinary nuts, stainless steel nuts, etc. according to the material. According to the shape, they are divided into hexagonal nuts, round, square, flat nuts, etc.

4. The Use of Bolts and Nuts

Before using bolts and nuts, parameters such as required size and quality need to be determined in advance for proper selection and use.

The steps are as follows:

Determine the material and structural characteristics of the connected parts.

Select the corresponding bolt and its grade, and the corresponding nut according to the different conditions of action such as required tension, shear, vibration, etc.

Obtain the appropriate bolt length by calculation and machine the hole with appropriate specifications according to the required depth.

Insert the bolt into the hole and turn the nut to the proper tightness. 

Bolts and nuts are fasteners that we often come into contact with in our daily lives, and they are widely used in machine building, electronic equipment, automobiles, ships, transportation, construction, bridges and various large equipment. When selecting and using bolts and nuts, it is necessary to choose the corresponding type and grade according to different action conditions in order to ensure the safety and reliability of the connections. Bolts and nuts are one of the main products of Aozhan Fasteners, if you have any questions, welcome to contact us at info@aozhanfasteners.com, we are very happy to answer your questions.