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The hex head bolt manufacturer will show you: the performance grade of the hex head bolt

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The hex head bolt manufacturer tells you that the performance grades of bolts for steel structure connections are divided into more than 10 grades such as 3.6, 4.6, 4.8, 5.6, 6.8, 8.8, 9.8, 10.9, and 12.9. The bolts of grade 8.8 and above are made of low-carbon alloy steel or Medium-carbon steel is heat-treated (quenched and tempered) and is generally called high-strength bolts, and the rest are generally called ordinary bolts. The hex head bolt manufacturer tells you that the performance grade of large hexagon bolts consists of two numbers, which respectively represent the nominal tensile strength value and the yield ratio of the bolt material.

customized hex head bolt
For example, a bolt with a performance level of 4.6 for large hexagon bolts, its meaning is:
1. The hex head bolt manufacturer tells you that the nominal tensile strength of the material of the large hexagon bolt is 400MPa;   
2. The hex head bolt manufacturer tells you that the yield ratio of the large hexagon bolt material is 0.6;   
3. The hex head bolt manufacturer tells you that the nominal yield strength of the large hexagon bolt material is 400×0.6=240MPa, and the performance level is 10.9 high-strength bolts.
After heat treatment, the material of large hexagon bolts can reach:   
1. The hex head bolt manufacturer tells you that the nominal tensile strength of the material of the large hexagon bolt is 1000MPa;  
2. The hex head bolt manufacturer tells you that the yield ratio of the large hexagon bolt material is 0.9;   
3. The hex head bolt manufacturer tells you that the nominal yield strength of the material of the large hexagonal bolt is 1000×0.9=900MPa. The meaning of the bolt performance grade is an international standard. The bolts of the same performance grade, regardless of the difference in material and origin, their performance It is the same, only the performance level can be selected in the design.