stainless steel bolt Level of knowledge

stainless steel bolt Level of knowledge

 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:

Performance rating 10.9 high strength bolts, the material after heat treatment to achieve:

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

2, bolt material yield strength ratio of 0.9;

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

Grade 4.6 bolt performance, its meaning is:

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

2, bolt material yield strength ratio of 0.6;

3, bolt nominal material yield strength up to 400 × 0.6 = 240MPa 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.

General bolt is "XY" said the intensity, X * 100 = the bolt tensile strength, X * 100 * (Y/10) = this bolt yield strength (as identified by the provisions of: the yield strength / tensile strength = Y/10), such as 4.8, this bolt tensile strength: 400MPa; yield strength: 400 * 8 / 10 = 320MPa.