Grade 12.9 High Strength bolts Staninless Steel Bolts M8 Sliver Color Light Blots

Bolts with performance class 4.6 are defined as:

1, the nominal tensile strength of the bolt material up to 400Mpa level;
2. The tensile strength ratio of the bolt material is 0.6;
3. Nominal yield strength of bolt material is 400×0.6= 240Mpa level

High strength bolts with performance class 10.9, the material of which after heat treatment can reach:

1. The nominal tensile strength of the bolt material reaches 1000Mpa level;
2. The tensile strength ratio of bolt material is 0.9;
3. Nominal yield strength of bolt material is 1000×0.9= 900Mpa level
The meaning of bolt performance grade is the international standard, the same performance grade of bolts, regardless of the difference between its material and origin, its performance is the same, the design can only choose the performance grade.

Bolts for steel structure connection can be divided into more than 10 grades, such as 3.6, 4.6, 4.8, 5.6, 6.8, 8.8, 9.8, 10.9, 12.9, etc., among which the bolts of 8.8 or above are made of low carbon alloy steel or medium carbon steel and subjected to heat treatment (quenching, tempering), which are generally called high strength bolts, and the rest are generally called ordinary bolts.The bolt performance grade label consists of two parts, which respectively represent the nominal tensile strength value and the yield strength ratio of the bolt material.