Stainless steel bolts level. Stainless steel screws
  Austenitic stainless steel bolts, screws, studs, mechanical properties
Performance of the hierarchical classification of stainless steelbolts common sense
   Connection with the performance of steel bolts more than 10rating points 3.6,4.6,4.8,5.6,6.8,8.8,9.8,10.9,12.9 grades. Of which 8.8 and above or bolts made ​​of medium carbon steel andlow carbon steel by heat treatment (quenching and tempering),commonly known as high strength bolts, the rest is known asordinary bolts. Bolt grade level performance numbers have two parts, respectively, the nominal bolt material yield strength andtensile strength values ​​of the ratio.
For example, the performance level of 4.6 of the bolt, its meaning is:
        1, the bolt tensile strength of 400MPa nominal materiallevel;
        2, the bolt material yield strength ratio of 0.6;
        3, the nominal bolt material yield strength of 400 × 0.6 = 240MPa 10.9 grade level performance.
Bolt, the material after heat treatment, to achieve:
        1, the nominal tensile strength of bolt material 1000MPagrade;
        2, the bolt material yield strength ratio of 0.9;
        3, the nominal bolt material yield strength up to 1000 × 0.9 = 900MPa
Stainless steel screws