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What Does The Bolt Of Performance Grade 4.6 Mean?

- May 10, 2018 -

The hex bolts performance grade labels are composed of two parts, which respectively indicate the nominal tensile strength value and yield ratio of the bolt material. For example: a hex bolts with a performance rating of 4.6 means:
1. hex bolts material nominal tensile strength up to 400MPa;
2. The yield ratio of hex bolts material is 0.6;
3, the nominal yield strength of bolt material up to 400 × 0.6 = 240MPa level
Performance grade 10.9 high-strength bolts are heat treated to achieve:
1. The hex bolts material has a nominal tensile strength of 1000MPa;
2. The yield ratio of bolt material is 0.9;
3, the nominal yield strength of bolt material reaches 1000×0.9=900MPa grade
The meaning of the bolt performance level is an internationally accepted standard. Bolts of the same performance level have the same performance regardless of the difference between the material and the place of production. Only the performance level can be selected for the design.
Grades 8.8 and 10.9 for strength grades refer to bolts with shear stress ratings of 8.8 GPa and 10.9 GPa

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