How to choose high-strength bolts?

As an indispensable component of mechanical components, bolts are widely used in the fixation and connection of various mechanical equipment. In production practice, due to the different loads, environments, and usage conditions of different mechanical equipment, there are also different requirements for the variety, performance, and quality of bolts. This article will analyze and explain the selection, materials, standards, and installation issues of high-strength bolts.

1、 Selection of high-strength bolts

For the selection of high-strength bolts, the following points need to be noted:

1. Load characteristics and working environment: During the use of high-strength bolts, the load they bear and the environmental conditions they are subjected to are very important. Therefore, it is necessary to fully consider these factors during the selection process and select the corresponding high-strength bolts according to the actual situation.

2. Material selection: There are various types of materials for high-strength bolts, and high-strength bolts that meet national or industry standards should be selected based on actual needs, and ensure that the selected high-strength bolts meet the corresponding standard requirements.

3. Quality assurance: During the selection process, it is necessary to fully consider the supplier's quality assurance measures and select high-strength bolts with guaranteed quality.

2、 Materials for high-strength bolts

There are various materials for high-strength bolts, but according to international classification, they are usually divided into two categories: ordinary carbon steel and alloy steel. Among them, alloy steel bolts are divided into two categories: alloy structural steel and high-strength alloy steel. In actual production, material types are usually selected according to actual needs to meet the required strength and wear resistance.

3、 Standard for high-strength bolts

There are many national and industry standards for high-strength bolts, such as ASTM in the United States, DIN in Germany, ISO, and other standards. In practical applications, it is necessary to select the corresponding standards and corresponding models according to actual needs. Usually, high-strength bolts are classified according to their different properties such as material and strength, and standardized separately. For example, ISO standards standardize high-strength nuts, high-strength bolts, and high-strength studs separately.

4、 Installation of high-strength bolts

When installing high-strength bolts, the following points need to be noted:

1. Preparation of bolts: Before installation, the screws need to be cleaned thoroughly to ensure that their installation surface is flat, smooth, and free of burrs.

2. Tightening force: During installation, it is necessary to increase the tightening force appropriately to ensure reliable fastening of the fixed parts and also to ensure the fatigue resistance of the screws. However, it is necessary to be careful not to tighten too tightly to avoid problems such as deformation and fracture.

3. Regular inspection: During the use of high-strength bolts, it is necessary to regularly check their fastening status to avoid equipment safety accidents caused by looseness.

In summary, selecting high-strength bolts requires full consideration of factors such as load characteristics, working environment, materials, standards, and installation, in order to select suitable products to meet practical needs. During the installation process, attention should also be paid to the preparation, tightening force, and regular inspection of the bolts to ensure that the clamping force of the bolts meets the standard requirements, making the equipment operate more safely, stably, and reliably.