Identification method for high-strength bolts

High strength bolts are an important type of bolt, characterized by high material and strength, and are typically used in applications that require high loads and strength. High strength bolts have been widely used in the engineering and manufacturing industries. However, due to their basic form being similar to ordinary bolts, it is difficult to distinguish their grade and performance indicators. Therefore, it is necessary to pay attention to accurate understanding and identification when purchasing and using high strength bolts. This article will introduce several identification methods for high-strength bolts.

1. Physical labeling method

The physical marking method for high-strength bolts is to first engrave or print on the raised part of the head, commonly used information includes manufacturer name, national standard number, manufacturing date, bolt grade, torque coefficient, etc. This information can identify the performance and level of bolts, which is beneficial for identification and use. When identifying, it is necessary to check the markings on the bolt heads to find their corresponding standards and levels.

2. Appearance identification method

High strength bolts are usually made using special production processes and materials, and their appearance is different from ordinary bolts. High strength bolts usually use surface treatment techniques such as galvanizing, nickel plating, hot-dip galvanizing, phosphating, etc. to improve their corrosion resistance and surface hardness. In addition, the threads of high-strength bolts are also different, usually with a triangular or polygonal cross-section, which is different from the cylindrical threads of ordinary bolts. By comparing the appearance and morphology, the type and performance of bolts can be preliminarily determined.

3. Strength testing method

High strength bolts can be tested for strength and performance using various methods, including tensile testing or transient strength testing. These methods can accurately determine the material and strength indicators of bolts, and determine whether the bolts meet the standards. When using high-strength bolts, the strength level can be checked and bolts that meet the requirements can be selected to ensure their normal use.

4. Packaging Identification Law

High strength bolts are usually packaged in multi-layer cardboard boxes or other containers, and for some brands and manufacturers, their names and grades will be marked on their packaging. When purchasing and using high-strength bolts, you can check the markings on their packaging to understand their standards and grades.

In summary, the identification and use of high-strength bolts require attention to multiple factors, including physical markings, appearance characteristics, strength testing, and packaging identification. When selecting and purchasing high-strength bolts, it is necessary to understand their basic properties and differences, to avoid selecting the wrong bolt type and specification and affecting safety and usage effectiveness.