What’s the Grading of Mechanical Anchor? Are There Any Recommends?

  As the professional definition of the grading of mechanical anchor, Grade5.8, Grade 8.8 is often heard. What’s the real meaning of such grading?
  According to regulation of GB/T3098. 1-2000, anchor’s performance rate divides into Grade 4.8, 5.8, 6.8, 8.8, 10.9, 12.9. Grade 5.8 & 8.8 are widely used. Then what these performance rates stand for? How to choose a suitable mechanical anchor?
  Grade 6.8: standard value of its tensile strength is 600MPa, and yield strength is 480 MPa. Its elongation is less than 8%--the design specification of steel structure. Therefore, we do not recommend you to use it.
  As for Grade 10.9 & 12.9 mechanical anchor with high strength, after heat-treatment, it will possess high rigidity. Later corrosion prevention coating will increase the probability of hydrogen brittleness. Therefore, it’s also not our recommends.
  Grade 8.8: the standard value of tensile strength is 800 MPa, and yield strength is 640 MPa. Grade 8.8 anchor is the most used and the most cost-effective one.

‍                                                                                                                                                                               Editor: NJMKT
The copyright is reserved by www.nj-mkt.com. If reprint please indicate its source.