How to judge the mechanical performance of wheel bolts?

Now,in the market,all of wheel bolts almostly are claimed to be 10.9 grade.But,it is a important problem that how to identify the real 10.9 grade wheel bolt.
Actually,the judgment based on the material,hardness,tensile testing and torque testing as well as anti-fatigue testing.

We insists on the imported material SCM435 to produce 10.9 grade wheel bolt,.Besides,it must be heat treated for 72 hours in the fully enclosed vacuum oven.
In addition to the hardness of wheel bolts rech the standard of 10.9 grade,the tensile and torque must also meet the required standards,as our latest TUV test report showing:

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