The classification of the hexagon socket bolts

Update:01-11-2018
Summary:

1. The nominal tensile strength of bolt material is up […]

1. The nominal tensile strength of bolt material is up to 400MPa;
2. The yield ratio of the bolt material is 0.6; the nominal yield strength of the bolt material is 400×0.6=240MPa.
Performance grade 10.9 high strength bolts, after heat treatment, can achieve:
1. The nominal tensile strength of bolt material is up to 1000MPa;
2. The yield ratio of the bolt material is 0.9; the nominal yield strength of the bolt material is 1000×0.9=900 MPa.
The meaning of the performance level of the hexagon socket bolt is the international standard. The bolts of the same performance grade have the same performance regardless of the difference between the material and the place of production. Only the performance grade can be selected in the design.
The classification of the hexagon socket bolts is basically the same. The grades on the market are definitely different. Generally, high-strength hexagon socket bolts are definitely much higher than ordinary hexagon socket bolts. The more commonly used in the market are still 4.8, 8.8, 10.9, and 12.9.
The head of the hexagon socket bolt is eccentric, and it may cause serious problems if it is smashed. For example, from the appearance of the product, the overall is not beautiful. There is also an eccentricity, which can easily lead to the break of the production tool. The most serious problems can also lead to a series of problems such as the break of the hexagon socket bolt.