The meaning of a bolt with a performance level of 4.6 is:
1. The nominal tensile strength of the bolt material reaches 400MPa
level;
2. The yield strength ratio of bolt material is 0.6;
3. The nominal yield strength of the bolt material reaches 400 ×
0.6=240MPa level
The meaning of a bolt with a performance level of 4.6 is:
High strength bolts with a performance level of 10.9, made of
materials that have undergone heat treatment, can achieve:
1. The nominal tensile strength of the bolt material reaches
1000MPa level;
2. The yield strength ratio of bolt material is 0.9;
3. The nominal yield strength of the bolt material reaches 1000 ×
0.9=900MPa level
The meaning of bolt performance grade is an internationally recognized standard. For bolts with the same performance grade, regardless of the
difference in material and origin, their performance is the same, and only the performance grade should be selected for design.
The strength grades of 8.8 and 10.9 refer to the shear stress levels of 8.8 GPa and 10.9 GPa for bolts
8.8 nominal tensile strength 800N/MM2 nominal yield strength 640N/MM2
Generally, bolts are represented by "X.Y" to indicate strength. X * 100=the tensile strength of this bolt, and X * 100 * (Y/10)=the yield strength of this bolt
(because according to the labeling regulations, yield strength/tensile strength=Y/10)
Like level 4.8
The tensile strength of this bolt is 400MPa; The yield strength is 400 * 8/10=320MPa.
Additionally, stainless steel bolts are usually labeled as A4-70 or A2-70, with different meanings to be explained