DIN 912 Specifications

All measurements in millimeters (mm)

The strength of hexagon socket bolts is divided into several levels. The more common ones are 4.8, 8.8, 10.9 and 12.9. The larger the number, the higher the strength. The environment and conditions of the use of different strength bolts are different, so it must be determined before use Whether its strength meets the requirements of use, if the strength is not up to the standard, it will cause the bolt to break and damage prematurely. Generally, the 4.8-level hexagon socket bolt is called the ordinary type, and the 8.8-level hexagon socket bolt can be called the strength hexagon socket bolt. Many steel structure construction occasions require the use of high-strength bolts to meet practical applications.

How should the strength of hexagon socket bolts be judged? Especially for high-strength bolts, the correct identification method must be mastered when judging. Generally, high-strength refers to the two parameters of "friction" and "pre-tightening". But many people can easily fall into misunderstandings.