What is the difference between high strength bolts and ordinary bolts

High-strength bolts.

The differences from ordinary bolts are as follows:

1.From the perspective of raw materials, high-strength bolts are made of high-strength materials. Screws and nuts for high-strength bolts.

and gaskets are made of high-strength steel, commonly used 45 steel.

40 boron steel, 20 manganese titanium boron steel. Q235 steel is commonly used for ordinary bolts.

Fabricate. 2.From the point of view of strength grade, high-strength bolts are increasingly used. Commonly used and two strength grades, with the medium being the majority. The strength grade of ordinary bolts should be low, generally grade, grade, grade and grade.

3.From the perspective of force characteristics, ordinary bolt connections rely on the shear resistance of the bolt rod and the pressure of the hole wall to transmit the shear force.

In addition to its high material strength, the high-strength bolt also exerts a large pretension force to the bolt, so that the squeezing force is generated between the connecting members, so that there is a great friction force perpendicular to the direction of the screw.

Extended information: high-strength bolt connection is through the bolt rod in a large tightening pretension to clamp the plate of the connecting plate, enough to produce a large friction, so as to improve the integrity and stiffness of the connection, when subjected to shear force, according to the design and force requirements of the different, can be divided into high-strength bolt friction type connection and high-strength bolt compression type connection two kinds, the essential difference between the two is that the limit state is different, although it is the same kind of bolt, but in the calculation method, requirements, scope of application and other aspects are very different.

In the shear design, the friction connection of high-strength bolts is to reach the maximum possible friction provided by the bolt tightening force between the contact surfaces of the plate as the limit state, that is, to ensure that the internal and external shear force of the connection does not exceed the maximum friction during the whole service period. The plate will not be deformed relative to slip (the original void between the screw and the hole wall will always be maintained), and the connected plate will be stressed according to the elastic whole.

In the shear design, the external shear force is allowed to exceed the maximum friction force in the high-strength bolt compression connection, and the relative slip deformation occurs between the connected plates until the bolt rod is in contact with the hole wall, and then the connection is jointly transmitted by the bolt shaft shear and the hole wall pressure and the friction between the plate contact surface, and finally the shaft shear or hole wall pressure failure is taken as the limit state of the connection shear.

Encyclopedia — ordinary bolts.

There are three differences:

1. Ordinary bolts are generally made of ordinary carbon structural steel, without heat treatment, and high-strength bolts are generally made of high-quality carbon structural steel or alloy structural steel, which need to be quenched and tempered to improve the comprehensive mechanical properties.

High strength is divided into, grade, grade, grade.

2. From the strength level:

High-strength bolts are commonly used and two strength grades.

Ordinary bolts generally have grades, grades.

Levels. 3. The pretension force is applied from the high-strength bolt with the force characteristics and the external force is transmitted by friction, and the ordinary bolt transmits the shear force by the shear force of the bolt rod and the pressure of the hole wall.

Bolts: mechanical parts, cylindrical threaded fasteners with nuts. A type of fastener consisting of a head and a screw (a cylinder with an external thread) that is used in conjunction with a nut to fasten two parts with through holes.

Extended Materials. Application of bolts:

Bolts are indispensable in daily life and industrial manufacturing, and bolts are also known as industrial rice. It can be seen that the use of bolts is extensive.

The application scope of bolts includes: electronic products, mechanical products, digital products, power equipment, mechanical and electrical machinery products. Bolts are also used in ships, vehicles, hydraulic projects, and even chemical experiments.

Anyway, there are a lot of places where bolts are used. Such as the precision bolts used in digital products.

Mode of force. Ordinary and with hinged holes. The ordinary main bearing axial force can also carry the transverse force with low requirements. The bolts used for reaming the hole should be matched with the size of the hole and used when subjected to transverse forces.

The standard size of ordinary screw threads is divided into more than 10 grades, and the intermediate and above bolts are made of low-carbon alloy steel or medium-carbon steel and heat-treated, commonly known as high-strength screws, and the rest are commonly referred to as ordinary screws.

French engineer Renault saw that there were many specifications of wire ropes on hot air balloons, so he thought of a way to get a number by opening 10 to the 5th power, and then multiplying them to get 5 priority numbers.

This is an equal proportional series, the latter number is a multiple of the previous number, then there are only 5 kinds of wire ropes below 10 at once, and there are only 5 kinds of wire ropes from 10 to 100, that is, 10, 16, 25, 40, 63.

1. The standard size of the screw thread is composed of two parts of numbers, which represent the nominal tensile strength value and yield ratio of the bolt material. For example:

1. The meaning of the bolt at the performance level is:

1. The nominal tensile strength of the bolt material is up to 400MPa;

2. The yield ratio of the bolt material is;

3. The nominal yield strength of the bolt material is up to 400 grades.

Second, the performance level of high-strength bolts, the material of which can be achieved after heat treatment

1. The nominal tensile strength of the bolt material is up to 1000MPa;

2. The yield ratio of the bolt material is;

3. The nominal yield strength of the bolt material is up to 1000 grades.

First, the standards may be different;

Second, the material is different;

Third, the processing method may be different;

Fourth, the use of the occasion is different;

Fifth, ** is not the same.

What is the difference between high-strength bolts and ordinary bolts, the following Zhongda Consulting will answer for you.

High-strength bolts are mainly used in steel structure engineering, used to connect the connection points of steel structure steel plates, a very important feature of high-strength bolts is limited to single use, generally used for permanent connection, and it is strictly forbidden to reuse high-strength bolts.

From the raw material:

High-strength bolts are manufactured from high-strength materials. The screws, nuts and washers of high-strength bolts are made of high-strength steel, and 45 steel, 40 boron steel, and 20 manganese, titanium, and boron steel are commonly used. Ordinary bolts are commonly made of Q235 steel.

In terms of intensity rating:

High-strength bolts, which are increasingly widely used. Commonly used and two strength grades, with the medium being the majority. The strength grade of ordinary bolts should be low, generally grade, grade, grade and grade.

From the point of view of the force characteristics:

High-strength bolts apply pretension and rely on friction to transmit external forces. Ordinary bolt connection relies on bolt rod shear resistance and hole wall pressure to transmit shear force, and the pretension force is very small when tightening the nut, and its influence is negligible, and the high-strength bolt in addition to its material strength is very high, also exerts a large pretension force to the bolt, so that the extrusion force is generated between the connecting members, so that there is great friction force perpendicular to the direction of the screw, and the pretension force, the anti-slip coefficient and the type of steel all directly affect the bearing capacity of the high-strength bolt.

According to the characteristics of the force, it is divided into pressure type and friction type. The calculation method is different. The minimum specification of high-strength bolts is M12, and the performance of oversized bolts is unstable, so it should be used cautiously in design.

The main difference between high-strength bolts and ordinary bolts is the difference in mechanical properties, chemical composition, and use environment, of course, the processing technology is also different, high-strength bolts are subject to heat treatment, while ordinary bolts do not have to be heat treated.

First, the difference in production process:

1. Grade A and B are refined bolts.

2. Grade C is a crude bolt.

Second, the difference in usage rate:

1. Class A and B bolts are rarely used.

2. C-grade bolts are often used.

3. The difference between material performance grades:

1. The performance grade of grade A and B bolt materials is graded.

2. The performance grade of C-grade bolt material is grade or grade.

The main difference between high-strength bolts and ordinary bolts! Hello, glad to answer for you. The main differences between high-strength bolts and ordinary bolts are:

From the perspective of raw materials, high-strength bolts are made of high-strength materials. The screws, nuts and washers of high-strength bolts are made of high-strength steel, and 45 steel, 40 boron steel, and 20 manganese, titanium, and boron steel are commonly used.

Ordinary bolts are commonly made of Q235 steel. From the point of view of strength grade, high-strength bolts are increasingly used.

Commonly used and two strength grades, with the medium being the majority. The strength grade of ordinary bolts should be low, generally grade, grade, grade and grade. From the point of view of the force characteristics:

High-strength bolts apply pretension and rely on friction to transmit external forces. Ordinary bolt connection relies on bolt rod shear resistance and hole wall pressure to transmit shear force, and the pretension force is very small when tightening the nut, and its influence is negligible, and the high-strength bolt in addition to its material strength is very high, also exerts a large pretension force to the bolt, so that the extrusion force is generated between the connecting members, so that there is great friction force perpendicular to the direction of the screw, and the pretension force, the anti-slip coefficient and the type of steel all directly affect the bearing capacity of the high-strength bolt. According to the characteristics of the force, it is divided into pressure type and friction type.

The calculation method is different. The minimum specification of high-strength bolts is M12, commonly used M16 M30, and the performance of oversized bolts is unstable, so it should be used cautiously in design. Hope mine can help you!

Do you have any other questions?

The bolts of grade and above are made of low-carbon alloy steel or medium-carbon steel and are heat-treated (quenched and tempered), commonly known as them.

It is a high-strength bolt, and the rest of the following are commonly called ordinary bolts. The bolt performance grade is composed of two numbers, which represent the nominal tensile strength value and yield ratio of the bolt material.

The nominal tensile strength is 800n mm2