The meaning of bolts level of performance

The meaning of bolts level of performance

The meaning of bolts level of performance

    Steel connecting bolt performance levels more than 10 minutes 3.6,4.6,4.8,5.6,6.8,8.8,9.8,10.9,12.9 grades, including 8.8 and above or bolts made of low carbon alloy steel and heat treated carbon steel (quenching and tempering), commonly known as high strength bolts, the other known as ordinary bolts. Bolt performance rating label has two figures, namely that the nominal tensile strength of bolt material value and yield strength ratio. For example, the performance level of 4.6 of the bolt, which means:

a, bolt material tensile strength up to 400MPa nominal level;

b, bolt material yield strength ratio of 0.6;

c, the nominal bolt material yield strength up to 400 × 0.6 = 240MPa-class performance grade 10.9 high strength bolts, the material after heat treatment to achieve:

a, nominal tensile strength of bolt material up to 1000MPa level;

b, bolt material yield strength ratio of 0.9;

c, the nominal bolt material yield strength up to 1000 × 0.9 = 900MPa class

Bolt performance levels of meaning is an international standard, the same level of performance bolt, regardless of the difference between material and origin, its performance is the same design level of performance can only choose.

The so-called strength grade 8.8 and 10.9

Is the shear stress level bolts to 8.8GPa and 10.9Gpa