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Performance Ratings For Hexagon Bolts

- Aug 09, 2017 -

Steel structure Connection bolts-Performance grades 3.6, 4.6, 4.8, 5.6, 6.8, 8.8, 9.8, 10.9, 12.9 and so on 10 levels, of which 8.8 grade and above bolts material for low-carbon alloy steel or medium carbon and heat treatment (quenching, tempering), commonly known as high-strength bolts, the rest commonly known as ordinary bolts. The performance grade of bolts is composed of two parts, the nominal tensile strength value and yield ratio of the bolt material are respectively indicated. For example:

Performance level 4.6 bolts, meaning:

1. The nominal tensile strength of bolt material reaches 400MPa grade;

2. The ratio of bending strength of bolt material is 0.6;

3. The nominal yield strength of the bolt material is 400x0.6=240mpa Grade

Performance Grade 10.9 High-strength bolts, the material after heat treatment, can achieve:

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

2. The ratio of bending strength of bolt material is 0.9;

3. The nominal yield strength of the bolt material is 1000x0.9=900mpa Grade

The meaning of the bolt performance grade is the international standard, the same performance grade bolts, regardless of its material and the origin difference, its performance is the same, the design only chooses the performance grade to be able.

The strength level of the so-called 8.8 and 10.9 is that the shear stress level of the bolt is 8.8GPa and Ten. 9GPa

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