Comparison of Performance Grade Parameters of Hexagon Bolts

The performance grades of bolts for steel structure connection are 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, among which the bolts of grade 8.8 and above are made of low-carbon alloy steel or medium-carbon steel and are heat-treated (Quenching, tempering), commonly known as high-strength bolts, and the rest are commonly known as ordinary bolts. The bolt performance grade label consists of two parts of numbers, which respectively indicate the nominal tensile strength value and the yield ratio of the bolt material. The following is an example.

Bolts of performance class 4.6, its meaning is:

1. The nominal tensile strength of the bolt material is up to 400MPa; (Guide: What factors affect the quality of the screw connection)

2. The yield ratio of the bolt material is 0.6;

3. The nominal yield strength of the bolt material reaches 4000.6u003d240MPa

Performance grade 10.9 high-strength bolts, after heat treatment, the material can reach:

1. The nominal tensile strength of the bolt material reaches 1000MPa;

2. The yield ratio of the bolt material is 0.9;

3. The nominal yield strength of the bolt material reaches 10000.9u003d900MPa level

The meaning of bolt performance grade is an international standard. The performance of bolts of the same performance grade is the same regardless of the difference in material and origin. Only the performance grade can be selected in the design.

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